WO2005091313A1 - 電子部品 - Google Patents
電子部品 Download PDFInfo
- Publication number
- WO2005091313A1 WO2005091313A1 PCT/JP2005/000760 JP2005000760W WO2005091313A1 WO 2005091313 A1 WO2005091313 A1 WO 2005091313A1 JP 2005000760 W JP2005000760 W JP 2005000760W WO 2005091313 A1 WO2005091313 A1 WO 2005091313A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- land
- electronic component
- conductive
- substrate
- lands
- Prior art date
Links
- 239000000758 substrate Substances 0.000 claims abstract description 95
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 23
- 229910052802 copper Inorganic materials 0.000 claims description 22
- 239000010949 copper Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 22
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 239000003989 dielectric material Substances 0.000 claims 2
- 239000000470 constituent Substances 0.000 abstract description 2
- 229910000679 solder Inorganic materials 0.000 description 71
- 239000006071 cream Substances 0.000 description 35
- 229910045601 alloy Inorganic materials 0.000 description 18
- 239000000956 alloy Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 239000011521 glass Substances 0.000 description 10
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 9
- 230000035939 shock Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 8
- 238000007650 screen-printing Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 239000003822 epoxy resin Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910017944 Ag—Cu Inorganic materials 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910001152 Bi alloy Inorganic materials 0.000 description 1
- 229910017932 Cu—Sb Inorganic materials 0.000 description 1
- 229910000846 In alloy Inorganic materials 0.000 description 1
- 229910020836 Sn-Ag Inorganic materials 0.000 description 1
- 229910020830 Sn-Bi Inorganic materials 0.000 description 1
- 229910020888 Sn-Cu Inorganic materials 0.000 description 1
- 229910020935 Sn-Sb Inorganic materials 0.000 description 1
- 229910020994 Sn-Zn Inorganic materials 0.000 description 1
- 229910020988 Sn—Ag Inorganic materials 0.000 description 1
- 229910018728 Sn—Bi Inorganic materials 0.000 description 1
- 229910019204 Sn—Cu Inorganic materials 0.000 description 1
- 229910008757 Sn—Sb Inorganic materials 0.000 description 1
- 229910009069 Sn—Zn Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- -1 containing copper Chemical compound 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920003217 poly(methylsilsesquioxane) Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/16—Resistor networks not otherwise provided for
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- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
- H01C1/144—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals or tapping points being welded or soldered
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C13/00—Resistors not provided for elsewhere
- H01C13/02—Structural combinations of resistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49811—Additional leads joined to the metallisation on the insulating substrate, e.g. pins, bumps, wires, flat leads
- H01L23/49816—Spherical bumps on the substrate for external connection, e.g. ball grid arrays [BGA]
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- H01L24/10—Bump connectors ; Manufacturing methods related thereto
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- H01L24/10—Bump connectors ; Manufacturing methods related thereto
- H01L24/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L24/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3431—Leadless components
- H05K3/3436—Leadless components having an array of bottom contacts, e.g. pad grid array or ball grid array components
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- H01L2224/13001—Core members of the bump connector
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
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- H05K2201/094—Array of pads or lands differing from one another, e.g. in size, pitch or thickness; Using different connections on the pads
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- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10045—Mounted network component having plural terminals
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10234—Metallic balls
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to an electronic component having, on one surface of a substrate, a plurality of circuit elements and external terminals of the circuit elements formed of conductive protrusions.
- US Patent No. 6,326,677 and International Publication WO97Z30461 disclose an electronic component having a plurality of circuit elements and external terminals of the circuit elements formed of conductive protrusions on one surface of a substrate. Has its disclosure.
- Japanese Patent Application Laid-Open No. 2003-031728 discloses a technique of providing enlarged lands at the four corners of the bottom surface of the IC chip 21 so that the IC chip 21 can withstand external force in a mounted state.
- Patent document 1 U.S. Pat.No. 6,326,677
- Patent Document 2 International Publication WO97Z30461
- Patent Document 3 JP-A-2003-031728
- the circuit elements and conductive projections are mounted with due consideration of the specificity of the structure.
- the structure must be able to withstand external forces, taking into account the arrangement with the land and the board area occupancy. Such external forces include mechanical stress (shock), thermal stress (shock) and the like.
- external forces include mechanical stress (shock), thermal stress (shock) and the like.
- the problem to be solved by the present invention is to provide an electronic component in which the area of one surface of a substrate is occupied by a plurality of circuit elements and conductive protrusions, to have a structure capable of withstanding an external force after mounting. It is.
- an electronic component of the present invention includes an electronic component having, on one surface of a substrate 1, a plurality of circuit elements and an external terminal of the circuit element including a conductive protrusion 9.
- a single circuit element includes a pair of electrodes 2 and a resistor 3 or a dielectric in contact with the electrodes 2, and the circuit elements are exposed while a part of the electrodes 2 is exposed as lands 4.
- the conductive protrusions 9 are covered with an overcoat 7 and include a fixing member, and are fixed to the lands 4 by the fixing member. At least three lands 4b of the lands 4 have a larger area than other lands 4a.
- the electronic component can stand alone with the conductive protrusion 9 in contact with the flat ground, and all the conductive protrusions 9 are substantially And conductive balls 10 of the same dimensions 4, characterized in that it is formed by the fixing of the whole surface.
- the land having the large area is referred to as "land 4b”
- the other land a normal land or a land having a small area
- the land 4a and the land 4b are collectively referred to as "land 4b”.
- Land 4 Land 4 ”.
- the "electronic component” includes a network resistor (for example, the one shown in FIG. 1) in which a plurality of resistance elements are connected by a common electrode 2b, or a resistance element and a capacitor connected together.
- a network resistor for example, the one shown in FIG. 1
- this includes the so-called multiple resistors and multiple capacitors in which multiple independent individual resistance elements or capacitors are arranged on one surface of a single substrate.
- these circuit elements are multilayered with a resin layer, a ceramic layer, or the like.
- the "substrate 1" is made of ceramic such as alumina or an epoxy resin molded body mixed with glass fiber.
- the ceramic is preferable because it has excellent rigidity as compared with other materials. The reason is that in an electronic component having a structure in which circuit elements are directly formed on the substrate 1, the deformation of the substrate 1 due to an external force tends to cause the resistance value and the capacitance value to deviate from the rated values. This is because it can be prevented as much as possible.
- the substrate 1 has rigidity, and the structure in which the circuit elements are directly arranged on the substrate 1 is different from the technology of the IC chip 21 (JP-A-2003-031728).
- the invention is essentially a technical idea Be different.
- the electronic component of the present invention has the conductive protrusions 9, an external force is easily applied to the conductive protrusions 9. Therefore, there is a possibility that the substrate 1 is curved and the resistance value and the capacitance value of each circuit element are likely to change. Therefore, the surface mount type electronic component does not have the conductive idea 9 and the technical idea. Differently.
- the first reason that "the one surface of the substrate 1 has an external terminal of the circuit element including the plurality of circuit elements and the conductive protrusions 9" has an advantage that manufacturing can be facilitated. That's why.
- Such adjustment involves difficulty because both sides of the substrate 1 cannot be viewed simultaneously.
- the second reason is that, as in an electronic component in which a land is disposed on one surface of the substrate 1 and another circuit element component is disposed on the other surface, an electronic device capable of increasing the entire land area to some extent. This is to clarify the distinction from parts.
- an electronic component in which lands and other circuit element components are arranged on one surface of the substrate 1 has an area that can occupy one surface of the substrate of the land 4 and that of other circuit element components. Limited by relationship.
- the "conductive protrusions 9" include a conductive ball 10 such as a V, a so-called solder ball 10 mounted and fixed on the land 4, a bump formed by a so-called subtractive method or an additive method, And the conductive paste is formed into a protruding shape by a method such as printing and solidified. Including.
- the “overcoat 7” may be a film made of a resin such as an epoxy resin, a glass film, or a film having two or more of these layers.
- the overcoat 7 forms the land 4 and covers the circuit element. Considering the ease of pattern jungling when forming a thick film, the entire area other than the land 4 may be covered.
- the opening diameter of the glass overcoat is smaller than the opening diameter of the resin overcoat. Is preferred. In such a configuration, when solder is used as a fixing member between the conductive ball 10 and the land 4, a glass overcoat mainly comes into direct contact with the molten solder.
- the glass can prevent the molten solder from entering the gap between the electrode forming the land 4 and the overcoat. If the molten solder is mainly in direct contact with the resin overcoat, the original role of the fixing member is sufficient because the molten solder relatively easily penetrates into the gap between the overcoat and the electrode constituting the land 4. It is considered that the solder may move to a position where it is difficult to exert the solder.
- the term "fixed to the land 4" mainly refers to fixing using solder as a fixing member. Since the surface of the land 4 and the conductive protrusions 9 are required to have a certain degree of good wettability with the solder, the solder exists over substantially the entire area of the land 4. Therefore, the conductive protrusion 9 fixed to the land 4b is fixed more firmly than the other conductive protrusions 9. This is because the amount of the solder supporting the conductive ball 10 is large and the area force fixed to the land 4b of the solder supported from the periphery of the conductive ball 10 is larger than that of the land 4a.
- the area of at least three lands 4b of the lands 4 is larger than the area of the lands 4a” means that the fixing force of the conductive protrusions 9 is increased, and the electronic component of the present invention is mounted on a circuit board of an electronic device or the like. This is because the structure is such that it can withstand external forces after being mounted by means of a terminus solder or the like.
- the following test has proved that the land 4b area is preferably about 1.4 times the land 4a area.
- whether or not the force area ratio is preferable is based on various assumptions (absolute values of the areas of the lands 4a and 4b, the degree of external force, etc.), and thus the force area ratio is not a constituent requirement.
- the electronic component be able to stand on its own when the conductive protrusion 9 is in contact with the flat ground when the conductive protrusion 9 is fixed only to the land 4b.
- This is for arranging the conductive protrusions 9 fixed to the substrate in a well-balanced state in the mounted state.
- self-supporting means that only the conductive protrusion 9 contacts the flat ground, and the substrate 1 can be supported without making contact with the flat ground. Due to this good balance, a structure that can withstand external forces from all directions after mounting can be obtained. For example, among the outer ends of the substrate 1 described later, the area of the lands 4 located at the four corners of the rectangular substrate 1 is increased. Whether or not the above-mentioned “independence is possible” is one indicator of whether or not the balance is good and the arrangement is good.
- All the conductive protrusions 9 are formed by bonding the conductive balls 10 having substantially the same dimensions to the entire surface of the lands 4", so that the conductive balls 10 arranged on the lands 4b are fixed to the fixing members. Will be widely supported. As a result, the effect of increasing the fixing force between the land 4b and the fixing member by the larger fixing area is obtained. Therefore, the bonding strength of the conductive ball 10 on the land 4b is increased, and an electronic component that can withstand external force when mounted on the circuit board 12 can be obtained, so that the problem to be solved by the present invention can be solved.
- the number of lands 4b is large.
- the land 4b preferably has a total number of lands 4 of approximately 1Z3 to 1Z2, and the area ratio of the entire land 4 to the substrate 1 is approximately 22 to 27%.
- the land 4b is preferably located at a position close to the outer end of the substrate 1. This is because, since an external force is easily applied to the outer end of the substrate 1, increasing the bonding strength between the conductive ball 10 and the land 4 at the outer end is considered to lead to more endurance of the external force.
- the conductive ball 10 and the entire surface of the land 4 are fixed with a fixing member in an amount substantially proportional to the area value of each land 4.
- the term "approximately proportional” means, for example, that when a fixing member such as cream solder is arranged on each land 4 by a normal screen printing technique, the opening area of the screen matches the area of each land 4. Means the relationship between the amount of fixing members and the area of land 4. That is, the word “abbreviated” is used to mean that the screen opening force of normal screen printing includes an error of the degree of variation in the amount of discharged material.
- the “conductive balls 10 having substantially the same dimensions” means that the diameter of each conductive ball 10 is within a certain error range.
- the ⁇ moderate error range '' is a degree of variation in the diameter of the conductive balls 10 that does not hinder the fixation of all the conductive balls 10 and the lands 13 of the circuit board when mounting the electronic components on the circuit board 12.
- the range is used for one electronic component.
- V, [maximum value / minimum value] / [average value] of the diameter of conductive balls 10 is approximately 5% or less
- the thickness of the conductive protrusion 9 arranged on the land 4b becomes larger than the thickness of the conductive protrusion 9 arranged on the land 4a. It is also possible (Figs. 5 and 6).
- the cause of the increase in the thickness can be caused by the deposition of the fixing member amount on the conductive ball 10 which is substantially proportional to the area value of each land 4.
- the term “deposition” includes, for example, that the cream solder 8 as a fixing member to the land 4 covers the surface of the conductive ball 10 having good solder wettability (for example, covered with a solder). Therefore, as described later, no special process is required to increase the thickness of the conductive protrusion 9 arranged on the land 4b.
- FIGS. 2 to 4 and 7 show a cream solder existing on an enlarged land (shown in FIG. 10 of the present application).
- Such cream It is considered that the formation of a pillar-shaped product by soldering as shown in FIG. 1 has a force and a complicated process that require a process not specified in the specification of the related art. The reason is that even if the cream solder is supplied to the normal land and the enlarged land by the same method (for example, screen printing), and the cream solder is melted and solidified, the columnar shape is formed on the enlarged land as shown in the figure.
- the conductive balls 10 having substantially the same dimensions and the entire surface of the land 4 are fixed with the fixing members in an amount substantially proportional to the area value of each land 4”.
- the conductive balls 10 mounted on the lands 4 can have the same dimensions regardless of the lands 4a and 4b, so that the mounting operation is not complicated.
- each land is fixed with a fixing member in an amount approximately proportional to the area value of each land, for example, in the case of the screen printing described above, it is sufficient if the opening area of the screen to be used is set to 4 large for each land. No special process such as adding cream solder 8 only to land 4b is required.
- a conductive ball 10 having a surface having excellent solder wettability is mounted on the land 4 on which the cream solder 8 is arranged, and the cream solder 8 is transferred to the conductive ball 10 through a reflow process or the like. It is deposited on the side.
- the conductive protrusions 9 fixed on the lands 4a have the solidified cream solder 11 deposited on the side surfaces of the conductive balls (for example, solder balls 10) as shown in FIG. ) On conductive ball 10 (Fig. 5 (b)). This difference is due to the difference in cream solder amount due to the difference in land 4 area.
- the maximum thickness of the conductive projection 9 fixed to the land 4b is about 1.2 times or more the maximum thickness of the conductive projection 9 fixed to the land 4a. It is proved by the test described below that it is suitable for a structure that can withstand the heat. However, determination of a suitable ratio of the force thickness requires various assumptions (for example, the absolute value of the maximum thickness of the conductive protrusion 9 and the degree of external force). I got it.
- the specialty of the structure of the electronic component in which the area of one surface of the substrate 1 is occupied by the plurality of circuit elements and the conductive protrusions 9 is sufficiently considered.
- 1 is a high V, rigid ceramic substrate 1.
- any one of the above-mentioned "land 4b" force, a rectangle, an ellipse, and a rectangle having rounded corners (hereinafter, referred to as a rectangle, etc.) It is preferable that the dimension in the long side direction of the substrate 1 in the Z or land 4b is larger than the dimension in the short side direction (FIGS. 2 (a) and 2 (b)). The reason why a quadrangle or the like is preferable is that the area of the land 4 can be increased.
- the amount of the cream solder 8 and the epoxy-based conductive adhesive which is approximately proportional to the land 4 area value, is sufficient to secure the conductive projection-shaped member 9.
- the quantity can be secured. If the amount of the strong fixing member is sufficient, the structure can withstand the external force after mounting.
- the reason that the land 4 area can be increased by making the shape of the land 4 into the above-described quadrilateral or the like is that a land 4 area can be secured outside the contour of the conventional circular land 4. That is This is because a square having one side having the same dimension as the diameter of the circular land 4 has a larger area of the land 4 by 4Z ⁇ times as large as the circle.
- the land 4 which is usually circular is replaced with, for example, all the lands of the electronic component in which the area of one surface of the substrate 1 is occupied by a plurality of circuit elements and the conductive protrusions 9 as shown in FIG.
- the reason why the long side dimension of the substrate 1 is preferably larger than the short side dimension is that the fixing member reinforces the substrate 1 along the long side direction.
- the substrate 1 is usually deformed along the long side direction by an external force.
- the reinforcement acts to suppress deformation of the substrate 1. Therefore, the electronic component having this structure has a structure that can withstand an external force after mounting, and can solve the problem to be solved by the present invention. Such an effect can be obtained even when the long side dimension of the substrate 1 is larger than the short side dimension in the lands 4b and Z or the land 4a.
- Square among the above squares and the like includes a rectangle, a square, a rhombus, a trapezoid, and a slightly modified shape thereof.
- the resistor 3 is formed on the substrate 1 and the electrode is directly provided on the resistor 3. More preferably, the electrode 2 on which the electrode 2 is formed constitutes the land 4b. This is because the land 4 can be formed in the electrode 2 region where the resistor 3 and the electrode 2 overlap, and a larger land 4b area can be secured. In a configuration that has been conventionally adopted in which the electrode 2 is formed on the substrate 1 and the resistor 3 is formed directly on the electrode 2, the resistor 3 and the electrode 2 overlap! Land 4 cannot be formed in electrode 2 region, or it is very difficult.
- the electronic component of the present invention and the electronic component having a preferable configuration based on the electronic component are resistors, a region where the electrode 2 extending from the land 4b and the resistor 3 overlap and are connected to each other. Is preferably present on a straight line connecting the shortest path between the center of the land 4b and the electrode 2 at the other end of the pair. This is because a distance in the current direction in a region where the electrode 2 and the resistor 3 overlap can be ensured. If the distance is not equal to or more than a certain value, when an excessive voltage is applied between the resistor element terminals, there arises a problem in maintaining the resistance element characteristics such as a change in the resistance value due to excessive Joule heat generation.
- the position of the end of the resistor 3 in the current direction is determined by setting the center of the land 4b and the other end of the pair.
- the resistor 3 can be arranged in some cases (eg, the positional relationship between the land 4b and the antibody 3 in FIGS. 1 (b) and 2 (b)).
- a resistance having the conductive protrusion 9 disposed on the paired land 4 including the land 4b as an external terminal is larger than the shortest distance of the paired lands 4.
- This configuration includes a case where both of the paired lands 4 are the lands 4b and a case where one of the paired lands 4 is formed on the common electrode 2b.
- the pair of the electrode 2 and the resistor 3 overlap.
- the distance between the overlapping areas can be maintained large, and the lands 4b can be arranged in a well-balanced manner. Therefore, in a resistor in which the area of one surface of the ceramic substrate 1 is occupied by the plurality of resistance elements and the conductive protrusions 9, a structure capable of withstanding an external force after mounting while maintaining predetermined resistance element characteristics. be able to.
- a substrate 1 region for insulating between adjacent resistive elements on the substrate 1 surface is excessively provided.
- the above-mentioned preferred configuration is making effective use of this area.
- the lands 4b are located at positions near both outer ends on the short side of the rectangular substrate 1.
- the thermal expansion and contraction rates of the circuit board 12 and the board 1 are reduced.
- the difference between the expansion rate and the contraction rate becomes the "external force”
- the relative position between the land of the board 1 at the time of mounting and the land 13 of the circuit board 12 (the portion of the circuit board 12 to which the conductive protrusions 9 of the electronic components are fixed). May shift.
- the displacement of the relative position exerted uniformly occurs over the entire area of the circuit board 1 and the circuit board 12, and thus becomes remarkable at a position apart from the center position of the circuit board 1.
- both ends in the long side direction are remarkable regions of misalignment. Therefore, by increasing the area of the land 4 on one surface of the substrate so that the region is firmly fixed to the circuit board 12, it is possible to obtain an electronic component structure that can withstand the above-mentioned "external force" most appropriately in the presence of the "external force". In addition, since it is not particularly required to increase the area of the other lands 4, it is possible to maintain predetermined circuit element characteristics.
- the land 4b has the conductive ball 10 holding means.
- the area of the land 4 is large, there is a concern that the fixed position of the conductive ball 10 disposed thereon is displaced.
- the land 4b has a square shape or the like, the conductive property caused by the surface tension of the molten solder when the solder is used as a fixing member between the land 4b and the conductive ball 10 is larger than the case where the land 4b is circular. It may be difficult to expect the position correction effect of the sex ball 10.
- a protruding member capable of holding the ball 10 is previously arranged on one surface of the substrate under a conductive film such as a metal glaze-based material constituting the land 4b. It is a means. According to the brute force means, the projecting member 14 exists so as to protrude the conductive film, and has an effect of holding the ball 10 on the conductive film even after the formation of the conductive film. Protrusion The arrangement of the shaped members 14 on the one surface of the substrate is performed by screen printing of a paste of, for example, glass resin (FIG. 9).
- the present invention is particularly useful when the conductive projections 9 do not substantially contain lead.
- the conductive projections 9 containing lead mainly a low melting point alloy such as solder
- the conductive projections 9 containing substantially no lead have a lower rigidity than the conductive projections 9 containing substantially no lead and have a function as a cushioning material against external force.
- the conductive projections 9 containing no lead are inferior in function as a strong cushioning material, so that the influence of external force is relatively large.
- the conductive projections 9 are made of a low-melting metal that does not contain lead, for example, Sn alone, Sn-Bi alloy, Sn-In-Ag. Alloy, Sn-Bi-Zn alloy, Sn-Zn alloy, Sn-Ag-Bi alloy, Sn-Bi-Ag-Cu alloy, Sn-Ag-Cu alloy, Sn-Ag-In alloy Alloys, Sn—Ag—Cu—Sb alloys, Sn—Ag alloys, Sn—Cu alloys, and Sn—Sb alloys are also selected. This is true for both the cream solder 8 and the conductive balls 10 described above.
- all the resistors 3 constituting the electronic component have substantially the same shape, and the space between the adjacent resistors 3 is substantially the same. More preferably, the distances are substantially the same.
- Joule heat is generated at the three resistive elements. This is not a problem if the Joule heat has little effect on the characteristics of the small resistance element (eg, resistance temperature characteristics (TCR)).
- TCR resistance temperature characteristics
- Joule heat is generated to an extent that affects the TCR and local heat concentration occurs due to the arrangement of the resistor 3 of the electronic component, the difference in characteristics of the respective resistive elements becomes remarkable. In some cases. This is because it is effective in preventing strong local heat concentration. For example, by arranging the electrode 2 and the resistor 3 shown in FIG. 1B, the heat concentration can be prevented.
- the conductive protrusion 9 be mainly composed of copper. Copper has a very high thermal conductivity compared to solder, etc.Simple mounting of Joule heat generated by a resistor element can be quickly dissipated to the circuit board 12, so the provision of a resistor 3 where Joule heat can be locally concentrated temporarily This is because the resistance element characteristics can be stabilized.
- Copper has a higher thermal expansion than conventionally used solder (for example, 37Pb-63Sn alloy). The rate is as small as about 2Z3. Therefore, even if the substrate 1 is fixed to the land 4 and then exposed to an environment in which heating and cooling are repeated, there is little risk of separation from the land 4.
- solder for example, 37Pb-63Sn alloy
- copper is very harder than solder, so it becomes conductive protrusions 9 and has almost no deformation due to handling when balls 10 are formed. This is advantageous for keeping the constant.
- a conductive coating layer such as Ni or Sn plating is formed on the surface of the copper. This is for improving the solder wettability of the conductive projections 9 and for preventing oxidation of the copper surface. If the copper surface is oxidized, it is difficult to alloy with the solder at the time of mounting on the mounting plate, and it is difficult to obtain a proper bonding state with the mounting plate and the land 4.
- the above-mentioned copper-based alloy has a solder layer made of pure Sn or an alloy containing Sn on the surface of pure copper or an alloy mainly containing copper, or an alloy mainly containing copper or copper. It is formed by such a method.
- gold can be used instead of the copper.
- the advantages of using gold are that it does not necessarily require an antioxidation layer on the surface and has the same or higher flexibility as solder, so it functions as a cushioning material against external forces with low rigidity. Therefore, the deterioration of the fixed state between the conductive projection 9 and the land 4 due to the influence of external force is small.
- the area is large, the land 4b is made of a metal glaze-based material, and the entire surface of the land 4b is covered with a fixing member. It is preferable (FIG. 5 (b)).
- the metal glaze-based material is firmly fixed to one surface of the ceramic substrate, which also has a strength such as alumina.
- This adhesive force is usually larger than the adhesive force of the copper foil formed (fixed) on the so-called glass fiber-containing epoxy resin-based substrate surface.
- the difference in the fixing force increases as the surrounding environment becomes higher in temperature. This is because metal glaze-based materials and ceramics have high heat resistance.
- the fixing member is provided on the entire surface of the land 4b, the fixing force between the conductive protrusion 9 and the surface of the land 4b is also ensured. Therefore, even if an external force is applied to the conductive projections 9 in a state where the conductive projections 9 are fixed, peeling of the interface between the substrate 1 and the lands 4b can be effectively suppressed.
- the land 4b not only the land 4b but also the land 4a has a metal glaze-based material strength, and it is more preferable that the entire surface of the land 4a is covered with the fixing member.
- land 4b is larger in area than land 4a. Therefore, the effect of increasing the fixing strength by covering the entire surface with the fixing member is greater.
- a conductive adhesive can be used in place of the metal glaze.
- a conductive adhesive mainly composed of an epoxy-based resin or an acrylic resin can be firmly fixed to one surface of a substrate, such as alumina, which also has a ceramic equivalent force, as well as the metal glaze-based material. That's why.
- the electronic component occupying the area of one surface of the substrate 1 with the plurality of circuit elements and the conductive protrusions 9 can have a structure capable of withstanding an external force after mounting. did it.
- FIG. 1 is a view showing a positional relationship between electrodes, resistors, and lands of a network resistor according to the present invention.
- the lands 4a and 4b show the contours of the regions that become lands after the subsequent steps.
- FIG. 2 is a diagram showing a positional relationship between electrodes, resistors, and lands of another network resistor according to the present invention.
- the lands 4a and 4b illustrate the contours of the regions that become lands after the subsequent steps.
- FIG. 3 is a view showing a process of manufacturing the network resistor according to the present invention.
- FIG. 4 is a view showing a process of manufacturing another network resistor according to the present invention.
- FIG. 5 In the network resistor according to the present invention, (a) is a schematic longitudinal sectional view of a normal land.
- (B) is a diagram showing a schematic longitudinal sectional view of a land having a large area.
- FIG. 6 (a) is a schematic longitudinal cross-sectional view of a normal land and a conductive protrusion when the network resistor according to the present invention is mounted on a circuit board, and (b) is a land and a conductive protrusion having a large area. It is a figure which shows the longitudinal cross-section schematic diagram of FIG.
- FIG. 7 In the network resistor according to the present invention, (a) is a schematic longitudinal sectional view of a normal land, (b) is a schematic longitudinal sectional view of a land having a large area, and (c) is a network resistance according to the present invention.
- FIG. 3D is a schematic cross-sectional view of a normal land and conductive protrusions when the device is mounted on a circuit board, and FIG. 4D shows a large area, land, and ground when the network resistor according to the present invention is mounted on the circuit board. It is a figure showing the longitudinal section outline figure of a conductive projection.
- FIG. 8 (a) shows a state before performing a thermal shock test on the network resistor according to the present invention.
- FIG. 4 is a schematic diagram showing a side surface state on the long side of the substrate.
- B is a schematic diagram showing a side surface state on the long side of the substrate at the time of cooling in the thermal shock application test.
- C is a schematic diagram showing a side surface state on the long side of the substrate during heating in a thermal shock application test.
- FIG. 9 is a view showing a state where a part of a land 4b according to the present invention is raised to hold a conductive ball.
- FIG. 10 is a schematic diagram showing a state in which a conventional IC chip is mounted on a circuit board.
- a metal glaze-based Ag-Pd-based conductive paste is screen-printed on the substrate 1 shown in Fig. 3 (a), and then fired, and a part of the paste is used as a land for connecting a terminal of a resistor element.
- An individual electrode 2a and a common electrode 2b are obtained (FIG. 3 (a)).
- the left and right end forces on which the lands 4b are formed later also have the shape of the two individual electrodes 2a. It is assumed that the resistor 3 can be avoided.
- the common electrode 2b and the individual electrode 2a form a pair of electrodes 2, and a metal glaze-based resistor paste containing ruthenium oxide and glass frit as main components is screen-printed so as to be in contact with both electrodes. Then, firing is performed to obtain a resistor 3 (FIG. 3 (b)). Thus, a resistance element is obtained. Next, a glass paste is screen-printed so as to cover the resistor 3 and then fired to obtain a glass 5 (FIG. 3 (c)). As shown in the figure, the resistor 3 formed between the individual electrode 2a on which the land 4b is formed later and the common electrode 2b at the other end of the land 4b is a straight line connecting the shortest paths between the electrodes 2. The resistor 3 is formed avoiding the upper part.
- a step of forming a trimming groove 6 in the resistor 3 by laser irradiation and adjusting the resistance value is performed (FIG. 3D).
- the glass 5 acts to minimize damage to the entire resistor 3.
- an epoxy resin-based paste is screen-printed, and then the paste is cured by heating (FIG. 3 (e)).
- a necessary part of the land 4 in the individual electrode 2 a and the common electrode 2 b is exposed.
- the lands 4b on the individual electrode 2a and the common electrode 2b at two positions from the left and right ends of the substrate 1 are approximately 1.4 times the lands 4a.
- a cream solder 8 made of a commercially available Sn-Ag-Cu-based alloy is arranged on these four lands by screen printing using a metal mask having openings substantially corresponding to the area values of the four lands. (Fig. 3 (f)). At this time, the cream solder 8 was spread over the entire area of each land 4, and the amount of cream solder 8 as a fixing member in proportion to the area of the land 4 was supplied to each of the lands 4.
- a commercially available ball 10 of pure copper (the surface of which is coated with Sn plating), which is a conductive ball 10, is mounted on the cream solder 8 portion.
- the substrate 1 is held for a predetermined time together with the resistive element and the pure copper ball 10, that is, a so-called reflow process is performed to fix the land 4 to the pure copper ball 10. 'Connect.
- a part of the pure copper ball 10 is melted and re-solidified together with the cream solder 8 to form the “conductive protrusion 9” mainly composed of pure copper.
- the pure copper ball 10 was moved to the center of each land 4 at the melting stage of the cream solder 8. This is due to the surface tension of the melted cream solder 8.
- the electronic component of the present invention can be obtained. Thereafter, when a stress is applied along the dividing groove provided in the substrate 1 to divide the substrate, individual first network resistors according to the present invention can be obtained.
- the second network resistor may be configured such that the land 4b is rectangular or the like, and that the Z or the land 4b has a longer side dimension force than the shorter side dimension of the substrate 1.
- the steps (a) to (f) shown in FIG. 4 are manufactured in this order in substantially the same manner as the above-described first network resistor according to the present invention.
- the points different from or added to the manufacturing of the first network resistor according to the present invention described above are as follows.
- the size of the individual electrode film 2a along the long side direction of the substrate 1 is larger than the size of the individual electrode film 2a along the short side direction.
- the shape of the land 4 exposed when the overcoat film 7 is disposed is a shape having rounded corners at four corners of a rectangle. It was.
- FIG. 5A and FIG. 7A show the fixed state of the land 4a and the conductive ball 10.
- FIG. FIGS. 5 (b) and 7 (b) show a fixed state between the land 4b and the conductive ball 10.
- FIG. FIGS. 5 (a) and 5 (b) show a state in which the cream solder adheres to substantially the entire area of the conductive ball 10 (the solder is wet).
- FIGS. 7A and 7B show a state in which the cream solder adheres only to the vicinity of the land 4 of the conductive ball 10. In the manufactured network resistors, both those shown in Figs. 5 (a) and (b) and those shown in Figs. 7 (a) and (b) were observed.
- the amount of solidified cream solder 11 adhered to the land 4b is larger than that of the land 4a.
- the area force that the solidified terminal solder 11 supported from the surroundings is fixed to the land 4b is larger than that of the land 4a.
- the ball 10 arranged on the land 4b was widely supported by a large amount of fixing members.
- the conductive protrusion 9 fixed to the land 4b had a maximum thickness approximately 1.2 times that of the conductive protrusion 9 fixed to the land 4a. I was strong.
- the major factor that determines the fixing strength is that the conductive protrusion 9 does not depend on the thickness of the conductive protrusion 9. It can be inferred that the area is the fixed area between the conductive ball 10 and the land 4.
- the first and second network resistors were surface-mounted on a circuit board (mounting board) 12, which was an epoxy resin molded body mixed with glass fiber.
- a circuit board mounting board 12
- the same cream solder as the above-mentioned cream solder is screen-printed on the land 13 of the circuit board, and each conductive protrusion 9 of the first and second network resistors is placed at the position of the land 13 of the circuit board. And subjected to the same reflow process as above. This resulted in the mounting state shown in Fig. 6 or Fig. 7 (c) and (d).
- the adhesion state of the conductive projections 9 to the lands 4 does not change in appearance, and the fixing strength also does not change.
- the network resistor not according to the present invention in which all the lands 4 had a normal area (land 4a), a slight deformation was observed in the appearance of the conductive projections 9 fixed to the lands 4 in appearance.
- the conductive projection 9 was peeled off from the land 4a corresponding to the position where the land 4b in FIG. 1 (a) was arranged. This is presumably because a large stress was applied to the fixed portion between the land 4a and the conductive projection 9 as approaching the outer edge of the substrate 1 in the long side direction.
- a force using a fired product of a metal-glaze-based material or another material can be used as the material of the land 4.
- a copper foil material, a conductive adhesive, or the like which is disposed on the surface of the circuit board 12 and is puttered.
- the present invention is particularly advantageous when a metal glaze-based material or a conductive adhesive is used as the material of the land 4 and solder is used as a fixing member with the conductive ball 10.
- metal glaze-based materials or conductive adhesives generally have poor solder wettability, so their bonding strength is lower than when other land 4 materials are used. The effect of increasing the bonding strength of land 4b is greater.
- the ball 10 is made of pure copper.
- a solder ball made of Sn-3Ag-0.5Cu or a solder ball having a different composition can be used.
- resin core balls For! / You can.
- the manufacturing process of the first and second network resistors shown in FIGS. 3 and 4 can be similarly applied to the network resistor shown in FIGS. 1 (b) and 2 (b). Needless to say.
- the advantage of the network resistor due to the arrangement of the elements shown in FIGS. 1B and 2B is prevention of heat concentration as described above.
- the first advantage of the network resistor due to the arrangement of Fig. 1 (a) and Fig. 2 (a) is that the external dimensions of the resistor are slightly smaller than those of Figs. L (b) and 2 (b). It is possible.
- the second advantage is that the shape of the individual electrode 2b on which the land 4a having a small area is formed can be simplified as compared with the cases of FIGS. 1 (b) and 2 (b).
- the strong electrode 2b is formed as a thick film by screen printing or the like, it is particularly preferable because the shape variation can be reduced. This is particularly advantageous as the size of electronic components is reduced.
- the present invention has a possibility of being used in an electronic component-related industry such as a network resistor having a plurality of circuit elements and an external terminal of the circuit element having a conductive protrusion force on one surface of a substrate. .
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Details Of Resistors (AREA)
- Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/593,535 US20080303149A1 (en) | 2004-03-24 | 2005-01-21 | Electronic Component |
JP2006511132A JP4568719B2 (ja) | 2004-03-24 | 2005-01-21 | 電子部品 |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004086573 | 2004-03-24 | ||
JP2004-086573 | 2004-03-24 | ||
JP2004-179092 | 2004-06-17 | ||
JP2004179092 | 2004-06-17 | ||
JP2004-224064 | 2004-07-30 | ||
JP2004224064 | 2004-07-30 |
Publications (1)
Publication Number | Publication Date |
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WO2005091313A1 true WO2005091313A1 (ja) | 2005-09-29 |
Family
ID=34993953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/000760 WO2005091313A1 (ja) | 2004-03-24 | 2005-01-21 | 電子部品 |
Country Status (3)
Country | Link |
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US (1) | US20080303149A1 (ja) |
JP (1) | JP4568719B2 (ja) |
WO (1) | WO2005091313A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005311271A (ja) * | 2004-03-24 | 2005-11-04 | Minowa Koa Inc | ネットワーク抵抗器 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120161312A1 (en) * | 2010-12-23 | 2012-06-28 | Hossain Md Altaf | Non-solder metal bumps to reduce package height |
Citations (5)
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JPH0722213A (ja) * | 1993-07-06 | 1995-01-24 | Matsushita Electric Ind Co Ltd | 面実装部品への半田バンプ形成方法 |
JPH08139233A (ja) * | 1994-11-08 | 1996-05-31 | Matsushita Electric Ind Co Ltd | モジュール部品 |
JPH0946045A (ja) * | 1995-07-26 | 1997-02-14 | Oki Electric Ind Co Ltd | 多層配線基板の製造方法 |
JP2000058709A (ja) * | 1998-08-17 | 2000-02-25 | Nec Corp | 突起電極構造および突起電極形成方法 |
JP2000077218A (ja) * | 1998-09-01 | 2000-03-14 | Matsushita Electric Ind Co Ltd | チップ形抵抗ネットワーク |
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US5172471A (en) * | 1991-06-21 | 1992-12-22 | Vlsi Technology, Inc. | Method of providing power to an integrated circuit |
US6326677B1 (en) * | 1998-09-04 | 2001-12-04 | Cts Corporation | Ball grid array resistor network |
JP2000100851A (ja) * | 1998-09-25 | 2000-04-07 | Sony Corp | 半導体部品及びその製造方法、半導体部品の実装構造及びその実装方法 |
US6444563B1 (en) * | 1999-02-22 | 2002-09-03 | Motorlla, Inc. | Method and apparatus for extending fatigue life of solder joints in a semiconductor device |
JP3490987B2 (ja) * | 2001-07-19 | 2004-01-26 | 沖電気工業株式会社 | 半導体パッケージおよびその製造方法 |
JP2003234433A (ja) * | 2001-10-01 | 2003-08-22 | Matsushita Electric Ind Co Ltd | 半導体装置、半導体装置の実装方法、ならびに実装体およびその製造方法 |
US6856516B2 (en) * | 2002-08-20 | 2005-02-15 | Cts Corporation | Ball grid array resistor capacitor network |
US6780751B2 (en) * | 2002-10-09 | 2004-08-24 | Freescale Semiconductor, Inc. | Method for eliminating voiding in plated solder |
US7070088B2 (en) * | 2004-03-09 | 2006-07-04 | Texas Instruments Incorporated | Method of semiconductor device assembly including fatigue-resistant ternary solder alloy |
-
2005
- 2005-01-21 US US10/593,535 patent/US20080303149A1/en not_active Abandoned
- 2005-01-21 JP JP2006511132A patent/JP4568719B2/ja not_active Expired - Fee Related
- 2005-01-21 WO PCT/JP2005/000760 patent/WO2005091313A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0722213A (ja) * | 1993-07-06 | 1995-01-24 | Matsushita Electric Ind Co Ltd | 面実装部品への半田バンプ形成方法 |
JPH08139233A (ja) * | 1994-11-08 | 1996-05-31 | Matsushita Electric Ind Co Ltd | モジュール部品 |
JPH0946045A (ja) * | 1995-07-26 | 1997-02-14 | Oki Electric Ind Co Ltd | 多層配線基板の製造方法 |
JP2000058709A (ja) * | 1998-08-17 | 2000-02-25 | Nec Corp | 突起電極構造および突起電極形成方法 |
JP2000077218A (ja) * | 1998-09-01 | 2000-03-14 | Matsushita Electric Ind Co Ltd | チップ形抵抗ネットワーク |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005311271A (ja) * | 2004-03-24 | 2005-11-04 | Minowa Koa Inc | ネットワーク抵抗器 |
JP4508737B2 (ja) * | 2004-03-24 | 2010-07-21 | コーア株式会社 | ネットワーク抵抗器 |
Also Published As
Publication number | Publication date |
---|---|
US20080303149A1 (en) | 2008-12-11 |
JP4568719B2 (ja) | 2010-10-27 |
JPWO2005091313A1 (ja) | 2008-02-07 |
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