JP4357493B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP4357493B2 JP4357493B2 JP2006080962A JP2006080962A JP4357493B2 JP 4357493 B2 JP4357493 B2 JP 4357493B2 JP 2006080962 A JP2006080962 A JP 2006080962A JP 2006080962 A JP2006080962 A JP 2006080962A JP 4357493 B2 JP4357493 B2 JP 4357493B2
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Description
(1)式でチップの内部抵抗R4を除いた部分が実装抵抗となる。バンプの抵抗R6は、
R6=(ρ×h/S)/n …(2)
(ここでρ:バンプの固有抵抗,h:バンプ高さ,S:断面積,n:バンプ数)で表わされる。Auバンプの寸法は、Alパッド上にバンプを低コストで直接形成できるワイヤのボールボンディングで作るとすると、直径:150μm,厚さ:20μmが標準的な寸法になる。この場合のバンプの抵抗は(0.026/n)mΩとなり、十分小さくできる。次にAl電極膜の抵抗R5は、
R5≒(ρ/4πt)ln(r2/r1) …(3)
(ここで、ρ:電極膜の固有抵抗,t:電極膜厚,r2:電極外径,r1:バンプ径)で表わされる。電極外径r2は、バンプを均等にn個配置した場合ほぼ1/(n1/2)に比例するためn数を増せばr2/r1は1に近づき、電極膜厚を厚くしてバンプ数を多くすれば、R5は十分に小さくできる。外部接続端子の抵抗(R1+R7)は、単純に、
(R1+R7)=ρ×L/S …(4)
(ここでρ:リードの固有抵抗,L:リードの通電長さ,S:通電断面積)で表わされ、前述したように標準的な表面実装用のSOPパッケージの場合(厚さ:0.16mm/幅:0.3mm/長さ:2mm×2)で1.4mΩ程度になる。すなわち、実装抵抗が1mΩ以下のレベルでは、単にバンプ構造を採用するだけでは実装抵抗を下げられず、外部接続端子の抵抗を下げる構造を採用しなければならない。そこで、本発明による半導体装置においては、外部接続端子の抵抗を下げると同時に、外部接続端子と配線基板の接続部の信頼性を確保し得る構造とした。
以下、上記の実施形態の具体的構造を示す本発明の実施例を図面を用いて詳細に説明する。
る。
Claims (4)
- 表面実装用の半導体装置であって、
MOSFETが形成された半導体基板と、
前記半導体基板の第1主面に設けられ、前記MOSFETのソースと電気的に接続されたソース電極と、
前記半導体基板の前記第1主面に設けられ、前記MOSFETのゲートと電気的に接続されたゲート電極と、
前記半導体基板の第1主面と反対側の第2主面に設けられ、前記MOSFETのドレインと電気的に接続されたドレイン電極と、
前記ソース電極と対向するように配置され、前記ソース電極と電気的に接続されたソース用金属部材と、
前記ゲート電極と対向するように配置され、前記ゲート電極と電気的に接続されたゲート用金属部材と、
前記ドレイン電極と対向するように配置され、前記ドレイン電極に電気的に接続されたドレイン用金属部材と、
前記半導体基板、前記ソース用金属部材、前記ゲート用金属部材およびドレイン用金属部材を被覆する樹脂体とを有し、
前記ソース用金属部材は、前記半導体基板の前記第1主面と平面的に重なる領域内において、前記ソース電極との接合面と反対側の面が前記樹脂体から露出し、
前記ゲート用金属部材は、前記半導体基板の前記第1主面と平面的に重なる領域内において、前記ゲート電極との接合面と反対側の面が前記樹脂体から露出し、
前記樹脂体から露出した前記ソース用金属部材および前記ゲート用金属部材が実装面となることを特徴とする半導体装置。 - 請求項1に記載の半導体装置において、前記ソース用金属部材、前記ゲート用金属部材および前記ドレイン用金属部材は銅を含むことを特徴とする半導体装置。
- 請求項1に記載の半導体装置において、前記ソース電極、前記ゲート電極および前記ドレイン電極はアルミニウムを含むことを特徴とする半導体装置。
- 請求項1に記載の半導体装置において、前記ドレイン用金属部材には折り曲げ加工が施されていることを特徴とする半導体装置。
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