JP4632199B2 - 半導体装置とその製造方法および半導体チップの実装方法 - Google Patents
半導体装置とその製造方法および半導体チップの実装方法 Download PDFInfo
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Description
本発明は、半導体チップと、該半導体チップの外部に配置されるリードフレームと、該リードフレームと前記半導体チップの表面に形成された電極パッドとを電気的に接続する信号用ボンディングワイヤとを備えるとともに、前記半導体チップを構成するシリコン基板の表面に形成された回路パターンを被覆する絶縁膜の表面のうち、前記回路パターンにおける発熱部近傍に配される領域と前記リードフレームとを接続し、前記絶縁膜の表面上に直接接着される放熱用ボンディングワイヤを備える半導体装置を提供する。
このように構成することで、金属膜を介して絶縁膜の表面にボンディングワイヤが接続される。金属膜を介することで、ボンディングワイヤと絶縁膜との接着性を向上し、発熱部からの熱をより効果的に放熱することが可能となる。
本発明によれば、放熱用ボンディングワイヤを接続するステップにより、回路パターンにおける発熱部近傍の領域に配される絶縁膜の表面と外部の伝熱部材、例えば、リードフレームやヒートシンクとが接続される。放熱用ボンディングワイヤは、絶縁膜を挟んで間近に配される発熱部からの熱を直接吸い取って外部の伝熱部材に伝達するよう機能する。したがって、本発明により、半導体チップの発熱部の局所的な温度上昇を抑制した半導体装置を製造することができる。
このように構成することで、絶縁膜上への放熱用ボンディングワイヤの接着性を向上することができる。したがって、絶縁膜への放熱用ボンディングワイヤの接続をより確実に行うことができ、接着部における熱抵抗を低減することができる。
本発明によれば、回路パターンにおける発熱部近傍の領域に配される絶縁膜の表面と外部の伝熱部材、例えば、リードフレームやプリント基板の回路パターンとが放熱用ボンディングワイヤによって接続された状態に半導体チップが実装される。放熱用ボンディングワイヤは、絶縁膜を挟んで間近に配される発熱部からの熱を直接吸い取って外部の伝熱部材に伝達するよう機能する。したがって、本発明により、半導体チップの発熱部の局所的な温度上昇を抑制する放熱対策を施した状態に半導体チップを実装することができる。
このように構成することで、このように構成することで、絶縁膜上への放熱用ボンディングワイヤの接着性を向上することができる。したがって、絶縁膜への放熱用ボンディングワイヤの接続をより確実に行うことができ、接着部における熱抵抗を低減して、より効率的に放熱されるように半導体チップを実装することができる。
本実施形態に係る半導体装置1は、半導体チップ2と、リードフレーム3と、これらを接続するボンディングワイヤ4,5と、これらを被覆するように成形される樹脂モールド部6とを備えている。
半導体チップ2の能動面における周縁近傍には、図1に示されるように、絶縁膜上に露出し回路パターン8に接続する複数の電極パッド10が設けられている。
前記リードフレーム3は、半導体チップ2を接着するアイランド部3aと、アイランド部3aに対して間隔をあけて周囲に配置されるリード部3b,3cとを備えている。
放熱用ボンディングワイヤ5は、図2に示されるように、半導体チップ2の表面に設けられている絶縁膜9の表面に直接接着している。
本実施形態に係る半導体チップ2の実装方法は、リードフレーム3のアイランド部3aの表面に半導体チップ2を接着し、半導体チップ2とリード部3b,3cとを複数のボンディングワイヤ4,5によって接続するものである。半導体チップ2とリード部3b,3cとの接続は、まず、半導体チップ2の表面に露出している電極パッド10とアイランド部3aの周囲に配置されている信号用リード部3bとの間を信号用ボンディングワイヤ4によって接続し、半導体チップ2の発熱部11近傍の表面と放熱用リード部3cとの間を放熱用ボンディングワイヤ5によって接続することにより行われる。その順序は逆でもよい。
本実施形態に係る半導体装置1は、樹脂モールド部6の外部に露出する放熱用リード部3cと半導体チップ2の発熱部11近傍の領域とが放熱用ボンディングワイヤ5によって接続されているので、動作時に大電流が流れることによって発熱部11において大きな発熱が生じたとしても、該発熱部11に、薄い絶縁膜9を介して間近に放熱用ボンディングワイヤ5の端部が接着されているので、発熱部11の熱を放熱用ボンディングワイヤ5を介して半導体チップ2の外部に効率的に逃がすことができる。特に、放熱用ボンディングワイヤ5の他端をリードフレーム3やヒートシンク等の熱容量のより大きな伝熱部材に接続しておくことにより、発熱部11の熱をより効率的に逃がして、発熱部11の局部的な過熱状態を回避することができる。したがって、半導体チップ2を小型化、高集積化することが可能となり、性能向上を図ることができる。
また、半導体チップ2の放熱対策を半導体チップ2に後付けで施すことができる。したがって、半導体チップ2の回路設計を放熱対策に拘束されることなく高い自由度で行うことができる。また、特別な放熱対策が施されていない市販の半導体チップ2を用いても効果的な放熱が行われる半導体装置1を製造することができる。
2 半導体チップ
3 リードフレーム(伝熱部材)
3b 信号用リード部(伝熱部材)
3c 放熱用リード部(伝熱部材)
4 信号用ボンディングワイヤ
5 放熱用ボンディングワイヤ
7 シリコン基板
8 回路パターン
9 絶縁膜
10 電極パッド
11 発熱部
12 金属膜
Claims (3)
- 半導体チップと、該半導体チップの外部に配置されるリードフレームと、該リードフレームと前記半導体チップの表面に形成された電極パッドとを電気的に接続する信号用ボンディングワイヤとを備えるとともに、
前記半導体チップを構成するシリコン基板の表面に形成された回路パターンを被覆する絶縁膜の表面のうち、前記回路パターンにおける発熱部近傍に配される領域と前記リードフレームとを接続し、前記絶縁膜の表面上に直接接着される放熱用ボンディングワイヤを備える半導体装置。 - 半導体チップを構成するシリコン基板の表面に形成された回路パターンを被覆する絶縁膜の表面のうち、前記回路パターンにおける発熱部近傍に配される領域に、外部の伝熱部材に接続される放熱用ボンディングワイヤを前記絶縁膜の表面上に直接接続するステップを備える半導体装置の製造方法。
- 半導体チップを構成するシリコン基板の表面に形成された回路パターンを被覆する絶縁膜の表面のうち、前記回路パターンにおける発熱部近傍に配される領域と、外部の伝熱部材とを放熱用ボンディングワイヤにより前記絶縁膜の表面上に直接接続する半導体チップの実装方法。
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JPS5253670A (en) * | 1975-10-29 | 1977-04-30 | Hitachi Ltd | Semiconductor device |
JPH08125073A (ja) * | 1994-10-27 | 1996-05-17 | Nec Eng Ltd | 半導体パッケージ |
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JPS5253670A (en) * | 1975-10-29 | 1977-04-30 | Hitachi Ltd | Semiconductor device |
JPH08125073A (ja) * | 1994-10-27 | 1996-05-17 | Nec Eng Ltd | 半導体パッケージ |
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