JP2014082384A - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JP2014082384A JP2014082384A JP2012230186A JP2012230186A JP2014082384A JP 2014082384 A JP2014082384 A JP 2014082384A JP 2012230186 A JP2012230186 A JP 2012230186A JP 2012230186 A JP2012230186 A JP 2012230186A JP 2014082384 A JP2014082384 A JP 2014082384A
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Abstract
【解決手段】半導体装置1は、半導体チップ2の表面2aに形成されたソース電極パッド2SPと、リード4Sを電気的に接続する金属クリップ(金属板)7を有している。金属クリップ7は、導電性接合材8Cを介してソース電極パッド2SPと電気的に接続されるチップ接続部7C、導電性接合材8Lを介してリード4Sと電気的に接続されるリード接続部7L、およびチップ接続部7Cとリード接続部7Lの間に位置する中間部7Hを有する。また、中間部7Hとチップ接続部7Cの間には、連結部D1aを挟んで、互いに反対側に配置された、せん断面D1b、D1cを有する、段差部D1が設けられているものである。
【選択図】図6
Description
本願において、実施の態様の記載は、必要に応じて、便宜上複数のセクション等に分けて記載するが、特にそうでない旨明示した場合を除き、これらは相互に独立別個のものではなく、記載の前後を問わず、単一の例の各部分、一方が他方の一部詳細または一部または全部の変形例等である。また、原則として、同様の部分は繰り返しの説明を省略する。また、実施の態様における各構成要素は、特にそうでない旨明示した場合、理論的にその数に限定される場合および文脈から明らかにそうでない場合を除き、必須のものではない。
<回路構成例>
本実施の形態では、半導体チップの電極に金属板が接合された半導体装置の一例として、例えば電子機器の電源回路に、スイッチング回路として組み込まれる半導体装置を取り上げて説明する。また、半導体パッケージの態様として、四角形の平面形状を成す封止体の下面において、チップ搭載部および複数のリードの一部が露出する、SON(Small Outline Non-leaded package)型の半導体装置に適用した実施態様を取り上げて説明する。
次に、図に示す半導体装置1のパッケージ構造について説明する。図3は、図1に示す半導体装置の上面図である。また、図4は、図3に示す半導体装置の下面図である。また、図5は、図3に示す封止体を取り除いた状態で、半導体装置の内部構造を示す平面図である。また、図6は、図5のA−A線に沿った断面図である。また、図7は、図5に示す半導体チップのゲート電極とリードの接続状態を示す拡大断面図である。
次に、図5および図6に示す金属クリップ7の詳細について説明する。図5および図6に示すように金属クリップ7の中間部7Hとチップ接続部7Cの間には段差部D1が設けられている。図6に示すように、段差部D1を設けることにより、チップ接続部7Cの下面7Cbとリード接続部7Lの下面7Lbを異なる高さに配置することができる。この結果、リード4Sの接続面4Baと、半導体チップ2の表面2a(厳密にはソース電極パッド2SPの表面)の高さが異なっている場合であっても、その高低差を段差部D1により調整することができる。
次に、図1〜図9を用いて説明した半導体装置1の製造工程について説明する。半導体装置1は、図10に示すフローに沿って製造される。図10は、図1〜図9を用いて説明した半導体装置の製造工程の概要を示す説明図である。各工程の詳細については、図11〜図25を用いて、以下に説明する。
まず、図10に示すリードフレーム準備工程では、図11〜図13に示すリードフレーム30を準備する。図11は、図10に示すリードフレーム準備工程で準備するリードフレームの全体構造を示す平面図である。また、図12は図11に示すデバイス領域1個分の拡大平面図である。また、図13は図12のA−A線に沿った拡大断面図である。
次に、図10に示す半導体チップ搭載工程では、図14および図15に示すように、リードフレーム30のタブ3に半導体チップ2を搭載する。図14は、図12に示すチップ搭載部上に半導体チップを搭載した状態を示す拡大平面図である。また、図15は図14のA−A線に沿った拡大断面図である。
次に、図10に示すクリップボンディング工程では、図16および図17に示すように、半導体チップ2のソース電極パッド2SPとリード4Sの接続部4Bの接続面4Baを、金属クリップ7を介して電気的に接続する。図16は、図14に示す半導体チップとリードを、金属クリップを介して電気的に接続した状態を示す拡大平面図である。また、図17は図16のA−A線に沿った拡大断面図である。また、図18〜図20は、図17に示す金属クリップを接合する工程を順に示す拡大断面図である。
また、図10に示すワイヤボンディング工程では、図21および図22に示すように、半導体チップ2のゲート電極パッド2GPとリード4Gの接続部4Bの接続面4Baを、ワイヤ(金属ワイヤ)7GWを介して電気的に接続する。
次に、図10に示す封止工程では、図24に示すように、半導体チップ2、タブ3の上面3a、リード4Sの接続部4B、および金属クリップ7を絶縁樹脂で封止し、封止体5を形成する。図23は、図21に示す半導体チップおよび金属クリップを封止する封止体を形成した状態を示す拡大平面図である。また、図24は図23のA−A線に沿った拡大断面において、成形金型内にリードフレームが配置された状態を示す拡大断面図である。
次に、図10に示すめっき工程では、図25に示すように、リードフレーム30を図示しないめっき溶液に浸し、封止体5から露出した金属部分の表面に金属膜SDを形成する。図25は、図24に示すタブおよびリードの封止体からの露出面に金属膜を形成した状態を示す拡大断面図である。
次に、図10に示す個片化工程では、図26に示すように、リードフレーム30をデバイス領域30a毎に分割する。図26は、図23に示すリードフレームを個片化した状態を示す拡大平面図である。
例えば、上記実施の形態では、中間部7Hとチップ接続部7Cの間の1箇所に、段差部D1が設けられた金属クリップ7について説明したが、図27に示す半導体装置1aのように複数の段差部D1、D2を設けることができる。図27は図6に対する変形例である半導体装置を示す断面図である。
また、例えば、上記実施の形態では、中間部7Hの下面7Hbとリード接続部7Lの下面7Lbが同じ高さに配置された金属クリップ7について説明したが、図28に示す半導体装置1bのようにリード接続部7Lを中間部7Hよりも低い位置に配置することができる。図28は図6に対する他の変形例である半導体装置を示す断面図である。
また、例えば、上記実施の形態では、リード4S、4Gは、折り曲げ部4TWにより接続部4Bの高さを高くする実施態様について説明したが、図29に示す半導体装置1cのように、リード4に段差部D4を設けることができる。図29は図6に対する他の変形例である半導体装置を示す断面図である。
また、上記実施の形態では、簡単のため、一つのパッケージに一つの半導体チップが内蔵される実施態様について説明したが、搭載される半導体チップの数は、複数であっても良い。例えば、図1に示す半導体チップ2Hと半導体チップ2Lを一つのパッケージ内に搭載する実施態様に適用できる。
2、2H、2L、2S 半導体チップ
2a 表面
2b 裏面
2DP ドレイン電極
2GP ゲート電極パッド
2HQ、2LQ MOSFET(電界効果トランジスタ、パワートランジスタ)
2SP ソース電極パッド
3 タブ(チップ搭載部)
3a 上面(チップ搭載面)
3b 下面(実装面)
4、4G、4S、4D リード
4a 上面
4b 下面
4B 接続部(金属板接続部、ワイヤ接続部)
4Ba 接続面(上面)
4Bb 下面
4BM 金属膜
4T 端子部
4Ta 上面
4Tb 下面
4TW 折り曲げ部(傾斜部)
5 封止体(樹脂体)
5a 上面
5b 下面(実装面)
5c 側面
6 導電性接合材
7 金属クリップ(金属板、導電性部材)
7C チップ接続部
7c1、7c2 側面
7Ca 上面
7Cb 下面
7GW ワイヤ(導電性部材)
7H、7H1、7H2 中間部
7H1b 下面
7H2b 下面
7Ha 被保持面
7Hb 下面
7L リード接続部
7TW 折り曲げ部(傾斜部)
8C、8L 導電性接合材
10 電源回路
11、12 治具(せん断治具)
11a、12a 上治具
11b、12b 下治具
13 供給装置(シリンジ)
14 コレット(保持治具)
22 入力電源
23 入力コンデンサ
24 負荷
25 コイル
26 出力コンデンサ
30 リードフレーム
30a デバイス領域
30b 外枠
30c 枠部
31 成形金型
32 上型(第1金型)
33 下型(第2金型)
34 キャビティ
BC ボディコンタクト領域
BM バリア導体膜
CH チャネル形成領域
CL 配線
CT 制御回路
D1、D2、D3、D4 段差部
D1a、D2a、D3a、D4a 連結部
D1b、D2b、D3b、D4b せん断面
D1c、D2c、D3c、D4c せん断面
DR1、DR2 ドライバ回路
EP エピタキシャル層
ET1 端子(第1電源端子)
ET2 端子(第2電源端子)
GI ゲート絶縁膜
HD、LD ドレイン
HG、LG ゲート電極
HS、LS ソース
I1、I2 電流(第1電流)
IL 絶縁膜
N 出力ノード
SD 金属膜
SR ソース領域
TL 吊りリード
TR1、TR2 トレンチ(開口部、溝)
Wa 主面
WH 半導体基板
Claims (20)
- チップ搭載面を有する金属製のチップ搭載部と、
第1電極および第2電極が形成される表面、前記表面の反対側に位置し、第3電極が形成される裏面を有し、前記チップ搭載部に第1導電性接合材を介して搭載される半導体チップと、
前記チップ搭載部と離間するように配置され、前記第1電極と電気的に接続される第1リードと、
前記チップ搭載部および前記第1リードと離間するように配置され、前記第2電極と電気的に接続される第2リードと、
第2導電性接合材を介して前記第2電極と電気的に接続されるチップ接続部、第3導電性接合材を介して前記第2リードと電気的に接続されるリード接続部、および前記チップ接続部と前記リード接続部の間に位置する中間部を有し、前記第2電極と前記第2リードを電気的に接続する金属板と、
を備え、
前記金属板は、
平面視において、第1方向に沿って前記半導体チップの前記第2電極上から、前記チップ接続部、前記中間部、および前記リード接続部が順に配置され、
前記中間部と前記チップ接続部の間には第1段差部が設けられ、
前記中間部の下面は、前記チップ接続部の下面よりも高い位置に配置され、
前記第1段差部は、
前記中間部と前記チップ接続部を連結する第1連結部と、
前記第1連結部の下端から前記半導体チップの前記表面に向かうように形成され、前記チップ接続部の下面と連なる第1せん断面と、
前記第1連結部の上端から前記半導体チップとは反対方向に向かうように形成され、前記チップ接続部の上面と連なる第2せん断面と、を有している半導体装置。 - 請求項1において、
前記金属板は、前記第1方向に沿って配置され、かつ互いに対向する第1側面および第2側面を有し、
前記第1段差部は、前記第1および第2側面を結ぶように形成されている半導体装置。 - 請求項2において、
前記第2導電性接合材は、前記第1側面の一部および前記第2側面の一部を覆っている半導体装置。 - 請求項3において、
前記チップ接続部、前記中間部、前記リード接続部の厚さは、それぞれ前記半導体チップの厚さよりも厚い半導体装置。 - 請求項4において、
前記第1段差部の前記第1連結部の厚さは、前記第1せん断面の高さよりも大きい半導体装置。 - 請求項5において、
前記金属板の前記中間部には、前記チップ接続部側に配置される第1中間部と、前記第1中間部と前記リード接続部の間に位置する第2中間部が含まれ、
前記第1段差部は、前記第1中間部と前記チップ接続部の間に設けられ、
前記第1中間部と前記第2中間部の間には第2段差部が設けられ、
前記第2中間部の下面は前記第1中間部の下面よりも高い位置に配置され、
前記第2段差部は、
前記第2中間部と前記第1中間部を連結する第2連結部と、
前記第2連結部の下端から前記半導体チップの前記表面に向かうように形成され、前記第1中間部の下面と連なる第3せん断面と、
前記第2連結部の上端から前記半導体チップとは反対方向に向かうように形成され、前記第1中間部の上面と連なる第4せん断面と、を有している半導体装置。 - 請求項6において、
前記第1連結部および前記第2連結部の厚さは、前記第1せん断面および前記第3せん断面の高さよりも大きい半導体装置。 - 請求項7において、
前記第3せん断面の前記厚さ方向の長さは、前記第1せん断面の前記厚さ方向の長さよりも長い半導体装置。 - 請求項1において、
前記リード接続部の下面は、前記中間部の下面よりも低い位置に設けられ、
前記リード接続部と前記中間部の間には、第3段差部が設けられ、
前記第3段差部は、
前記中間部と前記リード接続部を連結する第3連結部と、
前記第3連結部の下端から下方に向かって形成され、前記リード接続部の下面と連なる第5せん断面と、
前記第3連結部の上端から上方に向かって形成され、前記リード接続部の上面と連なる第6せん断面と、を有している半導体装置。 - 請求項9において、
前記第2リードは、前記封止体から露出する端子部、および前記金属板の前記リード接続部が接続される金属板接続部を有し、
前記金属板接続部の上面は、前記端子部の上面よりも高い位置に配置されている半導体装置。 - 請求項1において、
前記第2リードは、前記封止体から露出する端子部、および前記金属板の前記リード接続部が接続される金属板接続部を有し、
前記第2リードの前記金属板接続部の上面は、前記半導体チップの前記表面よりも高い位置に配置されている半導体装置。 - 請求項1において、
前記第2リードは、前記封止体から露出する端子部、前記金属板の前記リード接続部が接続される金属板接続部、および前記端子部と前記金属板接続部の間に設けられた第4段差部を有し、
前記第2リードの前記金属板接続部の上面は、前記半導体チップの前記表面よりも高い位置に配置され、
前記第4段差部は、
前記金属板接続部と前記端子部を連結する第4連結部と、
前記第4連結部の下端から下方に向かって形成され、前記端子部の下面と連なる第7せん断面と、
前記第4連結部の上端から上方に向かって形成され、前記金属板接続部の上面と連なる第8せん断面と、を有している半導体装置。 - 請求項1において、
前記半導体チップは、電界効果トランジスタを有し、
前記第1電極は、前記電界効果トランジスタのゲートに接続され、
前記第2電極は、前記電界効果トランジスタのソースに接続され、
前記第3電極は、前記電界効果トランジスタのドレインに接続されている半導体装置。 - (a)チップ搭載部、前記チップ搭載部と離間するように配置される第1リード、前記チップ搭載部および前記第1リードと離間するように配置される第2リードを有するリードフレームを準備する工程と、
(b)第1電極および第2電極が形成される表面、前記表面の反対側に位置し、第3電極が形成される裏面を有する半導体チップを、前記チップ搭載部に第1導電性接合材を介して搭載する工程と、
(c)チップ接続部、リード接続部、および前記チップ接続部と前記リード接続部の間に位置する中間部を有する金属板を介して、前記第2電極と前記第2リードを電気的に接続する工程と、
(d)ワイヤを介して、前記第1電極と前記第1リードを電気的に接続する工程と、
(e)前記第1リード、前記第2リード、および前記チップ搭載部の一部が露出するように、前記半導体チップ、前記金属板、および前記ワイヤを樹脂で封止する工程と、
を有し、
前記(c)工程で準備する金属板は、
平面視において、第1方向に沿って前記半導体チップの前記第2電極上から、前記チップ接続部、前記中間部、および前記リード接続部が順に配置され、
前記中間部と前記チップ接続部の間には第1段差部が設けられ、
前記第1段差部は、
前記中間部と前記チップ接続部を連結する第1連結部、前記チップ接続部の下面と連なる第1せん断面、および前記第1せん断面の反対側に形成される第2せん断面を有し、
前記(c)工程には、
(c1)前記第2電極上に第2導電性接合材を、前記第2リード上に第3導電性接合材を、それぞれ配置する工程と、
(c2)前記第2導電性接合材上に前記チップ接続部が、前記第3導電性接合材に前記リード接続部が、それぞれ位置するように、前記金属板を配置する工程と、
(c3)前記第2導電性接合材を介して前記第2電極と前記チップ接続部を接合し、前記第3導電性接合材を介して前記第2リードと前記リード接続部を接合する工程と、
が含まれる半導体装置の製造方法。 - 請求項14において、
前記金属板は、前記第1方向に沿って配置され、かつ互いに対向する第1側面および第2側面を有し、
前記第1段差部は、前記第1および第2側面を結ぶように形成されている半導体装置の製造方法。 - 請求項15において、
前記(c)工程では、
前記第2導電性接合材が、前記第1側面の一部および前記第2側面の一部を覆う半導体装置の製造方法。 - 請求項16において、
(f)前記(c)工程の後、かつ、前記(e)工程の前に、前記金属板と、前記第2電極の接続部を検査する工程、
が含まれている半導体装置の製造方法。 - 請求項14において、
前記第2および第3導電性接合材は、半田であって、
前記(c3)工程では、前記第2および第3導電性接合材を溶融させることで、前記第2導電性接合材を介して前記第2電極と前記チップ接続部を接合し、前記第3導電性接合材を介して前記第2リードと前記リード接続部を接合する半導体装置の製造方法。 - 請求項14において、
前記第2および第3導電性接合材は、熱硬化性樹脂を含む樹脂中に、複数の導電性粒子を含有する導電性樹脂であって、
前記(c3)工程では、前記第2および第3導電性接合材に含まれる熱硬化性樹脂成分を熱硬化させることで、前記第2導電性接合材を介して前記第2電極と前記チップ接続部を接合し、前記第3導電性接合材を介して前記第2リードと前記リード接続部を接合する半導体装置の製造方法。 - 請求項14において、
前記(c)工程で準備する金属板の前記第1段差部は、
前記中間部と前記チップ接続部を、それぞれ独立したせん断加工治具で押さえた状態でプレス加工を施すことにより、前記中間部と前記チップ接続部の位置を厚さ方向にずらす加工法により形成される半導体装置の製造方法。
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JP6161251B2 (ja) | 2017-07-12 |
CN103779311A (zh) | 2014-05-07 |
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US20140103510A1 (en) | 2014-04-17 |
TW201417288A (zh) | 2014-05-01 |
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US9111922B2 (en) | 2015-08-18 |
CN103779311B (zh) | 2018-01-02 |
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