JP2015029022A - 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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- JP2015029022A JP2015029022A JP2013158233A JP2013158233A JP2015029022A JP 2015029022 A JP2015029022 A JP 2015029022A JP 2013158233 A JP2013158233 A JP 2013158233A JP 2013158233 A JP2013158233 A JP 2013158233A JP 2015029022 A JP2015029022 A JP 2015029022A
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Abstract
【解決手段】半導体装置は、チップ搭載面に形成された複数のボンディングフィンガ(端子)BFを有する配線基板3と、配線基板3に搭載される半導体チップと、ボール部Bnd1およびステッチ部Bnd2をそれぞれ有する複数のワイヤBWと、を含んでいる。複数のボンディングフィンガBFは、ワイヤBWaのステッチ部Bnd2がそれぞれ接続されたボンディングフィンガBF1と、ワイヤBWbのボール部Bnd1が接続されたボンディングフィンガBF2と、を有している。また、平面視において、ボンディングフィンガBF2は、複数のボンディングフィンガBF1の配置列Bd1上とは異なる位置に配置され、ボンディングフィンガBF2の幅W2は、ボンディングフィンガBF1の幅W1よりも大きい。
【選択図】図7
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。
まず、本実施の形態の半導体装置1の構成の概要について、図1〜図4を用いて説明する。本実施の形態の半導体装置1は、複数の半導体チップ2(図3、図4参照)、および複数の半導体チップ2が搭載された配線基板3を有する。図4に示すように複数の半導体チップ2は、配線基板3の上面(チップ搭載面)3a側に積み重なるように搭載され、それぞれ、封止体(樹脂体)4により覆われている。
次に、図3および図4に示すワイヤBWによる電気的接続部分の詳細構造について説明する。図5は、図3に示す複数のワイヤのうち、下段側の半導体チップと配線基板とを電気的に接続するワイヤを示す拡大断面図である。また、図6は、図3に示す複数のワイヤのうち、上段側の半導体チップと配線基板とを電気的に接続するワイヤを示す拡大断面図である。また、図7は、図3に示す配線基板のチップ搭載面側の平面において、ボンディングフィンガの配置密度が高い領域を拡大して示す拡大平面図である。また、図8は、図7に示す領域よりもボンディングフィンガの配置密度が低い領域を拡大して示す拡大平面図である。また、図27、図29、図30のそれぞれは、ボンディングフィンガの形状や大きさが図7に示す実施態様とは異なる実施態様を示す拡大平面図である。また、図28は図27のA−A線に沿った拡大断面図である。
次に、図1〜図8を用いて説明した半導体装置1の製造方法について、説明する。本実施の形態の半導体装置1、図9に示す組立てフローに沿って製造される。図9は、本実施の形態の半導体装置の組み立てフローを示す説明図である。
まず、図9に示す基板準備工程では、図10に示すような配線基板25を準備する。図10は、図9に示す基板準備工程で準備する配線基板の全体構造を示す平面図である。また、図11は、図10に示す複数のデバイス形成部のうちの一つにおいて、図7に示す領域に対応する部分の拡大平面図である。
また、図9に示す半導体チップ準備工程では、図4に示す複数の半導体チップ2、すなわち、アナログチップFCおよびコントローラチップCCを準備する。本工程では、例えば、シリコンからなる半導体ウエハ(図示は省略)の主面側に、複数の半導体素子やこれに電気的に接続される配線層からなる半導体ウエハを準備する。アナログチップFCにはアナログ回路が、コントローラチップCCにはアナログ回路を制御する制御回路が、それぞれ形成される。
次に、図9に示すダイボンディング工程では、図12および図13に示すように、配線基板25のデバイス形成部25aのチップ搭載面上に、半導体チップ2を搭載し、接着固定する。図12は、図10に示す配線基板上に半導体チップを搭載した状態を示す拡大平面図、図13は図12のA−A線に沿った拡大断面図である。
次に、図9に示すワイヤボンディング工程では、図14および図15に示すように、半導体チップ2の複数のパッドPDと、配線基板25の複数のボンディングフィンガBFとを、複数のワイヤBWを介して電気的に接続する。図14は、図12に示す複数の半導体チップのそれぞれと配線基板とを、ワイヤボンディングにより電気的に接続した状態を示す拡大平面図、図15は、図13に示す半導体チップと配線基板を、ワイヤボンディングにより電気的に接続した状態を示す拡大断面図である。なお図15では、正ボンディング方式のワイヤBWaと逆ボンディング方式のワイヤBWbとのループ形状の違いを示すため、ワイヤBWbについて、二点鎖線を付して示している。以降の断面図についても同様である。また、図16は、正ボンディング方式の第1ボンド側において、ボール部をパッドに接合した状態を示す拡大断面図である。また、図17は、正ボンディング方式の第2ボンド側において、ステッチ部をボンディングフィンガに接合した状態を示す拡大断面図である。また、図18は、逆ボンディング方式の第1ボンド側において、ボール部をボンディングフィンガに接合した状態を示す拡大断面図である。また、図19は、逆ボンディング方式の第2ボンド側において、ステッチ部をバンプ電極に接合した状態を示す拡大断面図である。
次に、図9に示す封止工程では、図20に示すように、半導体チップ2および複数のワイヤBWを樹脂で封止する。図20は図15に示す半導体チップおよび複数のワイヤを樹脂で封止した状態を示す拡大断面図である。
次に、図9に示す半田材形成工程では、図21に示すように、ランドLDのそれぞれの露出面を覆うように、半田材7を形成する。図21は、図20に示す複数のランドのそれぞれの露出面に半田を形成した状態を示す拡大断面図である。
次に、図9に示す個片化工程では、図22に示すように、配線基板25のデバイス形成部25a毎に分割し、複数の半導体装置1を取得する図22は、図21に示す配線基板をダイシングブレードで切断した状態を示す拡大断面図である。
以上、本願発明者によってなされた発明を実施の形態に基づき具体的に説明したが、本発明は前記実施の形態に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能であることはいうまでもない。
図7に示す例では、複数のボンディングフィンガBFのうち、ボールボンディング方式用のボンディングフィンガBF2は、平面形状が円形である。ボンディングフィンガBF2の平面形状を円形にすれば、ボール部Bnd1との密着面積を最大化し、かつ、ボンディングフィンガBF2の占有面積を最小化することができる。しかし、ボンディングフィンガBF2の平面形状は、例えば四角形や五角形の多角形等、種々の変形例がある。図23に示す変形例の半導体装置1Aが有するボンディングフィンガBF2は、平面形状が円形を成す円形部Fp1と、円形部Fp1に連結され、ワイヤBWの延在方向に沿って延びる延在部Fp2と、を有している。図23は、図7に対する変形例を示す拡大平面図である。
また、例えば、一つのパッケージ内に正ボンディング方式により形成されるワイヤBWaと逆ボンディング方式により形成されるワイヤBWbが混在する例として、複数の半導体チップ2が積層されている実施態様について説明した。しかし、パッケージ内に配置される半導体チップ2が一つのみの場合であっても、一つのパッケージ内に正ボンディング方式により形成されるワイヤBWaと逆ボンディング方式により形成されるワイヤBWbが混在させる場合がある。図24は、図3に示す半導体装置に対する変形例において、半導体チップが有する複数のパッドと配線基板の複数のボンディングフィンガの接続関係を模式的に示す拡大平面図である。また、図25は、図24に対する変形例を示す拡大平面図である。また、図26は、図24に対する他の変形例を示す拡大平面図である。
また例えば、上記実施の形態では、半導体チップ2の四辺に沿って配置される複数のボンディングフィンガ群のうちの一部のボンディングフィンガ群において、ボンディングフィンガBFの配置密度が大きくなる実施態様について説明した。しかし、変形例としては、例えば、半導体チップ2の四辺に沿って配置されるボンディングフィンガ群のそれぞれについて、ボンディングフィンガBFの配置密度が高い場合にも適用できる。複数のボンディングフィンガ群において、ボンディングフィンガBFの配置密度が高く、かつ、正ボンディング方式のワイヤBWaと逆ボンディング方式のワイヤBWbとが混在する場合には、複数のボンディングフィンガ群のそれぞれについて上記実施の形態で説明した技術を適用することが好ましい。
また例えば、上記実施の形態では、図7に示すように、一つのボンディングフィンガ群に、複数のボンディングフィンガBF1および複数のボンディングフィンガBF2を設けた実施態様について説明したが、逆ボンディング方式で接続されるボンディングフィンガBF2が一つの場合でも適用できる。
また例えば、上記実施の形態では、半導体チップ2までの距離が相対的に近い、第1列目の配置列Bd1にボンディングフィンガBF1を配置し、半導体チップ2までの距離が配置列Bd1よりも遠い第2列目の配置列Bd2にボンディングフィンガBF2を配置している。しかし、変形例としては、逆ボンディング用のボンディングフィンガBF2をボンディングフィンガBF1よりも半導体チップ2に近い位置に配置することもできる。逆ボンディング方式の場合、ワイヤBWの一部は、ボンディングフィンガBF上に延びるように形成されるので、正ボンディング方式の場合と比較して、ボンディングフィンガBFの位置を半導体チップ2に近づけることができる。したがって、逆ボンディング用のボンディングフィンガBF2を半導体チップ2に近づければ、ボンディングフィンガBF2とボンディングフィンガBF1の離間距離を大きくすることができる。この結果、ボンディングフィンガBF1に接続されるワイヤBWaが逆ボンディング用のボンディングフィンガBF2に接触することを抑制できる。また、ボンディングフィンガBF2を半導体チップ2に近づけることにより、ボンディングフィンガBF1から半導体チップ2までの距離が増大することを抑制できるので、平面サイズの増大も抑制できる。
さらに、上記実施の形態で説明した技術思想の要旨を逸脱しない範囲内において、変形例同士を組み合わせて適用することができる。
2 半導体チップ
2a 表面(主面、上面)
2b 裏面(主面、下面)
2c 側面
3 配線基板
3a 上面(チップ搭載面)
3b 下面(実装面)
3c 側面
3e 絶縁層(コア絶縁層)
3h ソルダレジスト膜(絶縁膜)
3p 給電線
3r 配線
4 封止体(樹脂体)
4a 上面
4b 下面
4c 側面
5、6 ダイボンド材(接着材)
7 半田材
25 配線基板
25a デバイス形成部
25b 枠部
25c ダイシング部(ダイシングライン)
Bd1 配置列(第1列目の配置列)
Bd2 配置列(第2列目の配置列)
BF ボンディングフィンガ(端子、チップ搭載面側端子、ボンディングリード)
BF1 ボンディングフィンガ(ステッチボンディング用のボンディングフィンガ、正ボンディング方式用のボンディングフィンガ)
BF2 ボンディングフィンガ(ボールボンディング用のボンディングフィンガ、逆ボンディング方式用のボンディングフィンガ)
BMP バンプ電極(突起電極、導電性部材)
Bnd1 ボール部
Bnd2 ステッチ部
BW ワイヤ(導電性部材)
BWa ワイヤ(正ボンディング方式のワイヤ)
BWb ワイヤ(逆ボンディング方式のワイヤ)
CC コントローラチップ(半導体チップ)
CP キャピラリ
CP1、CP2、CP3、CP4、CP5 矢印
DBL ダイシングブレード(回転刃)
FC アナログチップ(半導体チップ)
Fp1 円形部(部分)
Fp2 延在部(部分)
L1、L2、L3 延在方向の長さ
LD ランド(外部端子、電極パッド、外部電極パッド)
PD、PD1、PD2 複数のパッド(端子、電極、電極パッド、ボンディングパッド)
S1、S2、S3、S4 辺
SR ソルダレジスト膜(絶縁膜)
SRp 開口部
W1、W2、W3、W4、Wbt、Wtp 幅
Claims (19)
- チップ搭載面、前記チップ搭載面に形成された複数の端子、および前記チップ搭載面とは反対側の実装面を有する配線基板と、
第1主面、前記第1主面上に形成された複数の第1電極、および前記第1主面とは反対側の第1裏面を有し、前記第1裏面が前記配線基板の前記チップ搭載面と対向するように、前記チップ搭載面上に搭載された第1半導体チップと、
ボール部およびステッチ部をそれぞれ有し、前記複数の端子にそれぞれ接続された複数のワイヤと、
を含み、
前記複数のワイヤは、前記複数の端子側に前記ステッチ部が接続された複数の第1ワイヤと、前記複数の端子側に前記ボール部が接続された第2ワイヤと、を有し、
前記複数の端子は、前記複数の第1ワイヤの前記ステッチ部がそれぞれ接続された複数の第1端子と、前記第2ワイヤの前記ボール部が接続された第2端子と、を有し、
平面視において、前記第2端子は、前記複数の第1端子の配置列上とは異なる位置に配置されており、
平面視において、前記第2端子の幅は、前記複数の第1端子のそれぞれの幅よりも大きい、半導体装置。 - 請求項1において、
平面視において、前記第2端子の延在方向における長さは、前記複数の第1端子のそれぞれの延在方向における長さよりも小さい、半導体装置。 - 請求項1において、
平面視において、前記第2ワイヤの前記ボール部の幅は、前記第1ワイヤの前記ステッチ部の幅よりも大きい、半導体装置。 - 請求項1において、
前記第1半導体チップの前記第1主面上には、
前記第1半導体チップの前記第1主面と対向する第2裏面、前記第2裏面とは反対側の第2主面、および前記第2主面上に形成された第2電極、を有する第2半導体チップが搭載され、
前記複数の第1ワイヤの前記ボール部のそれぞれは、前記第1半導体チップの前記複数の第1電極に接続され、
前記第2ワイヤの前記ステッチ部は、前記第2半導体チップの前記第2電極に接続されている、半導体装置。 - 請求項1において、
前記第2端子の平面形状は円形である、半導体装置。 - 請求項1において、
前記配線基板の前記チップ搭載面は、絶縁膜に覆われ、前記複数の第1端子および前記第2端子は、前記絶縁膜に形成された一つの開口部において、前記絶縁膜から露出している、半導体装置。 - 請求項1において、
前記第1半導体チップは、前記第1主面の第1辺に沿って配置される前記複数の第1電極、および第2電極を有し、
前記複数の第2電極と前記第1辺の離間距離は、前記複数の第1電極のそれぞれと前記第1辺の離間距離よりも大きく、
前記複数の第1ワイヤの前記ボール部のそれぞれは、前記複数の第1電極に接続され、
前記第2ワイヤの前記ステッチ部は、前記第2電極に接続されている、半導体装置。 - 請求項1において、
前記第1半導体チップは、前記第1主面の第1辺に沿って配置される前記複数の第1電極、および第2電極を有し、
前記複数の第1ワイヤの前記ボール部のそれぞれは、前記複数の第1電極に接続され、
前記第2ワイヤの前記ステッチ部は、前記第2電極に接続され、
前記配線基板の前記チップ搭載面は、絶縁膜に覆われ、前記複数の第1端子および前記第2端子は、前記絶縁膜に形成された一つの開口部において、前記絶縁膜から露出しており、
前記開口部には、前記第2ワイヤに流れる電流とは異なる電流が流れる第1配線が配置されており、
平面視において、前記第2ワイヤは前記開口部と厚さ方向に重なる位置で、前記第1配線を跨ぐように設けられている、半導体装置。 - 請求項1において、
前記第1半導体チップは、前記第1主面の第1辺に沿って配置される前記複数の第1電極、および第2電極を有し、
前記複数の第1ワイヤの前記ボール部のそれぞれは、前記複数の第1電極に接続され、
前記第2ワイヤの前記ステッチ部は、前記第2電極に接続され、
前記第2ワイヤは、前記複数の第1ワイヤのうちの一部を跨ぐように設けられている、半導体装置。 - 請求項1において、
平面視において、前記複数の第1端子のそれぞれの延在方向における長さは、前記複数の第1端子のそれぞれの幅よりも大きい、半導体装置。 - 請求項1において、
前記第2端子は、平面形状が円形であり、前記第2ワイヤの前記ボール部が接続される第1部分と、前記第1部分に連結され、前記第2ワイヤの延在方向に沿って延びる第2部分と、を有し、
前記第2端子の前記第2部分は、前記複数の第1端子の配置列上に設けられている、半導体装置。 - 請求項1において、
平面視において、前記複数の第1端子のそれぞれは前記第2端子よりも前記第1半導体チップに近い位置に形成されている、半導体装置。 - (a)チップ搭載面、および前記チップ搭載面に形成された複数の端子を有する配線基板を準備する工程、
(b)主面、前記主面上に形成された複数の電極、および前記主面とは反対側の裏面を有する半導体チップを、前記半導体チップの前記裏面が前記配線基板の前記チップ搭載面と対向するように、前記配線基板の前記チップ搭載面上に搭載する工程、
(c)前記(b)工程の後、前記配線基板の複数の端子と、前記半導体チップの複数の電極とを複数のワイヤを介して、それぞれ電気的に接続する工程、
を含み、
前記複数の端子は、第1配置列上に配列される複数の第1端子と、前記第1配置列上とは異なる位置に配置される第2端子と、を有し
平面視において、前記第2端子の幅は、前記複数の第1端子のそれぞれの幅よりも大きく、
前記複数のワイヤは、前記複数の第1端子に接続される複数の第1ワイヤと、前記第2端子に接続される第2ワイヤと、を有し、
前記(c)工程には、
前記複数の第1ワイヤのそれぞれの一端部に形成されたボール部を前記複数の電極に接続した後、前記複数の第1ワイヤの他端部を前記複数の第1端子にそれぞれ接続し、ステッチ部を形成する第1ボンディング工程と、
前記第2ワイヤの一端部に形成されたボール部を前記第2端子に接続した後、前記第2ワイヤの他端部を前記複数の電極のうちの一部に接続する第2ボンディング工程と、
が含まれている、半導体装置の製造方法。 - 請求項13において、
平面視において、前記第2端子の延在方向における長さは、前記複数の第1端子のそれぞれの延在方向における長さよりも小さい、半導体装置の製造方法。 - 請求項13において、
前記配線基板の前記チップ搭載面は、絶縁膜に覆われ、前記複数の第1端子および前記第2端子は、前記絶縁膜に形成された一つの開口部において、前記絶縁膜から露出している、半導体装置の製造方法。 - (a)チップ搭載面、および前記チップ搭載面に形成された複数の端子を有する配線基板を準備する工程、
(b)第1主面、前記第1主面上に形成された複数の第1電極、および前記第1主面とは反対側の第1裏面を有する第1半導体チップを、前記第1半導体チップの前記第1裏面が前記配線基板の前記チップ搭載面と対向するように、前記配線基板の前記チップ搭載面上に搭載する工程、
(c)前記(b)工程の後、第2主面、前記第2主面上に形成された第2電極、および前記第2主面とは反対側の第2裏面を有する第2半導体チップを、前記第2半導体チップの前記第2裏面が前記第1半導体チップの前記第1主面と対向するように、前記第1半導体チップの前記第1主面上に搭載する工程、
(d)前記(c)工程の後、前記配線基板の複数の端子と、前記第1半導体チップの複数の第1電極および前記第2半導体チップの前記第2電極とを複数のワイヤを介して、それぞれ電気的に接続する工程、
を含み、
前記複数の端子は、第1配置列上に配列される複数の第1端子と、前記第1配置列上とは異なる位置に配置される第2端子と、を有し
平面視において、前記第2端子の幅は、前記複数の第1端子のそれぞれの幅よりも大きく、
前記複数のワイヤは、前記複数の第1端子に接続される複数の第1ワイヤと、前記第2端子に接続される第2ワイヤと、を有し、
前記(c)工程には、
前記複数の第1ワイヤのそれぞれの一端部に形成されたボール部を前記複数の第1電極に接続した後、前記複数の第1ワイヤの他端部を前記複数の第1端子にそれぞれ接続し、ステッチ部を形成する第1ボンディング工程と、
前記第2ワイヤの一端部に形成されたボール部を前記第2端子に接続した後、前記第2ワイヤの他端部を前記第2電極に接続する第2ボンディング工程と、
が含まれている、半導体装置の製造方法。 - 請求項16において、
平面視において、前記第2端子の延在方向における長さは、前記複数の第1端子のそれぞれの延在方向における長さよりも小さい、半導体装置の製造方法。 - 請求項16において、
前記配線基板の前記チップ搭載面は、絶縁膜に覆われ、前記複数の第1端子および前記第2端子は、前記絶縁膜に形成された一つの開口部において、前記絶縁膜から露出している、半導体装置の製造方法。 - 請求項16において、
平面視において、前記第2端子は、前記第1配置列よりも前記第1半導体チップからの距離が遠くなる位置に形成されており、
前記(d)工程では、前記第2ボンディング工程は、前記第1ボンディング工程の後で実施される、半導体装置の製造方法。
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CN201410352981.6A CN104347549B (zh) | 2013-07-30 | 2014-07-23 | 半导体器件及其制造方法 |
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US9281289B2 (en) | 2016-03-08 |
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TW201505145A (zh) | 2015-02-01 |
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