DE1764619C3 - transistor - Google Patents
transistorInfo
- Publication number
- DE1764619C3 DE1764619C3 DE1764619A DE1764619A DE1764619C3 DE 1764619 C3 DE1764619 C3 DE 1764619C3 DE 1764619 A DE1764619 A DE 1764619A DE 1764619 A DE1764619 A DE 1764619A DE 1764619 C3 DE1764619 C3 DE 1764619C3
- Authority
- DE
- Germany
- Prior art keywords
- base
- zone
- insulating film
- emitter
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002184 metal Substances 0.000 claims description 34
- 239000004065 semiconductor Substances 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000011109 contamination Methods 0.000 claims 1
- 230000001681 protective effect Effects 0.000 claims 1
- 239000005368 silicate glass Substances 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 229910000679 solder Inorganic materials 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/731—Location prior to the connecting process
- H01L2224/73101—Location prior to the connecting process on the same surface
- H01L2224/73103—Bump and layer connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
- H01L2224/8119—Arrangement of the bump connectors prior to mounting
- H01L2224/81191—Arrangement of the bump connectors prior to mounting wherein the bump connectors are disposed only on the semiconductor or solid-state body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
- H01L2224/818—Bonding techniques
- H01L2224/81801—Soldering or alloying
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/8319—Arrangement of the layer connectors prior to mounting
- H01L2224/83191—Arrangement of the layer connectors prior to mounting wherein the layer connectors are disposed only on the semiconductor or solid-state body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01013—Aluminum [Al]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01033—Arsenic [As]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01079—Gold [Au]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01082—Lead [Pb]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/013—Alloys
- H01L2924/014—Solder alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1203—Rectifying Diode
- H01L2924/12036—PN diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/14—Integrated circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/19—Details of hybrid assemblies other than the semiconductor or other solid state devices to be connected
- H01L2924/1901—Structure
- H01L2924/1904—Component type
- H01L2924/19043—Component type being a resistor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3025—Electromagnetic shielding
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Bipolar Transistors (AREA)
Description
3 * 43 * 4
als Isolierschiebt 9 von einigen oder einigen zehn μπι gungskonzentration und einer hochohmigen Epitaxial-Dicke verwendet. Die Glasschicht 9 wird an den den schicht 23. eine P-Typ-Basiszone 24, eine N -Typ-Metallschichten 7 und 8 entsprechenden Stellen per- Emitterzone 25, eine die Oberfläche des Grundforiert Durch diese Löcher werden Metallschichten körpers bedeckende erste Isolierschicht 27, Kollek-as insulating slide 9 of a few or a few tens of μπι supply concentration and a high-resistance epitaxial thickness used. The glass layer 9 is attached to the layer 23, a P-type base zone 24, an N -type metal layers 7 and 8 corresponding points per emitter zone 25, one perforating the surface of the base Through these holes metal layers are body-covering first insulating layer 27, collector
10 und 11 angebracht Gleichzeitig wird eine Metall- 5 tor-. Basis- und Emitterelektroden 28,29 und 30 in schicht 12 mit einer gegenüber der Basisdiffusions- Verbindung mit der Zone 26 bzw. der Basiszone 24 schicht 4 größeren Fläche zur völligen Bedeckung bzw. der Emitterzone 25, einen zur Bedeckung der der Basiszone erzeugt Die Metallschicht 22 kann Elektroden 28,29 und 30 und der Isolierschicht 27 nicht nur auf der wirksamen Betriebszone, bestehend erzeugten zweiten Isolierfilm 31, Metallschichten 32. aus der basiszone 4 und der Emitterzone 5, sondern io 33 und 34 (34 ist nicht dargestellt) in Verbindung auch auf der übrigen Oberfläche des Isolierfilms 9 mit den Elektroden 28, 29 und 30, eine auf dem mit Ausnahme des Teils, wo die Elektroden 10 und Isolierfilm 31 zur Bedeckung des Hauptteils, d. h.10 and 11 attached at the same time a metal 5 gate. Base and emitter electrodes 28, 29 and 30 in layer 12 with a connection opposite the base diffusion connection with the zone 26 or the base zone 24 layer 4 larger area to completely cover or the emitter zone 25, one to cover the The metal layer 22 can have electrodes 28, 29 and 30 and the insulating layer 27 not only on the effective operating zone, consisting of the produced second insulating film 31, metal layers 32. from the base zone 4 and the emitter zone 5, but rather IO 33 and 34 (34 is not shown) in connection also on the remaining surface of the insulating film 9 with the electrodes 28, 29 and 30, one on the except for the part where the electrodes 10 and insulating film 31 to cover the main part, i.e. H.
11 angebracht sind, erzeugt werden. des wirksamen Betriebsteils des Schaltungselements, Beim vorstehend erläuterten Transistoraufbau wird gebildete zweite Metallschicht 35 und Lötschichten11 are attached, are generated. the effective operating part of the circuit element, In the transistor structure explained above, the second metal layer 35 and solder layers are formed
wenigstens der Hauptteil oder die wirksame Betriebs- is 36, 37, 38 (38 ist nicht dargestellt) und 39 auf den zone, die die Emitterzone 5 und die Basiszone 4 so- Metallschichten 32, 33, 34 und 35 umfaßt. Dieses wie die PN-Übergänge zwischen dem Emitter und Ausführungsbeispiel unterscheidet sich von dem vorder Basis und zwischen der Basis uni dem Kollektor hergehenden dadurch, daß die Kollektorelektrode, umfaßt, durch die Metallschicht 12 vollkommen vor die Basiselektrode und die Emitterelektrode an derder äußeren Atmosphäre geschützt. Selbst wenn der ao selben Oberfläche freiliegen.at least the main part or the effective operating is 36, 37, 38 (38 is not shown) and 39 on the zone comprising the emitter zone 5 and the base zone 4 so-metal layers 32, 33, 34 and 35. This, like the PN junctions between the emitter and the embodiment, differs from the front base and between the base and the collector in that the collector electrode is completely protected from the base electrode and the emitter electrode from the outside atmosphere by the metal layer 12. Even if the same surface is exposed.
Isolierfilm 9 mehr oder weniger hygroskopische Das Halbleiterbauelement 21 mit einem solchen Eigenschaften aufweist kann eine Verschlechterung Aufhau ist auf einem gedruckten Schaltungsder Betriebseigenschaft des Transistors verhindert grundkörper 40 angeordnet der vorher hergestellt werden, da die Oberfläche des Isolierfilms von der wurde, so daß die Verbindungsdrahtschichten 42, 43, äußeren Atmosphäre isoliert ist und die durch- as 44 (44 ist nicht dargestellt) und 45 die Lötschichten wandernde Feuchtigkeit kaum berührt. Wenn weiter 36, 37, 38 und 39 berühren. In diesem Ausführungsdie Metallschicht 12 z.B. gemäß Fig. 1 mit Erde beispiel ist der gedruckte Grundkörper mit einer verbunden wird, werden alle an der Oberfläche Metallzone 46 hoher Wärmeleitfähigkeit versehen, haftenden Ladungen ohne Beeinflussung der Halb- die eine Isolierplatte 41 durchdringt und mit einer leiteroberfläche abgeleitet. Selbst wenn das Bau- 30 leitenden Schicht 45 verbunden ist. Diese Metallelement einem hohen elektrischen Feld ausgesetzt schicht 46 dient zur Abstrahlung der innerhalb des wird, ist der den Emitter-Basis-Übergang und den Halbleiterbauelements erzeugten Wärme. Wenn die Basis-Kollektor-Übergang enthaltende Hauptteil noch Metallzone 46 in Berührung mit einer Strahlungsdurch die geerdete Metallschicht 12 abgeschirmt. platte gebracht ist, wird der Abstrahlungseffekt Obwohl vom theoretischen Gesichtspunkt aus die 35 weiter verbessert. Der Transistor 21 kann am Grund-Metallschichten 7,8,10 und 11 aus irgendeinem körper 40 mit einer großen mechanischen Festigkeit Material, welches in der Halbleiterindustrie ver- einfach und sicher angebracht werden. Der wirksame wendet wird, erzeugt werden können, zieht man im Betriebsteil des Halbleiterbauteils ist vollkommen Hinblick auf die Berührung mit Wasser ein inaktives durch die Metallschichten 35 und 39 geschützt. Metall vor. Die Isolierschichten 6 und 9 können statt 40 Durch Verbindung der Metallschicht 45 mit Erde der Siliziumoxidschicht oder der Glasschicht aus kann der Einfluß elektrischer Ladungen an der Siliziumnitrid gebildet werden. Oberfläche des Bauteils vermieden werden.Insulating film 9 more or less hygroscopic The semiconductor component 21 with such Properties may deteriorate build-up on a printed circuit board Operating characteristic of the transistor prevents the base body 40 from being arranged previously made because the surface of the insulating film has become so that the connecting wire layers 42, 43, external atmosphere is isolated and the through-as 44 (44 is not shown) and 45 the solder layers hardly touched migrating moisture. If further touch 36, 37, 38 and 39. In this embodiment the Metal layer 12 e.g. according to Fig. 1 with earth example is the printed base body with a is connected, all metal zones 46 of high thermal conductivity are provided on the surface, Adhering charges without affecting the half which penetrates an insulating plate 41 and with a conductor surface derived. Even if the component 30 conductive layer 45 is connected. This metal element exposed to a high electric field layer 46 is used to radiate within the is the heat generated by the emitter-base junction and the semiconductor device. If the The main part containing the base-collector junction still has metal zone 46 in contact with a radiation penetration the grounded metal layer 12 is shielded. plate is brought, the radiation effect Although from a theoretical point of view the 35 is further improved. The transistor 21 can on the base metal layers 7,8,10 and 11 of any body 40 with a great mechanical strength Material that can be applied easily and safely in the semiconductor industry. The effective one is applied, can be generated, one pulls in the operating part of the semiconductor component is perfect With regard to contact with water, an inactive one is protected by the metal layers 35 and 39. Metal in front. The insulating layers 6 and 9 can instead of 40 By connecting the metal layer 45 to earth the silicon oxide layer or the glass layer can be the influence of electrical charges on the Silicon nitride are formed. Surface of the component can be avoided.
F i g. 2 zeigt ein anderes Ausführungsbeispiel des Hierbei ist es vorteilhaft daß die Metallschicht 35 Transistors nach der Erfindung, in welchem das völlig die freiliegende Endzone des Kollektor-Basis-Halbleiterbauelement einen Halbleitergrundkörper 21 45 Übergangs bedeckt und sich auch über die Kollektoreinschließlich einer N+-Schicht 22 hoher Verunreini- oberfläche erstreckt.F i g. 2 shows another embodiment of the transistor according to the invention, in which the completely exposed end zone of the collector-base semiconductor component covers a semiconductor base body 21 45 transition and also extends over the collector including an N + layer 22 high impurity surface extends.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (1)
bildenden Halbleiterkörper eines ersten Leitungs- 5 Der Erfindung liegt die Aufgabe zugrunde, einen typs, in dem eine Basiszone eines zweiten Transistor der eingangs genannten Art so auszu-Leitungstyps und innerhalb der Basiszone eine bilden, daß er mittels des zweiten Isolierfilms und Emitterzone des ersten Leitungstyps mit jeweils der zweiten Metallschicht wirksamer gegen atmoeinem an einer Oberflächenseite des Halbleiter- sphärische Verunreinigungen geschützt ist, eine verkörpere hervortretenden PN-Übergang gebildet io besserte Wärmeabstrahleigenschaft aufweist und einsind, mit einem die genannte Oberflächenseite fächer gestaltet istTransistor is polarized with a sense opposite to a collector zone,
forming semiconductor body of a first conduction 5 The invention is based on the object of a type in which a base zone of a second transistor of the type mentioned at the outset and form a conduction type within the base zone that it can be formed by means of the second insulating film and emitter zone of the first conduction type each with the second metal layer is more effectively protected against atmospheric contamination on a surface side of the semiconductor, an embodied protruding PN junction is formed and has better heat radiation properties and is one with which said surface side is designed to be fan-shaped
deckenden zweiten Metallschicht, dadurch Durch die von der Basis- und Emitterelektrode ge-This insulating film in the form of a first metal dissolves that the base and emitter applied to the second insulating film are separated from the electrode, with a first insulating film and 15 base and emitter electrodes covering the base and the electrodes second insulating film emitter zone including the ends placed on one upper side and one on the second insulating film on the surface side of the semiconductor body, completely covering the base and emitter zone above the PN junctions,
covering second metal layer, due to the fact that the base and emitter electrodes
mit jeweils einem an einer Oberflächenseite des Die Erfindung wird an Hand einiger in der Zeich-The invention relates to a transistor base junction which is missing in the known Anmit a semiconductor order forming a collector zone. At the same time, this configuration results in bodies of a first conduction type, in which a base 35 of the second metal layer has an improved heat zone of a second conduction type and within the radiation behavior, since a perfect contact base zone can produce an emitter zone of the first conduction type with a heat dissipating element,
each with one on one surface side of the The invention is illustrated by some in the drawing
aufgebrachten Basis- und Emitterelektrode, mit In F i g. 1 umfaßt der Transistor gemäß der Er-covering first insulating film, each with one on FIG. 1 and 2 cross-sections through the execution of this insulating film in the form of a first metal layer, examples of a transistor according to the invention,
applied base and emitter electrode, with In F i g. 1 comprises the transistor according to the
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4333467 | 1967-07-07 |
Publications (3)
Publication Number | Publication Date |
---|---|
DE1764619A1 DE1764619A1 (en) | 1971-05-27 |
DE1764619B2 DE1764619B2 (en) | 1973-05-24 |
DE1764619C3 true DE1764619C3 (en) | 1973-12-06 |
Family
ID=12660920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1764619A Expired DE1764619C3 (en) | 1967-07-07 | 1968-07-05 | transistor |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1764619C3 (en) |
GB (1) | GB1204805A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS547196B2 (en) * | 1971-08-26 | 1979-04-04 | ||
US4177480A (en) * | 1975-10-02 | 1979-12-04 | Licentia Patent-Verwaltungs-G.M.B.H. | Integrated circuit arrangement with means for avoiding undesirable capacitive coupling between leads |
JPS52120768A (en) * | 1976-04-05 | 1977-10-11 | Nec Corp | Semiconductor device |
JPS55163850A (en) * | 1979-06-08 | 1980-12-20 | Fujitsu Ltd | Semiconductor device |
US4380115A (en) * | 1979-12-06 | 1983-04-19 | Solid State Scientific, Inc. | Method of making a semiconductor device with a seal |
-
1968
- 1968-06-26 GB GB30463/68A patent/GB1204805A/en not_active Expired
- 1968-07-05 DE DE1764619A patent/DE1764619C3/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1764619A1 (en) | 1971-05-27 |
DE1764619B2 (en) | 1973-05-24 |
GB1204805A (en) | 1970-09-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C3 | Grant after two publication steps (3rd publication) | ||
E77 | Valid patent as to the heymanns-index 1977 | ||
EHJ | Ceased/non-payment of the annual fee |