JPH02133937A - Mounting of bare chip of ic - Google Patents

Mounting of bare chip of ic

Info

Publication number
JPH02133937A
JPH02133937A JP63288103A JP28810388A JPH02133937A JP H02133937 A JPH02133937 A JP H02133937A JP 63288103 A JP63288103 A JP 63288103A JP 28810388 A JP28810388 A JP 28810388A JP H02133937 A JPH02133937 A JP H02133937A
Authority
JP
Japan
Prior art keywords
chip
board
substrate
solder bumps
electrode
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
JP63288103A
Other languages
Japanese (ja)
Inventor
Sunao Abe
直 阿部
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.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric 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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP63288103A priority Critical patent/JPH02133937A/en
Publication of JPH02133937A publication Critical patent/JPH02133937A/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
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/30Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/34Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
    • H05K3/3457Solder materials or compositions; Methods of application thereof
    • H05K3/3473Plating of solder

Landscapes

  • Wire Bonding (AREA)

Abstract

PURPOSE:To enhance reliability of an IC chip and to reduce a production cost by a method wherein a spherical solder bump is formed on an electrode layer formed on an board and, after that, an electrode pad at the chip is connected to the solder bump on the board. CONSTITUTION:An electrode layer 8 is formed on the basis of a desired circuit pattern; after that, a resist film 10 is coated; a pattern used to expose a part of the electrode layer 8 of a board 7 is formed. After that, a diffusion-preventing layer 9 is formed; in succession, a solder is plated 11. After that, the resist film 10 is removed; after that, a spherical solder bump 6 is formed; thereby, the board 7 is obtained. An IC chip 1 where an electrode pad 2 has been formed according to a desired pattern is arranged on the board 7 and is positioned; the board 7 is approached to the side of the chip 1; the solder bump 6 in a molten state on the board 7 is connected to the electrode pad 2 of the IC chip 1. Accordingly, since the solder bump 6 is formed at the part of the electrode layer 8 of the board 7, the chip 1 where a general bump is not formed can be utilized as it is; it is possible to completely eliminate a drop in reliability of the IC chip 1 during a formation process of the solder bump 6.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はIcのべアチップ実装方法に係り、特にICチ
ップをフリップチップ方式により基板上に装着するため
のICのべアチップ実装方法に関する。ここで、本発明
におけるICは、集積回路、大規模集積回路、超大規模
集積回路等を総称したものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an IC bare chip mounting method, and more particularly to an IC bare chip mounting method for mounting an IC chip on a substrate using a flip-chip method. Here, the term "IC" in the present invention is a general term for integrated circuits, large-scale integrated circuits, very large-scale integrated circuits, and the like.

〔従来の技術〕[Conventional technology]

従来から、所望の回路パターンが形成された基板上の電
極層にICチップの電極パッドを接続するベアチップ実
装手段として、ワイヤボンディング法、TAB法、フリ
ップチップ法等があるが、この中で、フリップチップ法
は、ICチップと基板とがはんだバンプにより固着され
た状態となるために、配線長が短くなって、信号伝搬速
度が向上し、また、ICチップの面積で基板との接続が
可能であるために、高密度実装に適していることから、
近年多く用いられている。
Conventionally, there are wire bonding methods, TAB methods, flip chip methods, etc. as bare chip mounting methods for connecting electrode pads of IC chips to electrode layers on a substrate on which a desired circuit pattern is formed. In the chip method, the IC chip and the board are fixed together with solder bumps, so the wiring length is shortened, the signal propagation speed is improved, and the connection to the board can be made using the area of the IC chip. Because of this, it is suitable for high-density mounting.
It has been widely used in recent years.

第6図は従来のフリップチップ法によるICチップを示
したもので、3i等の材料からなるICチップ1の上面
には、Allの電極パッド2が形成されており、この電
極パッド2の上面には、所望のパターンに基づいて前記
電極パッド2を露出させるパツシベーシヨン膜3が形成
されている。
FIG. 6 shows an IC chip manufactured by the conventional flip-chip method. On the upper surface of the IC chip 1 made of a material such as 3i, an All electrode pad 2 is formed. A passivation film 3 is formed to expose the electrode pad 2 based on a desired pattern.

また、前記電極パッド2の露出部分には、N1、Cu、
Pt等の拡散防止!14が形成されており、この拡散防
止層4の上面には、Ti、Cr、NiCr、AI等の’
fl@FIA 5が形成されている。これら各拡散防止
層4およびvH看層5は、スパッタ法、蒸着法、メツキ
法等により形成されるものであり、さらに、前記密S層
5の上面には、球状のはんだバンプ6がメツキ法等の手
段により形成されている。
Further, the exposed portion of the electrode pad 2 contains N1, Cu,
Preventing the diffusion of Pt, etc.! 14 is formed on the upper surface of this diffusion prevention layer 4.
fl@FIA 5 has been formed. These diffusion prevention layers 4 and vH monitoring layers 5 are formed by sputtering, vapor deposition, plating, etc., and furthermore, spherical solder bumps 6 are formed on the upper surface of the dense S layer 5 by plating. It is formed by means such as.

また、このように形成されたICデツプ1は、第7図に
示すように、基板7上に所望の回路パターンに従って形
成された電極1l18に、前記ICチップ1のはんだバ
ンプ6を接合させてリフローさせる等して、前記基板7
上にICチップ1を接続するようにしている。
The IC depth 1 thus formed is then reflowed by bonding the solder bumps 6 of the IC chip 1 to the electrodes 1l18 formed on the substrate 7 according to a desired circuit pattern, as shown in FIG. The substrate 7
An IC chip 1 is connected to the top.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかし、前記従来のICチップ実装方法においては、I
Cデツプ1側にはんだバンプ6を形成するものであるた
め、ICチップ1をIi造する場合に、はんだバンプ6
を形成する工程が必要であり、一般のはんだバンプ6を
形成しないICチップ1に比較して、信頼性が低下して
しまい、製造時における歩留りが著しく低下してしまう
という問題を有している。また、信頼性を高めるために
、はんだバンプ6を形成するまでに、ICチップ1の電
極パッド2上にパッシベーション13、拡散防止lI4
および密1115等からなる多lI!i構造を形成しな
ければならず、製造工程も多く、製造時間も良いもので
あった。しかも、前記はんだバンプ6を形成するため、
ICチップ1の製造コスi・が高くなってしまうという
問題を有している。
However, in the conventional IC chip mounting method, I
Since the solder bumps 6 are formed on the C depth 1 side, when manufacturing the IC chip 1, the solder bumps 6
The process of forming the solder bumps 6 is necessary, and compared to the IC chip 1 in which the general solder bumps 6 are not formed, the reliability is lowered and the yield during manufacturing is significantly lowered. . In addition, in order to improve reliability, passivation 13 is applied to the electrode pads 2 of the IC chip 1 before the solder bumps 6 are formed.
And multi-lI consisting of dense 1115 etc.! The i-structure had to be formed, there were many manufacturing steps, and the manufacturing time was short. Moreover, in order to form the solder bumps 6,
There is a problem in that the manufacturing cost of the IC chip 1 becomes high.

本発明はこれらの点に鑑みてなされたものであり、IC
チップの信頼性を向上させることができ、かつ、ICチ
ップを安価に製造することができ、しかも実装工程を低
減し、かつ確実にICチップを接続することのできるI
Cのベアチップ実装方法を提供することを目的とする。
The present invention has been made in view of these points, and is an IC
An integrated circuit that can improve chip reliability, manufacture IC chips at low cost, reduce mounting steps, and connect IC chips reliably.
The purpose of this invention is to provide a C bare chip mounting method.

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

前記目的を達成するため本発明に係るICのベアチップ
実装方法は、ICチップに形成された電極パッドと基板
上に所望の回路パターンに従って形成された電極層とを
はんだバンプを介して接続するICのベアチップ実装方
法において、前記基板上に形成された電極層上に球状の
はんだバンプを形成し、その後前記ICチップに形成さ
れた電極パッドと前記基板上のはんだバンプとを接続す
るようにしたことを特徴とするものである。
To achieve the above object, the bare chip mounting method for an IC according to the present invention connects electrode pads formed on an IC chip and electrode layers formed on a substrate according to a desired circuit pattern via solder bumps. In the bare chip mounting method, spherical solder bumps are formed on an electrode layer formed on the substrate, and then the electrode pads formed on the IC chip and the solder bumps on the substrate are connected. This is a characteristic feature.

〔作 用〕[For production]

本発明によれば、はんだバンプを基板の電極層部分に形
成するようにしたので、ICチップにはんだバンプを形
成する必要がなく、一般のバンプを形成していないIC
チップをそのまま利用することができ、はんだバンプ形
成工程におけるIcチップの信頼性の低下を防ぐことが
でき、しかも、ICチップの製造コストを低減させるこ
とができ、更に基板上へのはんだバンプの形成は容易で
あり、■枚数を低減して、かつ、確実にICチップを接
続することができるものである。
According to the present invention, since the solder bumps are formed on the electrode layer portion of the substrate, there is no need to form solder bumps on the IC chip, and it is possible to
The chip can be used as it is, the reliability of the IC chip can be prevented from decreasing in the solder bump forming process, and the manufacturing cost of the IC chip can be reduced. (2) The number of IC chips can be reduced and IC chips can be reliably connected.

〔実施例〕〔Example〕

以下、本発明の実施例を第1図から第5図を参照して説
明する。
Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

第1図および第2図は本発明の一実施例を示したもので
、基板7の上面には、電極層8が形成されており、この
電極ll!8の上面には、拡散防止層9が形成されてい
る。また、前記拡散防止層9の上面には、はんだバンプ
6が形成されている。
1 and 2 show an embodiment of the present invention, in which an electrode layer 8 is formed on the upper surface of a substrate 7, and this electrode ll! A diffusion prevention layer 9 is formed on the upper surface of the substrate 8 . Furthermore, solder bumps 6 are formed on the upper surface of the diffusion prevention layer 9.

このような基板7を形成する方法を、第2図により説明
する。
A method for forming such a substrate 7 will be explained with reference to FIG.

先ず、同図(a)に示す基板7上に、同図(b>に示す
ように所望の回路パターンに基づいて電極w!J8を形
成する。その後、同図(C)に示すように、レジスI・
膜10を塗布し、前記基板7の電極li!i8部分を露
出させるパターンを形成する。その後、同図(d)に示
すように、無電界N1メツキ等の手段により、拡散防止
層9を形成し、続いて、同図(e)に示すように、はん
だメツキ11を行なう。その後、同図(f)に示すよう
に、前記レジスト膜10を除去した後、同図(Q)に示
すように、はんだリフロー等を行なって球状のはんだバ
ンプ6を形成することにより、第1図に示す基板7を得
ることができる。
First, the electrode w!J8 is formed on the substrate 7 shown in (a) of the same figure based on a desired circuit pattern as shown in (b) of the same figure. Thereafter, as shown in (C) of the same figure, Regis I.
A film 10 is applied and the electrode li! of the substrate 7 is applied. A pattern is formed to expose the i8 portion. Thereafter, as shown in FIG. 4(d), a diffusion prevention layer 9 is formed by means such as electric fieldless N1 plating, followed by solder plating 11 as shown in FIG. 4(e). Thereafter, as shown in FIG. 1F, after removing the resist film 10, as shown in FIG. The substrate 7 shown in the figure can be obtained.

そして、第3図に示すように、所望のパターンに従って
電極パッド2が形成されたICチップ1を基板7上に配
置して位置決めを行なうとともに、基板7をICチップ
1側へ近接させて、前記基板7上の溶融状態にあるはん
だバンプ6と前記ICチップ1のN極バッド2とを接続
する。
Then, as shown in FIG. 3, the IC chip 1 on which the electrode pads 2 are formed according to a desired pattern is placed and positioned on the substrate 7, and the substrate 7 is brought close to the IC chip 1 side. The molten solder bumps 6 on the substrate 7 and the N-pole pads 2 of the IC chip 1 are connected.

また、前記ICチップ1の電極バッド2がA1+ALJ
材料から形成されている場合は、はんだに対する接合性
がよいので、そのまま、基板7のはんだバンプ6に接続
することができる。しかし、例えば、ICチップ1の電
極パッド2がA1により形成されている場合は、はんだ
に対する接合性が悪いので、第4図に示すように、この
ICチップ1の電極バッド2上に無電界Niメツキ等に
よりはんだに対する接合性、すなわちぬれ性のよい金属
層12を形成した後に、この金属層12を前記基板7の
はんだバンプ6に接続することにより、確実な接続を行
なうことができる。
Further, the electrode pad 2 of the IC chip 1 is A1+ALJ
If it is made of a material, it has good solder bonding properties, so it can be connected to the solder bumps 6 of the substrate 7 as is. However, if the electrode pad 2 of the IC chip 1 is made of A1, for example, the solder bondability is poor, so as shown in FIG. After forming a metal layer 12 with good solder bondability, that is, good wettability, by plating or the like, by connecting this metal layer 12 to the solder bumps 6 of the substrate 7, a reliable connection can be achieved.

したがって、本実施例においては、はんだバンプ6を基
板7の電極層8部分に形成するようにしたので、ICチ
ップ1にはんだバンプ6を形成する必要がなく、一般の
バンプを形成していないICチップ1をそのまま利用す
ることができ、はlυだバンプ6の形成工程に伴うIC
デツプ1の信頼性の低下を皆無とすることができ、しか
も、ICチップ1の製造コストを低減させることができ
る。また、基板7上へのはんだバンプ6の形成は、従来
のICチップ1上への形成に比べて、工程数が低減され
ており、極めて短時間にかつ低コストで製することがで
き、しかもはんだバンプ6とICチップ1との接続を確
実に行なうことができる。
Therefore, in this embodiment, since the solder bumps 6 are formed on the electrode layer 8 portion of the substrate 7, it is not necessary to form the solder bumps 6 on the IC chip 1, and it is possible to The chip 1 can be used as is, and the IC associated with the process of forming the bumps 6 can be used as is.
There can be no reduction in the reliability of the deep layer 1, and the manufacturing cost of the IC chip 1 can be reduced. Furthermore, the number of steps required to form the solder bumps 6 on the substrate 7 is reduced compared to the conventional formation on the IC chip 1, and it can be manufactured in an extremely short time and at low cost. The solder bumps 6 and the IC chip 1 can be reliably connected.

また、第5図は本発明の他の実施例を示したもので、基
板としてガラス基板13を用いたものである。このガラ
ス基板13上に、所望の回路パターンに従って電極層8
を直接形成し、この電極層8上に拡散防止層9を介して
はんだバンプ6を形成すると、はんだの応力により、前
記ガラス基板13上に形成された電極層8が剥離しやす
くなってしまうため、本実施例においては、前記ガラス
基板13と電極層8との間に、中WA層14を介在させ
るようになされている。この中間1114は、前記電極
層8を形成する躾の内部応力と逆方向の内部応力(例え
ば、引張応力に対しては圧縮応力、逆に圧縮応力には引
張応力)を有する蒸着膜であり、例えば、Ta205等
の酸化物絶縁膜やTa2N1Ta−8i02、N 1−
Cr等の抵抗体膜が用いられる。例えば、電極層8とし
てN1メツキ、3nメツキ、5n−Pbメツキ等の材料
を用いた場合、この電極層8材料は、弓張り応力を発生
ずるので、中間層14に前記Ta205、Ta2N、T
a−8io2等の材料を用いれば、前記中間層14が圧
縮応力を発生するので、両層8,14の内部応力同志が
釣り合って、前記電極層8の剥離を有効に防止すること
ができ、ガラス基板13に対する電極層8の密着信頼性
を著しく高めることができる。
Further, FIG. 5 shows another embodiment of the present invention, in which a glass substrate 13 is used as the substrate. An electrode layer 8 is placed on this glass substrate 13 according to a desired circuit pattern.
If solder bumps 6 are formed directly on this electrode layer 8 via a diffusion prevention layer 9, the electrode layer 8 formed on the glass substrate 13 will easily peel off due to the stress of the solder. In this embodiment, a middle WA layer 14 is interposed between the glass substrate 13 and the electrode layer 8. This intermediate 1114 is a deposited film having an internal stress in the opposite direction to the internal stress forming the electrode layer 8 (for example, compressive stress for tensile stress, and tensile stress for compressive stress), For example, oxide insulating films such as Ta205, Ta2N1Ta-8i02, N1-
A resistor film made of Cr or the like is used. For example, when a material such as N1 plating, 3n plating, 5n-Pb plating, etc. is used as the electrode layer 8, the material of the electrode layer 8 generates bowing stress, so the intermediate layer 14 is coated with the Ta205, Ta2N, T
If a material such as a-8io2 is used, the intermediate layer 14 generates compressive stress, so the internal stresses of both layers 8 and 14 are balanced, and peeling of the electrode layer 8 can be effectively prevented. The adhesion reliability of the electrode layer 8 to the glass substrate 13 can be significantly improved.

なお、本発明は前記実施例に限定されるものではなく、
必要に応じて変更することができる。
Note that the present invention is not limited to the above embodiments,
It can be changed as necessary.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明に係るICのベアチップ実装方
法は、はんだバンプを基板の電8i層部分に形成するよ
うにしたので、ICチップにはんだバンプを形成する必
要がなく、一般のバンプを形成していないICチップを
そのまま利用することができ、はんだバンプ形成工程に
おけるICチップの信頼性の低下を防ぐことができ、し
かも、ICチップの製造コスI・を低減させることがで
き、更に基板上へのはんだバンプの形成は容易であり、
工程数を低減し“C1かつ、確実にICチップを基板に
接続することかできる等の効果を奏する。
As described above, in the IC bare chip mounting method according to the present invention, the solder bumps are formed on the electronic 8i layer portion of the board, so there is no need to form solder bumps on the IC chip, and ordinary bumps can be formed. It is possible to use IC chips that have not been soldered as is, prevent a decrease in the reliability of the IC chips in the solder bump forming process, and reduce the manufacturing cost of IC chips. It is easy to form solder bumps on
It has the effect of reducing the number of steps and making it possible to connect the IC chip to the board reliably and with C1.

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

第1図から第5図は本発明の実施例を示したもので、第
1図は基板の縦断面図、第2図(a)から(G)は第1
図の基板の製造工程を示す説明図、第3図および第4図
はそれぞれ基板とICチップとの接続工程を示す説明図
、第5図はガラス基板を用いた他の実施例を示す基板の
縦断面図、第6図は従来のICチップを示す縦断面図、
第7図は従来の基板とICチップとの接続工程を示す説
明図である。 1・・・ICチップ、2・・・電極パッド、6・・・は
んだバンプ、7・・・基板、8・・・電極層、9・・・
拡散防止層、10・・・レジスト膜、12・・・金属層
、13・・・ガラス基板、14・・・中間層。 孔1図
1 to 5 show embodiments of the present invention, in which FIG. 1 is a vertical cross-sectional view of the substrate, and FIGS. 2(a) to 5(G) are the first
3 and 4 are explanatory diagrams showing the process of connecting the substrate and the IC chip, respectively. A vertical cross-sectional view, FIG. 6 is a vertical cross-sectional view showing a conventional IC chip,
FIG. 7 is an explanatory diagram showing a conventional process of connecting a substrate and an IC chip. DESCRIPTION OF SYMBOLS 1... IC chip, 2... Electrode pad, 6... Solder bump, 7... Substrate, 8... Electrode layer, 9...
Diffusion prevention layer, 10... Resist film, 12... Metal layer, 13... Glass substrate, 14... Intermediate layer. Hole 1 diagram

Claims (1)

【特許請求の範囲】[Claims] ICチップに形成された電極パッドと基板上に所望の回
路パターンに従って形成された電極層とをはんだバンプ
を介して接続するICのべアチップ実装方法において、
前記基板上に形成された電極層上にはんだバンプを形成
し、その後前記ICチップに形成された電極パッドと前
記基板上のはんだバンプとを接続するようにしたことを
特徴とするICのベアチップ実装方法。
In an IC bare chip mounting method in which electrode pads formed on an IC chip and electrode layers formed on a substrate according to a desired circuit pattern are connected via solder bumps,
Bare chip mounting of an IC, characterized in that solder bumps are formed on the electrode layer formed on the substrate, and then the electrode pads formed on the IC chip and the solder bumps on the substrate are connected. Method.
JP63288103A 1988-11-15 1988-11-15 Mounting of bare chip of ic Pending JPH02133937A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63288103A JPH02133937A (en) 1988-11-15 1988-11-15 Mounting of bare chip of ic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63288103A JPH02133937A (en) 1988-11-15 1988-11-15 Mounting of bare chip of ic

Publications (1)

Publication Number Publication Date
JPH02133937A true JPH02133937A (en) 1990-05-23

Family

ID=17725835

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63288103A Pending JPH02133937A (en) 1988-11-15 1988-11-15 Mounting of bare chip of ic

Country Status (1)

Country Link
JP (1) JPH02133937A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6077725A (en) * 1992-09-03 2000-06-20 Lucent Technologies Inc Method for assembling multichip modules

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6077725A (en) * 1992-09-03 2000-06-20 Lucent Technologies Inc Method for assembling multichip modules

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