[go: up one dir, main page]

JPH02170454A - Lead frame - Google Patents

Lead frame

Info

Publication number
JPH02170454A
JPH02170454A JP63324381A JP32438188A JPH02170454A JP H02170454 A JPH02170454 A JP H02170454A JP 63324381 A JP63324381 A JP 63324381A JP 32438188 A JP32438188 A JP 32438188A JP H02170454 A JPH02170454 A JP H02170454A
Authority
JP
Japan
Prior art keywords
die pad
resin
lead frame
semiconductor chip
chip
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.)
Pending
Application number
JP63324381A
Other languages
Japanese (ja)
Inventor
Hajime Kisanuki
木佐貫 肇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP63324381A priority Critical patent/JPH02170454A/en
Publication of JPH02170454A publication Critical patent/JPH02170454A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481Disposition
    • H01L2224/48151Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48245Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
    • H01L2224/48247Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/15Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/181Encapsulation

Landscapes

  • Die Bonding (AREA)
  • Lead Frames For Integrated Circuits (AREA)

Abstract

PURPOSE:To increase a close contact property between the rear surface of a die pad and a resin package and to eliminate a crack at a soldering operation by a method wherein, in a lead frame used to assemble an external lead of a resin-sealed type semiconductor device, a peripheral edge of the die pad is extended largely from a semiconductor chip and many through holes are made here. CONSTITUTION:A semiconductor chip 11 is attached to a die pad part 10 of a lead frame 1 composed of a metal such as a copper alloy, a 42 alloy or the like. During this process, an extension 10' which is larger than the chip 11 is formed at a peripheral edge of the die pad 10; many through holes 12 are made here. After that, the chip 11 is attached to the die pad 10 by using this lead frame 1; discrete electrodes of the chip 11 and inner leads 14 corresponding to them are connected by using wires 16; this assembly is molded with a resin 17. Thereby, the resin 17 creeps into the through holes at a molding operation; a close contact property between a resin package and the pad 10 is enhanced; an air bubble or the like is not produced at a soldering operation.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、主に樹脂封止型の半導体装置の外部リード付
は組立に使用されるリードフレームに関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates primarily to a lead frame used for assembly of resin-sealed semiconductor devices with external leads.

(従来の技術) 樹脂封止型の半導体装置の組立には、金属製のリードフ
レームが用いられている。かかるリードフレームは、薄
い金属盤をプレスで打ち抜いたり、エツチングによって
形成されるものである。
(Prior Art) A metal lead frame is used to assemble a resin-sealed semiconductor device. Such a lead frame is formed by punching a thin metal plate with a press or by etching.

第3図は、従来のリードフレーム(2)を示している。FIG. 3 shows a conventional lead frame (2).

(20)はダイパッドであって、ここに半導体チップ(
21)が装着される。
(20) is a die pad, and here is a semiconductor chip (
21) is attached.

(22)はダイパッド(20)を支持するダイパッドサ
ポート、(23)はダイパッド(20)周縁に対向する
ように設けられたインナーリード、(24)は矩形状に
形成されたダムバーであって、これらダイパッドサポー
ト(22)とインナーリード(23)を連繋すると共に
、後述するようにリードフレームに樹脂モールドを施す
際に樹脂の流出をせき止めるものである。
(22) is a die pad support that supports the die pad (20), (23) is an inner lead provided to face the periphery of the die pad (20), and (24) is a dam bar formed in a rectangular shape. It connects the die pad support (22) and the inner lead (23), and also prevents resin from flowing out when resin molding is applied to the lead frame as described later.

以上のようなリードフレーム(2)を用いて樹脂封止型
の半導体装置を組立るには、先ず、ダイパッド(20)
上に半導体チップ(21)を装着すると共に、半導体チ
ップ(21)の各tiとそれに対応するインナーリード
(23)とをワイヤ(25)で接続し、その後、ダムバ
ー(24)の内側領域を樹脂(26)でモールドし半導
体チップ(21)を完全に覆う。
In order to assemble a resin-sealed semiconductor device using the lead frame (2) as described above, first, the die pad (20) is assembled.
A semiconductor chip (21) is mounted on top, each ti of the semiconductor chip (21) and its corresponding inner lead (23) are connected with a wire (25), and then the inner area of the dam bar (24) is covered with resin. (26) to completely cover the semiconductor chip (21).

そして、ダムバー(24)を切断除去することにより、
いわゆるフラットリード型の半導体素子を得ることがで
きる。
Then, by cutting and removing the dam bar (24),
A so-called flat lead type semiconductor element can be obtained.

また、樹脂(26)モールドの外側に突出したアウター
リード(27)を折曲することにより、インライン型の
半導体素子を得ることができる。
Furthermore, by bending the outer leads (27) that protrude to the outside of the resin (26) mold, an in-line type semiconductor element can be obtained.

以上のようにして得られた半導体素子は、プリント基盤
などに挿入されたり、プリント基盤の表面に面実装され
たりする。
The semiconductor element obtained as described above is inserted into a printed circuit board or the like, or is surface mounted on the surface of the printed circuit board.

近年、半導体素子のパッケージ形態が小型化、薄型化、
多ビン化へと移行しつつあり、才な、実装面積を小さく
するために面実装パッケージが増加しつつある。
In recent years, the packaging format of semiconductor devices has become smaller, thinner,
There is a shift towards multi-bin packaging, and surface mount packages are increasing in order to reduce the mounting area.

しかし、半導体素子の面実装を半田付で行うと樹脂(2
6)のパッケージにクラックが発生する恐れがある。
However, when surface-mounting semiconductor elements by soldering, resin (2
6) There is a risk of cracks occurring in the package.

即ち、第4図(a)のように、半導体素子の面実装をす
るに際して、アウターリード(27)とプリント基盤(
30)のtlz(31)とを半田付(32)で接合する
と、半田付されるときの高熱がアウターリード(27)
を伝わって伝導し、樹脂(26)のパッケージ内におい
て水蒸気等の気泡(28)が発生する[第4図(b)参
照]。
That is, as shown in FIG. 4(a), when surface mounting a semiconductor element, the outer lead (27) and the printed board (
When connecting tlz (31) of 30) with soldering (32), the high heat generated during soldering will cause the outer lead (27)
, and bubbles (28) of water vapor or the like are generated within the resin (26) package [see FIG. 4(b)].

そして、かかる気泡(28)に引き続いて、第4図(C
)のように、ダイパッド(20)と樹脂(26)の内面
との剥離が進むと共に、樹脂(26)のパッケージが膨
らみ、遂には、その変形に要する応力によってパッケー
ジにクラック(29)を生じさせる[第4図(d)参照
]。
Then, following such bubbles (28), FIG.
), as the peeling between the die pad (20) and the inner surface of the resin (26) progresses, the resin (26) package swells, and the stress required for the deformation eventually causes the package to crack (29). [See Figure 4(d)].

そこで、以上のような半導体素子の面実装を半田付で行
う際のパッケージクラックを防止するものとして、第5
図に示すように、ダイパッド(20)全面に点在させて
円孔を穿設したり、或はダイパッド(20)下面にデイ
ンプルと呼ばれる凹凸を形成したり、5n−Ni鍍金を
施したりして、樹脂(26)とダイパッド(20)との
密着性の向上を図り、気泡(28)の発生を防ぐ手段が
提案されている。
Therefore, in order to prevent package cracks when surface mounting semiconductor elements as described above by soldering, the fifth method is proposed.
As shown in the figure, circular holes are formed scattered over the entire surface of the die pad (20), or irregularities called dimples are formed on the bottom surface of the die pad (20), or 5n-Ni plating is applied. , a means has been proposed to improve the adhesion between the resin (26) and the die pad (20) and to prevent the generation of air bubbles (28).

(発明が解決しようとする課題) しかるに、以上のような提案がなされても、第4図のよ
うにダイパッドの中央部分に円孔を穿設すると、半導体
チップのグイパッド装着時に使用するエポキシペースト
などがこの円孔から流れ落ちるので、ワイヤボンディン
グする際にワイヤボンダーを汚し、作業性を妨げるとい
う問題がある。
(Problem to be Solved by the Invention) However, even with the above proposals, if a circular hole is drilled in the center of the die pad as shown in Figure 4, the epoxy paste used when attaching the die pad to the semiconductor chip will be removed. flows down from this circular hole, which contaminates the wire bonder during wire bonding and impedes work efficiency.

また、ダイパッド下面にデインプルを形成したり、5n
−Ni鍍金を施しなりしただけではクラックの発生を充
分に防げない。
In addition, dimples are formed on the bottom surface of the die pad, and 5n
-Ni plating alone cannot sufficiently prevent the occurrence of cracks.

従って、本発明の目的は、以上の技術的課題を解決し、
半導体素子を面実装する際に発生する恐れのあるパッケ
ージクラックを効果的に防ぐことが可能なリードフレー
ムを提供することにある。
Therefore, the purpose of the present invention is to solve the above technical problems,
An object of the present invention is to provide a lead frame that can effectively prevent package cracks that may occur when surface-mounting semiconductor elements.

(課題を解決するための手段) 以上の技術的を解決するために、ダイパッド周縁を半導
体チップより大きく延設すると共に、その延設した部分
に多数の抜き孔を穿設するようにしてリードフレームを
構成した。
(Means for Solving the Problems) In order to solve the above technical problems, the die pad periphery is extended larger than the semiconductor chip, and a large number of holes are drilled in the extended portion to form a lead frame. was configured.

(作用) 本発明のリードフレームを用いて半導体素子を作成すれ
ば、モールドされた樹脂がダイパッド周縁の延設部に穿
設された多数の抜き孔内に入り込み、ダイパッドを介し
て上下に樹脂のパッケージが接続されるため、その上下
同士が互いに支持し合って樹脂パッケージ内面とダイパ
ッドとの密着性が向上する。従って、本発明のリードフ
レームを用いて組み立てた半導体素子を半田付で面実装
してもパッケージクラックを防ぐことができる。
(Function) When a semiconductor device is manufactured using the lead frame of the present invention, the molded resin enters into the numerous punch holes drilled in the extended portion of the die pad periphery, and the resin flows upward and downward through the die pad. Since the packages are connected, their upper and lower sides support each other, improving the adhesion between the inner surface of the resin package and the die pad. Therefore, even if a semiconductor element assembled using the lead frame of the present invention is surface-mounted by soldering, package cracks can be prevented.

しかも、抜き孔は半導体チップより外側の延設部分に穿
設されたものであるから、半導体チップのグイパッド装
着時に使用するエポキシペーストなどがこの抜き孔から
流れ落ちることがなく、ワイヤボンディングする際にワ
イヤボンダーを汚したりして、作業性を妨げるといった
間離がない。
Moreover, since the punching hole is drilled in the extended portion outside the semiconductor chip, the epoxy paste used when attaching the semiconductor chip to the guide pad will not flow through the punching hole, and the wire There is no possibility of contaminating the bonder and hindering work efficiency.

(実施例) 以下、図面を基にして本発明の詳細な説明する。(Example) Hereinafter, the present invention will be described in detail based on the drawings.

近年、リードフレームは多ピン化の傾向にある。In recent years, there has been a tendency for lead frames to have more pins.

そして、インナーリードの先端幅はワイヤーボンディン
グの作業性及び信頼性の面から、最低でも80μ−程度
をIi1保する必要がある。また、インナーリード先端
同士の間隔は加工能力の点から、例えば、最低でも10
0μm必要とする。
From the viewpoint of wire bonding workability and reliability, the width of the tip of the inner lead must be kept at least about 80 μ-Ii1. In addition, the distance between the tips of the inner leads should be at least 10 mm from the viewpoint of processing ability, for example.
0 μm is required.

従って、多ピン化するに従い、グイパッド周縁とインナ
ーリード先端の間隙は必然的に広くなる。
Therefore, as the number of pins increases, the gap between the periphery of the pad and the tip of the inner lead inevitably becomes wider.

そこで、本発明ではこの広くなっている間隙を有効に利
用して、ダイパッド周縁を半導体チップより大きく延設
すると共に、その延設したグイパッド周縁部に多数の抜
き孔を穿設するようにしてリードフレームを構成したも
のである。
Therefore, in the present invention, by making effective use of this wide gap, the peripheral edge of the die pad is extended larger than the semiconductor chip, and a large number of holes are drilled in the peripheral edge of the extended die pad to lead the leads. It consists of a frame.

第1図は、本発明にかかるリードフレーム(1)を示し
ている。
FIG. 1 shows a lead frame (1) according to the present invention.

リードフレーム(1)は、銅合金、4270イなどの金
属からなり、厚さ0.15mm程度の金属板を打ち抜き
加工したり、エツチング加工することによって作られる
ものである。
The lead frame (1) is made of metal such as copper alloy or 4270I, and is made by punching or etching a metal plate approximately 0.15 mm thick.

(10)はダイパッドであって、ここに半導体チップ(
11)が装着される。
(10) is a die pad, and here is a semiconductor chip (
11) is installed.

ダイパッド(lO)の周縁には半導体チップ(11)よ
りも大きく形成された延設部(to’)がある。
At the periphery of the die pad (lO), there is an extended portion (to') formed larger than the semiconductor chip (11).

また、この延設部(10’)には、多数の抜き孔(12
)・・・が穿設されている。
In addition, this extension part (10') has a large number of punch holes (12').
)... are drilled.

その他の点については、先に第3図に於て説明したもの
と同じであり、(13)はダイパッド(10)を支持す
るダイパッドサポート、(14)はダイパッド(10)
周縁に対向するように設けられたインナーリード、(1
5)は矩形状に形成されたダムバーであって、このダム
バー(15)でこれらダイパッドサポート(13)とイ
ンナーリード(14)を連繋すると共に、リードフレー
ムの樹脂モールドを施す際に樹脂の流出をせき止める。
The other points are the same as those explained earlier in FIG.
Inner lead provided to face the periphery, (1
5) is a dam bar formed in a rectangular shape, and this dam bar (15) connects the die pad support (13) and the inner lead (14), and also prevents resin from flowing out when resin molding the lead frame. Stop it.

第2図は、本発明にかかるリードフレーム(1)を用い
て、ダイパッド(10)上に半導体チップ(11)を装
着すると共に、半導体チップ(11)の各電極とそれに
対応するインナーリード(14)とをワイヤ(16)で
接続し、その後、樹脂(17)でモールドし半導体チッ
プ(11)を完全に覆うようにして作成した半導体素子
を示している。
FIG. 2 shows a semiconductor chip (11) mounted on a die pad (10) using a lead frame (1) according to the present invention, and also shows each electrode of the semiconductor chip (11) and its corresponding inner lead (14). ) are connected with wires (16), and then molded with resin (17) to completely cover the semiconductor chip (11).

以上のものによれば、モールドされた樹脂(17)がダ
イパッド(10)周縁の延設部(10’)に穿設された
多数の抜き孔(12)内に入り込み、ダイバ・ソド(1
0)の上下を介して樹脂(17)のパッケージが接続さ
れるため、その上下同士が互いに支持し合って樹脂(1
7)パッケージ内面とダイパッド(10)の密着性が向
上する。従って、本発明のリードフレーム(1)を用い
て組み立てた半導体素子を半田付で面実装しても、気泡
の発生がなく、パッケージクラックを防止できる。
According to the above, the molded resin (17) enters into the numerous punch holes (12) drilled in the extended portion (10') at the peripheral edge of the die pad (10), and
Since the resin (17) package is connected through the upper and lower sides of the resin (17), the upper and lower sides support each other and the resin (17)
7) Adhesion between the inner surface of the package and the die pad (10) is improved. Therefore, even if a semiconductor element assembled using the lead frame (1) of the present invention is surface-mounted by soldering, no air bubbles are generated and package cracks can be prevented.

また、抜き孔(12)は半導体チップ(11)より外側
の延設部(l O’)に穿設されているから、半導体チ
ップ(11)をダイパッド(10)に装着する時に使用
されるエポキシペーストなどがこの抜き孔(12)から
流れ落ちることがない。
In addition, since the punch hole (12) is formed in the extended portion (L O') outside the semiconductor chip (11), the epoxy used when mounting the semiconductor chip (11) on the die pad (10) Paste etc. will not flow down from this hole (12).

なお、本発明リードフレーム(1)において、ダイパッ
ド(10)下面にデインプルを形成したり、5n−Ni
鍍金を施したりすると、樹脂(17)とダイパッド(1
0)との密着性を更に向上させることができ、気泡の発
生、更にはパッケージクラックの発生をより確実に防ぐ
ことができる。
In the lead frame (1) of the present invention, dimples are formed on the lower surface of the die pad (10), 5n-Ni
When plating is applied, the resin (17) and die pad (1
0), and the generation of bubbles and package cracks can be more reliably prevented.

(発明の効果) 以上何れにしても本発明によれば、樹脂モールドの際、
リードフレームのグイパッド下面と樹脂パッケージとの
密着性が増し、面実装の半田付けの際、クラックの発生
しない、信頼性の高いパッケージを得ることができる。
(Effect of the invention) In any case, according to the present invention, during resin molding,
The adhesiveness between the lower surface of the lead frame pad and the resin package is increased, and a highly reliable package that does not generate cracks during surface mount soldering can be obtained.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明にかかるリードフレームの平面図、 第2図は第1図のリードフレームで構成された半導体素
子の縦断面図、 第3図は従来のリードフレームの平面図、第4図は第3
図のリードフレームで構成された半導体素子の縦断面図
、 第5図は従来のリードフレームの部分平面図を表す。 ■・・・リードフレーム lO・・・ダイパッド 10’・・・延設部 11・・・半導体チップ 12・・・インナーリード 3・・・ダイバッドサボー 4・・・インナーリード 5・・・ダムバー 6・・・ワイヤ 7・・・樹脂 ト
FIG. 1 is a plan view of a lead frame according to the present invention, FIG. 2 is a vertical cross-sectional view of a semiconductor element configured with the lead frame of FIG. 1, FIG. 3 is a plan view of a conventional lead frame, and FIG. is the third
FIG. 5 is a longitudinal cross-sectional view of a semiconductor element constructed with the lead frame shown in FIG. 5, and FIG. 5 is a partial plan view of a conventional lead frame. ■...Lead frame lO...Die pad 10'...Extension portion 11...Semiconductor chip 12...Inner lead 3...Die pad sabot 4...Inner lead 5...Dam bar 6 ...Wire 7...Resin

Claims (1)

【特許請求の範囲】[Claims] ダイパッド周縁を半導体チップより大きく延設し、該延
設部に多数の抜き孔を穿設したリードフレーム
A lead frame in which the periphery of the die pad extends larger than the semiconductor chip and has many punch holes in the extended area.
JP63324381A 1988-12-22 1988-12-22 Lead frame Pending JPH02170454A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63324381A JPH02170454A (en) 1988-12-22 1988-12-22 Lead frame

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63324381A JPH02170454A (en) 1988-12-22 1988-12-22 Lead frame

Publications (1)

Publication Number Publication Date
JPH02170454A true JPH02170454A (en) 1990-07-02

Family

ID=18165157

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63324381A Pending JPH02170454A (en) 1988-12-22 1988-12-22 Lead frame

Country Status (1)

Country Link
JP (1) JPH02170454A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04324667A (en) * 1991-04-24 1992-11-13 Mitsui High Tec Inc Lead frame and its manufacture
US6326243B1 (en) 1995-08-15 2001-12-04 Kabushiki Kaisha Toshiba Resin sealed semiconductor device including a die pad uniformly having heat conducting paths and circulating holes for fluid resin
JP2008300587A (en) * 2007-05-31 2008-12-11 Renesas Technology Corp Semiconductor device and manufacturing method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04324667A (en) * 1991-04-24 1992-11-13 Mitsui High Tec Inc Lead frame and its manufacture
US6326243B1 (en) 1995-08-15 2001-12-04 Kabushiki Kaisha Toshiba Resin sealed semiconductor device including a die pad uniformly having heat conducting paths and circulating holes for fluid resin
JP2008300587A (en) * 2007-05-31 2008-12-11 Renesas Technology Corp Semiconductor device and manufacturing method thereof

Similar Documents

Publication Publication Date Title
US7790500B2 (en) Partially patterned lead frames and methods of making and using the same in semiconductor packaging
KR100369393B1 (en) Lead frame and semiconductor package using it and its manufacturing method
US8236612B2 (en) Partially patterned lead frames and methods of making and using the same in semiconductor packaging
JP4917112B2 (en) Semiconductor device
JP4095827B2 (en) Semiconductor device
US8502360B2 (en) Resin sealing type semiconductor device and method of manufacturing the same, and resin sealing type electronic device
JP2005057067A (en) Semiconductor device and manufacturing method thereof
TW201423917A (en) Resin-encapsulated semiconductor device and method of manufacturing the same
JP3046024B1 (en) Lead frame and method of manufacturing resin-encapsulated semiconductor device using the same
KR20000048011A (en) A semiconductor device
US6608369B2 (en) Lead frame, semiconductor device and manufacturing method thereof, circuit board and electronic equipment
KR20040037575A (en) Micro leadless package having oblique etching line
JP2000307049A (en) Lead frame, resin-sealed-type semiconductor device using lead frame, and its manufacturing method
US20200091060A1 (en) Semiconductor device
JPH02170454A (en) Lead frame
JPH11121680A (en) Lead frame and semiconductor device
CN113410201A (en) Semiconductor device, lead frame and method for manufacturing semiconductor device
JP2002076234A (en) Resin-sealed semiconductor device
JP4031005B2 (en) Manufacturing method of semiconductor device
JP2017108191A (en) Semiconductor device
JPH11330343A (en) Resin-sealed semiconductor device
JP2002164496A (en) Semiconductor device and manufacturing method thereof
JP2002026192A (en) Lead frame
JPH04254363A (en) Lead frame and semiconductor integrated circuit device using the same
JP3013611B2 (en) Method for manufacturing semiconductor device