JP2008098585A - 半導体装置及び半導体装置の製造方法 - Google Patents
半導体装置及び半導体装置の製造方法 Download PDFInfo
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- JP2008098585A JP2008098585A JP2006281694A JP2006281694A JP2008098585A JP 2008098585 A JP2008098585 A JP 2008098585A JP 2006281694 A JP2006281694 A JP 2006281694A JP 2006281694 A JP2006281694 A JP 2006281694A JP 2008098585 A JP2008098585 A JP 2008098585A
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- semiconductor device
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Abstract
【解決手段】半導体装置10内の電気的接続を複数の導体板であるリードフレーム23,24,25,26,27で行う。ここで、それぞれの溶接部23a,23b,23c,24a,24b,24c,25a,25b,26a,26b,27a,27bがレーザー溶接で用いるレーザー光源に向けて露出するように、リードフレーム23,24,25,26,27を立体的に配置する。そして、レーザー光を照射させ、レーザー溶接を行う。このような半導体装置及び半導体装置の製造方法によれば、溶接が簡便且つ確実になり、半導体装置及び半導体装置の生産性が高くなる。また、リードフレーム23,24,25,26,27に冷却効果があり、ヒートスプレッダとしての機能を有する。
【選択図】図1
Description
図16は半導体装置の要部断面模式図である。
このように、IGBT素子104等を搭載した半導体装置100では、各部位間の電気的接続を確保するために、ワイヤによるボンディングが行われている。
また、Pバスバー用のリードフレーム23とNバスバー用のリードフレーム24とが並行して配置されているので、電流によって発生する磁界が打ち消し合い、インダクタンスが低下する。その結果、大きなサージ電圧が印加されなくなり、回路の誤動作を防止し、半導体素子の破壊を防止することができる。
図2はパワーセル製造工程の要部模式図であり、(A)はパワーセルの要部上面模式図であり、(B)はパワーセルの要部断面模式図である。ここで、(B)は(A)の断面A−A’の位置に対応している。
次いで、Cu箔14の上に、それぞれ2個のIGBT素子15及びFWD素子16を半田17を介して、半田付けする。そして、IGBT素子15及びFWD素子16の上に、ヒートスプレッダ19aを半田18を介して半田付けする。この状態で、Cu箔14は、IGBT素子15のコレクタ電極及びFWD素子16のカソード側に電気的に接続されている。また、ヒートスプレッダ19aは、IGBT素子15のエミッタ電極及びFWD素子16のアノード側に電気的に接続されている。
図3はパワーセルのCuベース上への実装工程を説明する要部上面模式図である。
次に、上記のリードフレームが実装されていない半導体装置10に嵌合するリードフレームを備えた樹脂ケースの構造について説明する。
以上の工程で、半導体装置10の完成に至る。
以下に、リードフレームの剛性を局所的に低下させることのできる構造について説明する。
この図に示すように、リードフレーム40の厚みが一部分において薄くなるように、少なくともリードフレームの上面または下面に凹部40a,40bを設ける。これにより、リードフレーム40の剛性を局所的に低下させることができる。
この図に示すように、リードフレーム41の一部分に貫通するスリット41aを少なくともひとつ設ける。これにより、リードフレーム41の剛性を局所的に低下させることができる。
この図に示すように、リードフレーム42の一部分にディンプル42aを少なくともひとつ設ける。そして、そのディンプル42aは、少なくともリードフレームの上面または下面に形成する。これにより、リードフレーム42の剛性を低下させることができる。
この図に示すように、リードフレーム43の一部分の側面にU字状の括れ部43aを設ける。これにより、リードフレーム43の剛性を局所的に低下させることができる。
この図に示すように、リードフレーム43の一部分の側面に、少なくともひとつのU字状の括れ部43aをリードフレーム43の一部分の側面に設ける。特に、リードフレーム43の両側面に括れ部43aを設けた場合は、両側面に配設した括れ部43aを対向させず、両側面の配置位置の位相をずらすことで弾性が増加し、且つリードフレーム43の剛性を局所的に低下させることができる。
この図に示すように、リードフレーム44の一部分の側面に少なくともひとつの矩形状の括れ部44aをリードフレーム44の一部分の側面に設ける。これにより、リードフレーム44の剛性を局所的に低下させることができる。
図12は半導体装置の要部模式図であり。(A)は半導体装置の要部上面模式図であり、(B)はリードピンと端子との溶接状態を説明する要部断面模式図である。ここで(B)は、一つのパワーセルの拡大した断面図であり、リードフレーム及び樹脂ケースについては略されている。そして、(B)は(A)の断面A−A’の位置に対応している。また、この図においては、図1及び図5に示す要素と同一の要素については同一の符号を付し、その説明の詳細は省略する。
この図に示すように、複数のリードピン29を一体的に樹脂28bに封止し、固定する。そして、樹脂28bで封止したリードピンユニット60を樹脂ケース28の所定の位置に嵌合させ、成形により樹脂ケース28に固定させる。
また、リードピン29を直接接合する金属端子台についても、その数が多く、上述したIGBT素子の上に金属端子台を個別に接合すると手間がかかり、作業効率が低下する。そこで、複数の金属端子台を絶縁材料により予め封止した金属端子台ユニットを形成する。
最後に、リードフレームに傾斜構造の角度と、溶接で用いるレーザー光の開口角の関係について説明する。
この図に示すように、リードフレーム45の傾斜角Yは、照射するレーザー光の開口角Xより、広角になるように傾斜させる。即ち、リードフレーム45の溶接部45b以外の部分は、レーザー光によって照射されない構造を有している。従って、レーザーユニット81から発せられるレーザー光80がリードフレーム45の傾斜面45aに照射されず、傾斜面45aの溶解及び熱膨張による溶接中のリードフレーム45の変形を防止することができる。
11 Cuベース
12,14,14a,14b,14c,14d,14e,14f Cu箔
13 絶縁基板
15 IGBT素子
15b 金属端子台
16 FWD素子
15a,17,18 半田
19a,19b,19c,19d,19e,19f ヒートスプレッダ
20 端子
21 アルミワイヤ
22 電極端子
23,24,25,26,27,40,41,42,43,44,45 リードフレーム
23a,23b,23c,24a,24b,24c,25a,25b,26a,26b,27a,27b,29a,45b 溶接部
28 樹脂ケース
28a 側壁
28b,28c 樹脂
29 リードピン
30 パワーセル
40a,40b 凹部
41a スリット
42a ディンプル
43a,44a 括れ部
45a 傾斜面
60 リードピンユニット
70 金属端子台ユニット
80 レーザー光
81 レーザーユニット
Claims (20)
- 少なくとも1つの半導体素子を搭載した半導体装置において、
前記半導体装置内の電気的接続を複数の導体板によって行い、
前記複数の導体板に設けたそれぞれの溶接部がレーザー溶接で用いるレーザー光源に向けて露出するように、前記複数の導体板が立体的に配置されていることを特徴とする半導体装置。 - 前記複数の導体板の少なくとも一つが前記半導体装置の出力導体であり、前記半導体素子の電極、前記半導体素子を搭載した基板の回路パターンの少なくとも1つにレーザー溶接することを特徴とする請求項1記載の半導体装置。
- 前記複数の導体板の少なくとも一つが前記半導体装置の入力導体であり、前記半導体素子の電極、前記半導体素子を搭載した基板の回路パターンの少なくとも1つにレーザー溶接することを特徴とする請求項1記載の半導体装置。
- 前記半導体素子の電極は、前記半導体素子の電極層に接合されたヒートスプレッダであることを特徴とする請求項2または3記載の半導体装置。
- 前記複数の導体板の少なくとも一つが前記半導体素子の制御端子に接続されるリードピンであり、前記リードピンが前記半導体素子を搭載した基板の前記制御端子に電気的に接続された回路パターンにレーザー溶接されることを特徴とする請求項1記載の半導体装置。
- 前記半導体装置が樹脂で封止されていることを特徴とする請求項1記載の半導体装置。
- 前記導体板の一部分が前記樹脂によって固定されていることを特徴とする請求項6記載の半導体装置。
- 前記導体板の前記溶接部以外の部分が傾斜構造を構成することを特徴とする請求項1記載の半導体装置。
- 前記導体板の前記溶接部にレーザー光を照射させた場合、前記導体板の前記溶接部以外の部分が前記レーザー光によって照射されないように、前記導体板が傾斜していることを特徴とする請求項1記載の半導体装置。
- 前記導体板の少なくとも上面または下面に前記導体板の厚みに差を設けるための凹部が形成されていることを特徴とする請求項1記載の半導体装置。
- 前記導体板に少なくとも一つのスリットが形成されていることを特徴とする請求項1記載の半導体装置。
- 前記導体板の少なくとも上面または下面に、少なくとも一つのディンプルが形成されていることを特徴とする請求項1記載の半導体装置。
- 前記導体板の側面に、少なくとも一つのU字状の括れ部が形成されていることを特徴とする請求項1記載の半導体装置。
- 前記導体板の側面に、少なくとも一つの矩形状の括れ部が形成されていることを特徴とする請求項1記載の半導体装置。
- 複数の前記リードピンが樹脂によって一体的に固定されたリードピンユニットを形成していることを特徴とする請求項1または5記載の半導体装置。
- 前記半導体素子の前記制御端子上に金属端子台が形成され、前記リードピンが、前記金属端子台にレーザー溶接されることを特徴とする請求項1記載の半導体装置。
- 複数の前記金属端子台が絶縁材料によって一体的に固定された金属端子台ユニットを形成していることを特徴とする請求項16記載の半導体装置。
- 少なくとも1つの半導体素子を搭載した半導体装置内の電気的接続を複数の導体板のレーザー溶接によって行う半導体装置の製造方法において、
前記複数の導体板に設けたそれぞれの溶接部を前記レーザー溶接で用いるレーザー光源に向けて露出するように、前記複数の導体板を立体的に配置する工程と、
前記それぞれの溶接部にレーザー光を照射する工程と、
を有することを特徴とする半導体装置の製造方法。 - 前記複数の導体板を立体的に配置する工程は、
前記導体板の一部分を樹脂に一体に成型する工程と、
前記半導体素子を搭載した基板に、樹脂ケースを載置する工程であることを特徴とする請求項18記載の半導体装置の製造方法。 - 前記導体板の一部分を前記樹脂に一体に成型する工程は、
前記半導体素子の制御端子に電気的に接続されるリードピンの複数を、前記樹脂によって一体的に固定してリードピンユニットを形成する工程と、
前記リードピン以外の複数の導体板と前記リードピンユニットとを前記樹脂ケースに一体に成型する工程であることを特徴とする請求項19記載の半導体装置の製造方法。
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Also Published As
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US7705443B2 (en) | 2010-04-27 |
DE102007049481A1 (de) | 2008-04-17 |
DE102007049481B4 (de) | 2021-04-01 |
US20080150102A1 (en) | 2008-06-26 |
JP5076440B2 (ja) | 2012-11-21 |
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