JP5832557B2 - 電力用半導体装置 - Google Patents
電力用半導体装置 Download PDFInfo
- Publication number
- JP5832557B2 JP5832557B2 JP2013555039A JP2013555039A JP5832557B2 JP 5832557 B2 JP5832557 B2 JP 5832557B2 JP 2013555039 A JP2013555039 A JP 2013555039A JP 2013555039 A JP2013555039 A JP 2013555039A JP 5832557 B2 JP5832557 B2 JP 5832557B2
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- Prior art keywords
- power semiconductor
- sealing resin
- partition wall
- semiconductor element
- semiconductor device
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Description
図1は、本発明の実施の形態1による電力用半導体装置の基本構造を示す断面図、図2はケース側板、ベース板などを省略し、封止樹脂を取り除いて示す斜視図である。絶縁基板1の上面に表面電極パターン2、裏面に裏面電極パターン3が貼られた半導体素子基板4の表面電極パターン2の表面に電力用半導体素子5および電力用半導体素子6がはんだなどの接合材7で固着されている。ここで、例えば電力用半導体素子5は大電流を制御するMOSFETのような電力用半導体素子であり、電力用半導体素子6は例えば電力用半導体素子5に並列に設けられる還流用のダイオードである。この電力用半導体素子5および電力用半導体素子6を囲むように、表面電極パターン2上に区画壁9が備えられ、この区画壁9の表面電極パターン2に接合されていない面の少なくとも一箇所に中継端子用電極8が形成されている。半導体素子基板4は裏面電極パターン3側がベース板10にはんだなどの接合材70で固着されており、このベース板10が底板となり、ベース板10にケース側板11を設置することでケースが形成される。このケース内の区画壁9内に第一の封止樹脂120を注入してモールドされ、その後さらに、ケース内に第二の封止樹脂12を注入してモールドされる。各電力用半導体素子には各電力用半導体素子の電極などを外部に電気接続するための太ワイヤの配線13や細ワイヤの配線130が接続されている。この外部への接続は、表面電極パターン2や区画壁9上に設けられた中継端子用電極8を中継し、端子14を介して行われる。
実施の形態2では、区画壁9上の中継端子用電極8の位置について記述する。中継端子用電極8は、区画壁9の表面電極パターン2と導通が無く、必要な絶縁距離を確保できる部位に設けることができる。図3は本発明の実施の形態2による電力用半導体装置の基本構造の一例を示す断面図であり、図1、図2と同一符号は同一または相当する部分を示す。図3の電力用半導体装置は、区画壁9の上面の内側を一部低くし、その部分に中継端子用電極8を設けて、中継端子用電極8を第一の封止樹脂120中に埋没させた構造である。この場合、細ワイヤの配線130の長さを短くすることができ、さらに細ワイヤの配線130を第一の封止樹脂120で全て被覆できるため、断線に対する耐性が向上し、信頼性の高い電力用半導体装置が提供できる。また、絶縁基板1上には電極で回路パターンを形成せず、区画壁9上に中継端子用電極8を設けることで縦方向に回路形成する構造をとるため、絶縁基板1が横方向に広がらずモジュールサイズの小型化が図れる。さらに、区画壁9は絶縁物で形成されているため十分に電極間距離が確保できるため高耐圧化が図れる。
本実施の形態3では、実施の形態2における図5に示す電力用半導体装置における区画壁9の作製方法について記述する。ここで、区画壁9は本発明の範囲に於いて任意の形状をとることができ、図5の構造に限定されるものではない。すなわち、基本的な製造方法は本実施の形態3のとおりであるが、中継端子用電極8の位置、数、面積等は用いる区画壁9に最適な条件で作成することができる。
本実施の形態3では、試験用の半導体装置モジュールを、種々の材料を用いた区画壁や封止樹脂により作製し、パワーサイクル試験やヒートサイクル試験を行った結果を実施例として示す。
まず、本発明による図5の構造の電力用半導体装置、および図8に示す比較例の電力用半導体装置を作製し、ヒートサイクル試験を実施した。ヒートサイクル試験の評価は、ヒートサイクル試験の実施前後でPDIV(PD Inception Voltage:部分放電開始電圧)測定を実施することにより行った。比較例の電力用半導体装置は、図8に示すような、従来技術に相当する構造の電力用半導体装置である。図8は、図2と同様、ケース側板、ベース板などを省略し、封止樹脂を取り除いて示しているが、比較例の電力用半導体装置はケース側板とベース板に囲まれたケース内を、封止樹脂で封止した構造となっている。比較例の電力用半導体装置は、図8に示されるように、区画壁を用いず、表面電極パターン2とは電気的に絶縁され、絶縁基板1上に表面電極パターン2と同様に形成された中継端子用電極パターン21により配線13と配線15とを中継する構造となっている。また封止樹脂の材料は、比較対象である本発明による図5の構造の電力用半導体装置の第一の封止樹脂と同じ材料を用いた。
本実施例2では、図5の構造で、種々の弾性率の第二の封止樹脂の半導体装置を作製し、パワーサイクル試験およびヒートサイクル試験を実施した。表2には、第一の封止樹脂120に弾性率が7.0GPaのサンユレック製EX-550を用い、第二の封止樹脂12の弾性率を変えたときのパワーサイクル試験およびヒートサイクル試験の結果を示す。
本実施例3では、図5の構造で、種々の弾性率の第一の封止樹脂120の半導体装置を作製し、パワーサイクル試験およびヒートサイクル試験を実施した。表3に、区画壁9に信越化学製KE1833(弾性率3.5MPa)を用い、第二の封止樹脂12として、東レダウコーニング製SE1886(弾性率30kPa)を用いて、第一の封止樹脂120の弾性率を変えたときの
パワーサイクル試験およびヒートサイクル試験の結果を示す。
本実施例4では、図5の構造で、樹脂の封止高さを振ることで半導体素子と区画壁9上の中継端子用電極8を接続する配線の被覆率を変えた電力用半導体装置を作製し、ヒートサイクル試験を実施した。試験の評価は、ワイヤの断線が発生するまでのヒートサイクル回数で評価した。第一の封止樹脂120として、サンユレック製EX-550にシリカフィラーを15wt%添加し、弾性率を12GPaに調整した封止樹脂を使用し、第二の封止樹脂12として、東レダウコーニング製SE1886(弾性率30kPa)を用いた以外は、実施例2と同様のものを用いた。
3:裏面電極パターン 4;半導体素子基板
5、6:電力用半導体素子 7、70:接合材
8:中継端子用電極 9:区画壁
10:ベース板 11:ケース側板
12:第二の封止樹脂 13:太ワイヤの配線
120:第一の封止樹脂 130:細ワイヤの配線
Claims (8)
- 絶縁基板の片面に表面電極パターンが、および前記絶縁基板の他の面に裏面電極パターンが、それぞれ形成された半導体素子基板と、
前記表面電極パターンの、前記絶縁基板とは反対側の面に接合材を介して固着された電力用半導体素子と、
前記電力用半導体素子を囲むように、前記表面電極パターン上に接合されて設けられた区画壁と、
この区画壁の内側に満たされ、前記電力用半導体素子および前記区画壁内の前記表面電極パターンを覆う第一の封止樹脂と、
前記区画壁と、前記第一の封止樹脂と、前記区画壁から外に露出した前記半導体素子基板とを覆う第二の封止樹脂と、を備え、
前記第二の封止樹脂の弾性率は、前記第一の封止樹脂の弾性率よりも小さく設定され、
前記区画壁に、前記表面電極パターンと導通が無いように中継端子用電極を備え、
前記区画壁内から前記区画壁外への配線を、前記中継端子用電極を介して引き出したことを特徴とする電力用半導体装置。 - 前記第一の封止樹脂の弾性率は1GPa以上20GPa以下、線膨張率は10ppm以上30ppm以下であることを特徴とする請求項1に記載の電力用半導体装置。
- 前記区画壁と前記第一の封止樹脂の線膨張率の差が50ppm以下であることを特徴とする請求項1に記載の電力用半導体装置。
- 前記第二の封止樹脂の弾性率は30kPa以上3GPa以下であることを特徴とする請求項1に記載の電力用半導体装置。
- 前記電力用半導体素子と前記中継端子用電極を接続する配線のうち少なくとも一部の配線が、その他の配線よりも細いことを特徴とする請求項1に記載の電力用半導体装置。
- 前記その他の配線よりも細い配線の断面積は0.018mm2以下であり、この配線の前記第一の封止樹脂による被覆率は少なくとも50%であることを特徴とする請求項5に記載の電力用半導体装置。
- 前記電力用半導体素子がワイドバンドギャップ半導体により形成されていることを特徴とする請求項1に記載の電力用半導体装置。
- 前記ワイドバンドギャップ半導体は、炭化珪素、窒化ガリウム系材料、ダイアモンドのうちのいずれかの半導体であることを特徴とする請求項7に記載の電力用半導体装置。
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US11961807B2 (en) | 2018-12-20 | 2024-04-16 | Silicon Works Co., Ltd. | Semiconductor package |
KR102693773B1 (ko) | 2018-12-20 | 2024-08-13 | 주식회사 엘엑스세미콘 | 반도체 패키지 |
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DE112012005746B4 (de) | 2021-02-18 |
CN104054173A (zh) | 2014-09-17 |
US9343388B2 (en) | 2016-05-17 |
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WO2013111276A1 (ja) | 2013-08-01 |
JPWO2013111276A1 (ja) | 2015-05-11 |
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