JPH04127546A - Manufacture of semiconductor device - Google Patents

Manufacture of semiconductor device

Info

Publication number
JPH04127546A
JPH04127546A JP24936290A JP24936290A JPH04127546A JP H04127546 A JPH04127546 A JP H04127546A JP 24936290 A JP24936290 A JP 24936290A JP 24936290 A JP24936290 A JP 24936290A JP H04127546 A JPH04127546 A JP H04127546A
Authority
JP
Japan
Prior art keywords
tip
ball
lead
bump
wire
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
JP24936290A
Other languages
Japanese (ja)
Inventor
Mamoru Suwa
諏訪 守
Toshiyuki Yoda
敏幸 誉田
Shunichi Sano
俊一 佐野
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.)
Shinko Electric Industries Co Ltd
Fujitsu Ltd
Original Assignee
Shinko Electric Industries Co Ltd
Fujitsu 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 Shinko Electric Industries Co Ltd, Fujitsu Ltd filed Critical Shinko Electric Industries Co Ltd
Priority to JP24936290A priority Critical patent/JPH04127546A/en
Publication of JPH04127546A publication Critical patent/JPH04127546A/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
    • H01L2224/10Bump connectors; Manufacturing methods related thereto
    • H01L2224/11Manufacturing methods
    • H01L2224/113Manufacturing methods by local deposition of the material of the bump connector
    • H01L2224/1133Manufacturing methods by local deposition of the material of the bump connector in solid form
    • H01L2224/1134Stud bumping, i.e. using a wire-bonding apparatus
    • 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
    • H01L2224/74Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies and for methods related thereto
    • H01L2224/78Apparatus for connecting with wire connectors
    • H01L2224/7825Means for applying energy, e.g. heating means
    • H01L2224/783Means for applying energy, e.g. heating means by means of pressure
    • H01L2224/78301Capillary
    • 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
    • H01L2224/80Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L2224/85Methods 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 wire connector
    • H01L2224/85009Pre-treatment of the connector or the bonding area
    • H01L2224/8503Reshaping, e.g. forming the ball or the wedge of the wire connector
    • H01L2224/85035Reshaping, e.g. forming the ball or the wedge of the wire connector by heating means, e.g. "free-air-ball"
    • H01L2224/85045Reshaping, e.g. forming the ball or the wedge of the wire connector by heating means, e.g. "free-air-ball" using a corona discharge, e.g. electronic flame off [EFO]
    • 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
    • H01L2224/80Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L2224/85Methods 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 wire connector
    • H01L2224/852Applying energy for connecting
    • H01L2224/85201Compression bonding
    • H01L2224/85205Ultrasonic bonding

Landscapes

  • Wire Bonding (AREA)

Abstract

PURPOSE:To make it possible to form easily a bump, accordingly, to make it possible to correspond to multi-type products in a short time by a method wherein a ball is formed on the tip of a wire and the ball is pressure bonded on the tip of a lead. CONSTITUTION:A wire 3 is made to penetrate a capillary 2 for wiring bonding use on the tip of a lead 1 of a metal pattern and a ball 3a is formed on the tip of the wire 3 by a torch electrode 4. The ball 3a is pressure bonded on the tip of the lead 1 by a bonding. Then, the wire 3, which is extended outside from the ball 3a, is pressure bonded in the vicinity of the tip, on which the ball 3a is pressure bonded, of the lead 1 by an ultrasonic bonding, for example, and a bump 5 is formed. The lead 1 formed with the bump 5 is pressure bonded and connected to a pad 16 on a chip 15 by a bonding. Thereby, it becomes possible to form easily the bump on the tip of the lead. Moreover, it becomes possible to form a bump on the tip of the lead in a short time without providing facilities for forming bumps in every type.

Description

【発明の詳細な説明】 〔概要〕 金属パターンと半導体チップのボンディングを行う場合
のリード先端にバンプを形成する半導体装置の製造方法
に関し、 リード上に容易にバンプを形成し、短時間に多品種に対
応可能にすることを目的とし、フィルム上に金属パター
ンを形成し、該金属パターンのリード先端にバンプを設
けてチップとボンディングを行う半導体装置の製造方法
において、ボンディング用キャピラリにワイヤを貫通さ
せ、該ワイヤの先端でボールを形成する工程と、該ボー
ルを、前記リードの先端に圧着する工程と、該ボールを
圧着した近傍に、該ボールより延出する前記ワイヤを圧
着して前記バンプを形成する工程と、を含むように構成
する。また、前記ボールをリード先端に圧着した後、該
ボールの上部を抑圧により平坦にしてバンプを形成する
ように構成する。
[Detailed Description of the Invention] [Summary] A semiconductor device manufacturing method that forms bumps at the tips of leads when bonding a metal pattern and a semiconductor chip is provided. A method for manufacturing semiconductor devices in which a metal pattern is formed on a film, bumps are provided at the tips of the leads of the metal pattern, and bonding is performed to the chip. , forming a ball at the tip of the wire, crimping the ball to the tip of the lead, and crimping the wire extending from the ball in the vicinity of the crimped ball to form the bump. The method is configured to include a step of forming. Further, after the ball is crimped to the tip of the lead, the upper part of the ball is flattened by compression to form a bump.

〔産業上の利用分野〕[Industrial application field]

本発明は、金属パターンと半導体チップのボンディング
を行う場合のリード先端のバンプを形成する半導体装置
の製造方法に関する。
The present invention relates to a semiconductor device manufacturing method for forming a bump at the tip of a lead when bonding a metal pattern and a semiconductor chip.

近年、半導体装置の需要は多品種少量生産の傾向を示し
、短期納入が要求されてきている。このことはTA B
 (Tape Automated Bonding)
においても同様であり、転写バンプの作製も短時間で行
う必要がある。
In recent years, demand for semiconductor devices has shown a trend toward high-mix, low-volume production, and short-term delivery has been required. This is TA B
(Tape Automated Bonding)
The same is true for the production of transfer bumps, and it is necessary to produce transfer bumps in a short time.

〔従来の技術〕[Conventional technology]

従来、例えばTAB方式と呼ばれる半導体装置の製造は
、ポリイミド膜等でつくられたフィルム状のテープの一
区画に、金属パターンを形成して、そのリードの先端(
フィンガ部分)に相対応するチップの電極パッドを接合
して行われる。この場合の接合は、リード先端又は、チ
ップ電極にバンプを形成して行う。
Traditionally, semiconductor devices have been manufactured using the TAB method, for example, by forming a metal pattern on a section of a film-like tape made of polyimide film, etc.
This is done by bonding the electrode pads of the corresponding chips to the finger portions. In this case, bonding is performed by forming bumps on the lead tips or tip electrodes.

ここで、リード先端にバンプを形成する方法として転写
バンプがある。すなわちバンプの形成は、半導体装置の
一品種毎にガラス板上に導電層を形成し、該導電層上に
めっき用マスクの絶縁層を形成する。そして、電解めっ
きにより該ガラス板上にバンプを形成し、これをリード
先端に転写するものである。
Here, a transfer bump is a method for forming a bump at the tip of a lead. That is, to form bumps, a conductive layer is formed on a glass plate for each type of semiconductor device, and an insulating layer of a plating mask is formed on the conductive layer. Bumps are then formed on the glass plate by electrolytic plating and transferred to the tips of the leads.

(発明が解決しようとする課題〕 しかし、めっきを成長させてバンプを形成するためには
、−品種毎にガラス板、マスク等を作製しなければなら
ず、また、めっきでバンプを形成することから長時間を
必要する。従って、多品種少量生産製品の短時間納期に
対応できず、製品完成まで、長時間を要するという問題
がある。
(Problem to be solved by the invention) However, in order to form bumps by growing plating, it is necessary to prepare glass plates, masks, etc. for each type, and it is necessary to form bumps by plating. Therefore, there is a problem that it is not possible to meet short delivery times for high-mix, low-volume products, and it takes a long time to complete the product.

そこで、本発明は上記課題に鑑みなされたもので、リー
ド上に容易にバンプを形成し、短時間に多品種に対応可
能にする半導体装置の製造方法を提供することを目的と
する。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a semiconductor device that allows bumps to be easily formed on leads and that can be applied to a wide variety of products in a short time.

〔課題を解決するための手段〕[Means to solve the problem]

第1図及び第2図に、第1及び第2の本発明方法の原理
説明図を示す。第1図において、第1の工程では、ボン
ディング用キャピラリにワイヤを貫通させ、該ワイヤの
先端でボールを形成する。
FIGS. 1 and 2 are diagrams illustrating the principles of the first and second methods of the present invention. In FIG. 1, in the first step, a wire is passed through a bonding capillary and a ball is formed at the tip of the wire.

第2の工程では、該ボールを金属パターンのり一ド先端
に圧着する。第3の工程では、リード先端のボールを圧
着した近傍に、該ボールより延出するワイヤを圧着して
バンプを形成する。そして、このバンプとチップでボン
ディングを行うものである。
In the second step, the ball is crimped onto the tip of the metal pattern glue. In the third step, a bump is formed by crimping a wire extending from the ball in the vicinity of the ball at the tip of the lead. Then, bonding is performed between this bump and the chip.

また、第2図において、上記バンプを形成するに当たり
第1の工程でボンディング用キャピラリによりワイヤを
貫通させ、ワイヤの先端でボールを形成する。第2の工
程では、該ボールをリード先端に圧着する。また、第3
の工程では該ボールの上部を押圧により平坦にしてバン
プを形成するものである。
Further, in FIG. 2, in the first step of forming the bump, a wire is penetrated by a bonding capillary, and a ball is formed at the tip of the wire. In the second step, the ball is crimped onto the tip of the lead. Also, the third
In the process, the upper part of the ball is flattened by pressing to form a bump.

〔作用〕[Effect]

第1図及び第2図に示すように、リード先端にバンプを
形成するに当たり、ワイヤボンディングの手段を用いて
いる。すなわち、ボンディング用キャピラリを貫通させ
たワイヤの先端でボールを形成してリード先端に圧着す
る。
As shown in FIGS. 1 and 2, wire bonding is used to form bumps at the tips of the leads. That is, a ball is formed at the tip of the wire passed through the bonding capillary and is crimped onto the lead tip.

そして、ボールより延長するワイヤをボールの近傍に圧
着してバンプを形成している。又は、圧着したボールの
上部を押圧により平坦化している。
Then, a wire extending from the ball is crimped near the ball to form a bump. Alternatively, the upper part of the crimped ball is flattened by pressing.

これにより、リード先端に容易にバンプを形成すること
が可能となる。また、品種ごとにバンプ作製のための設
備を設けることなく、短時間でリード先端にバンプを形
成することが可能となる。
This makes it possible to easily form a bump at the tip of the lead. Furthermore, it is possible to form bumps on the lead tips in a short time without having to provide equipment for producing bumps for each product type.

〔実施例〕〔Example〕

第3図に第1の発明の一実施例の製造工程図を示す。第
3図において、金属パターンのリード1の先端上で、ワ
イヤボンディング用キャピラリ2にワイヤ3を貫通させ
(第3図(A))、トゥチ電極4によりワイヤ3の先端
にボール3aを形成する(第3図(B))。そして、ボ
ール3aをリード1の先端にボンディングにより圧着す
る(第3図(C))。つぎに、リードlの先端のボール
3aを圧着した近傍に、該ボール3aより延出するワイ
ヤ3を例えば超音波ボンディングにより圧着して(第3
図(D)’) 、バンプ5を形成する(第3図(E))
。この場合の平面図が第3図(F)に示される。
FIG. 3 shows a manufacturing process diagram of an embodiment of the first invention. In FIG. 3, the wire 3 is passed through the wire bonding capillary 2 on the tip of the lead 1 of the metal pattern (FIG. 3(A)), and a ball 3a is formed at the tip of the wire 3 by the touch electrode 4 ( Figure 3 (B)). Then, the ball 3a is crimped onto the tip of the lead 1 by bonding (FIG. 3(C)). Next, a wire 3 extending from the ball 3a is crimped by ultrasonic bonding (a third
Figure (D)'), forming bumps 5 (Figure 3 (E))
. A plan view in this case is shown in FIG. 3(F).

ここで、第4図に、上記バンプが適用されるTABを説
明するための図を示す。第4図(A)は、TA B (
Tape Automated Bonding)の平
面図を示しており、フィルム(テープキャリア)10の
両側にキャリア孔11が穿設され、−区間内にチップ孔
12及び穴部13が打抜き等により穿設される。そして
、このテープキャリアIO上に金属パターン14が図の
ようなパターンで形成され、チップ孔12の空間に延出
した金属パターン14のリード1の先端上に上述のバン
プ5が形成される。バンプ5が形成されたリードlは、
第4図(B)に示すように、チップ15のパッド16に
ボンディングにより圧着接続されるものである。
Here, FIG. 4 shows a diagram for explaining the TAB to which the bump described above is applied. FIG. 4(A) shows TA B (
1, carrier holes 11 are formed on both sides of a film (tape carrier) 10, and chip holes 12 and holes 13 are formed in the - section by punching or the like. Then, a metal pattern 14 is formed on this tape carrier IO in a pattern as shown in the figure, and the above-mentioned bumps 5 are formed on the tips of the leads 1 of the metal pattern 14 extending into the space of the chip hole 12. The lead l on which the bump 5 is formed is
As shown in FIG. 4(B), it is crimped and connected to the pad 16 of the chip 15 by bonding.

次に、第5図に、第2の発明の一実施例の製造工程図を
示す。第5図において、ワイヤ3をワイヤボンディング
用キャピラリ2に貫通させ、ワイヤ3先端にボール3a
を形成することは第3図と同様である。そして、リード
Iの先端にボンディングによりボール3aを圧着しく第
5図(A))、圧着したボール3aより延出するワイヤ
3をクランパ(図示せず)等で挟み切断する(第5図(
B))。その後、下部が平坦に成形された抑圧ツール6
により該ボール3aの上部を押圧して(第5図(C))
、上部が平坦化されたバンプ5aがリードlの先端に形
成される(第5図(D))。この場合の平面図が第5図
(E)に示される。
Next, FIG. 5 shows a manufacturing process diagram of an embodiment of the second invention. In FIG. 5, the wire 3 is passed through the wire bonding capillary 2, and a ball 3a is attached to the tip of the wire 3.
The process of forming is similar to that shown in FIG. Then, the ball 3a is crimped to the tip of the lead I by bonding (FIG. 5(A)), and the wire 3 extending from the crimped ball 3a is pinched and cut with a clamper (not shown) or the like (FIG. 5(A)).
B)). After that, the suppression tool 6 whose lower part is formed flat
Press the upper part of the ball 3a (Fig. 5(C)).
, a bump 5a whose upper portion is flattened is formed at the tip of the lead 1 (FIG. 5(D)). A plan view in this case is shown in FIG. 5(E).

これにより、バンプ5aのチップ15のパッド16(第
4図参照)への接触面積が大きくなる。
This increases the contact area of the bumps 5a with the pads 16 (see FIG. 4) of the chip 15.

また、パッド16にバンプ5aが接触する場合に、バン
プ5aの上部が平坦であることから、パッド16上で位
置ずれを生じることなくボンディング性を良好にするこ
とができる。
Furthermore, when the bumps 5a come into contact with the pads 16, since the upper portions of the bumps 5a are flat, the bonding performance can be improved without causing any positional shift on the pads 16.

次に、第6図に第2図の発明の他の実施例の製造工程図
を示す。第6図において、リードlの先端にワイヤ3の
ボール3aをボンディングにより圧着することは第5図
と同様である(第6図(A))。この場合、ワイヤボン
ディング用キャピラリ2aは、先端が広く平坦に形成さ
れたちのである。そこで、ボール3aをリードlの先端
に圧着後、該キャピラリ2aを横方向に移動し、その先
端でボール3aを上部から押圧する(第6図(B))。
Next, FIG. 6 shows a manufacturing process diagram of another embodiment of the invention shown in FIG. 2. In FIG. 6, the ball 3a of the wire 3 is crimped to the tip of the lead 1 by bonding in the same manner as in FIG. 5 (FIG. 6(A)). In this case, the wire bonding capillary 2a has a wide and flat tip. Therefore, after the ball 3a is crimped onto the tip of the lead 1, the capillary 2a is moved laterally, and its tip presses the ball 3a from above (FIG. 6(B)).

従ってリードlの先端には上部が平坦化されたバンプ5
aが形され(第5図(C))、その平面図が第5図(D
)に示される。これにより、押圧用のツールを別に設け
ることなく、上部から平坦化されたバンプ5aが容易に
形成できる。
Therefore, at the tip of lead l, there is a bump 5 whose upper part is flattened.
a (Fig. 5 (C)), and its plan view is shown in Fig. 5 (D
) is shown. Thereby, the bumps 5a that are flattened from the top can be easily formed without providing a separate pressing tool.

このように、リードlの先端にバンプ5(5a)を形成
するに当たり、新たな装置を必要とせず従来のボンディ
ング技術を適用することで容易かつ短時間にバンプを形
成することができる。
In this way, when forming the bump 5 (5a) at the tip of the lead 1, the bump can be formed easily and in a short time by applying the conventional bonding technique without requiring a new device.

〔発明の効果〕〔Effect of the invention〕

以上のように本発明によれば、ワイヤの先端にボールを
形成し、リードの先端に圧着することにより、容易にバ
ンプを形成することができ、従って、短時間に多品種の
製品に対応可能となり、製品の納期短縮を図ることがで
きる。
As described above, according to the present invention, by forming a ball at the tip of the wire and crimping it to the tip of the lead, it is possible to easily form a bump, and therefore it is possible to respond to a wide variety of products in a short time. This makes it possible to shorten product delivery times.

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

第1図は第1の発明方法の原理説明図、第2図は第2の
発明方法の原理説明図、第3図は第1の発明の一実施例
の製造工程図、第4図はバンプが形成されるTABを説
明するための図、 第5図は第2の発明の一実施例の製造工程図、第6図は
第2の発明の他の実施例の製造工程図である。 図において、 1はリード、 2はワイヤボンディング用キャピラリ、3はワイヤ、 3aはボール、 4はトウチ電極、 5はバンプ を示す。 第 ! 図 第2図 1$1f7発JIFI/)−寧ンし金11の1屹激工槁
閏第3図 バー/岸形1にτ木るTAB!載り哨す)ためd両筒4
図 第5図 第6図
Fig. 1 is an explanatory diagram of the principle of the first invention method, Fig. 2 is an explanatory diagram of the principle of the second invention method, Fig. 3 is a manufacturing process diagram of an embodiment of the first invention, and Fig. 4 is a bump FIG. 5 is a manufacturing process diagram of an embodiment of the second invention, and FIG. 6 is a manufacturing process diagram of another embodiment of the second invention. In the figure, 1 is a lead, 2 is a capillary for wire bonding, 3 is a wire, 3a is a ball, 4 is a touch electrode, and 5 is a bump. No.! Figure 2 Figure 1 $ 1 f7 JIFI/) - Ningen Kin 11 1 屹过工槁阁Figure 3 Bar / Kishigata 1 τ tree TAB! d double cylinder 4
Figure 5 Figure 6

Claims (2)

【特許請求の範囲】[Claims] (1)フィルム(10)上に金属パターンを形成し、該
金属パターンのリード(1)先端にバンプ(5)を設け
てチップ(15)とボンディングを行う半導体装置の製
造方法において、 ボンディング用キャピラリ(2)にワイヤ(3)を貫通
させ、該ワイヤ(3)の先端でボール(3a)を形成す
る工程と(第1の工程)、該ボール(3a)を、前記リ
ード(1)の先端に圧着する工程(第2の工程)と、 該ボール(3a)を圧着した近傍に、該ボール(3a)
より延出する前記ワイヤ(3)を圧着して前記バンプ(
5)を形成する工程(第3の工程)と、 を含むことを特徴とする半導体装置の製造方法。
(1) A method for manufacturing a semiconductor device in which a metal pattern is formed on a film (10), a bump (5) is provided at the tip of a lead (1) of the metal pattern, and bonding is performed with a chip (15), which includes: a capillary for bonding; A step (first step) of passing a wire (3) through the wire (3) and forming a ball (3a) at the tip of the wire (3) (first step); a step of crimping the ball (3a) (second step); and a step of crimping the ball (3a) to
The wire (3) extending further is crimped to form the bump (
5) (third step); and a method for manufacturing a semiconductor device.
(2)フィルム(10)上に金属パターンを形成し、該
金属パターンのリード(1)先端にバンプ(5a)を設
けてチップ(15)とボンディングを行う半導体装置の
製造方法において、 ボンディング用キャピラリ(2、2a)にワイヤ(3)
を貫通させ、該ワイヤ(3)の先端でボール(3a)を
形成する工程(第1の工程)と(第1の工程)、 該ボール(3a)を、前記リード(1)の先端に圧着す
る工程(第2の工程)と、 該ボール(3a)の上部を押圧により平坦にしてバンプ
(5a)を形成する工程(第3の工程)と、 を含むことを特徴とする半導体装置の製造方法。
(2) A method for manufacturing a semiconductor device in which a metal pattern is formed on a film (10), a bump (5a) is provided at the tip of a lead (1) of the metal pattern, and bonding is performed with a chip (15), including a capillary for bonding. (2, 2a) to wire (3)
(first step), forming a ball (3a) at the tip of the wire (3); and crimping the ball (3a) to the tip of the lead (1). (second step); and a step (third step) of flattening the upper part of the ball (3a) to form a bump (5a) (third step). Method.
JP24936290A 1990-09-19 1990-09-19 Manufacture of semiconductor device Pending JPH04127546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24936290A JPH04127546A (en) 1990-09-19 1990-09-19 Manufacture of semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24936290A JPH04127546A (en) 1990-09-19 1990-09-19 Manufacture of semiconductor device

Publications (1)

Publication Number Publication Date
JPH04127546A true JPH04127546A (en) 1992-04-28

Family

ID=17191898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24936290A Pending JPH04127546A (en) 1990-09-19 1990-09-19 Manufacture of semiconductor device

Country Status (1)

Country Link
JP (1) JPH04127546A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5514604A (en) * 1993-12-08 1996-05-07 General Electric Company Vertical channel silicon carbide metal-oxide-semiconductor field effect transistor with self-aligned gate for microwave and power applications, and method of making
US6079610A (en) * 1996-10-07 2000-06-27 Denso Corporation Wire bonding method
US6601752B2 (en) 2000-03-13 2003-08-05 Denso Corporation Electronic part mounting method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5514604A (en) * 1993-12-08 1996-05-07 General Electric Company Vertical channel silicon carbide metal-oxide-semiconductor field effect transistor with self-aligned gate for microwave and power applications, and method of making
US6079610A (en) * 1996-10-07 2000-06-27 Denso Corporation Wire bonding method
US6601752B2 (en) 2000-03-13 2003-08-05 Denso Corporation Electronic part mounting method

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