JP2013201169A - 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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- JP2013201169A JP2013201169A JP2012066997A JP2012066997A JP2013201169A JP 2013201169 A JP2013201169 A JP 2013201169A JP 2012066997 A JP2012066997 A JP 2012066997A JP 2012066997 A JP2012066997 A JP 2012066997A JP 2013201169 A JP2013201169 A JP 2013201169A
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Abstract
【解決手段】チップ搭載部TABに形成されている第1接合部分JU1に、吊りリードHLに形成されている第2接合部分JU2を嵌め込むことにより、チップ搭載部TABと吊りリードHLとを物理的に固定する。具体的に、第1接合部分JU1は、チップ搭載部TABの表面に設けられた凹部から構成されており、第2接合部分JU2は、吊りリードHLの一部を構成している。
【選択図】図8
Description
半導体装置を構成するパッケージの一形態として、例えば、QFP(Quad Flat Package)に代表されるように、リードフレームを使用することにより、パッケージ(半導体装置)を製造する技術が確立している。通常、リードフレームと、半導体チップを搭載するチップ搭載部(ヘッダ)は一体化して形成されていることが多いが、チップ搭載部の放熱効率を向上させるため、チップ搭載部をリードフレームよりも厚くする技術がある。この技術では、チップ搭載部の厚さとリードフレームの厚さが異なるため、チップ搭載部とリードフレームとを一体的に形成することが困難である。このことから、チップ搭載部とリードフレームとを別体で構成し、別々に構成されているチップ搭載部とリードフレームとを物理的に固定することが行なわれている。
図7は、本実施の形態における半導体装置PK1の構成を示す図である。図7において、半導体装置PK1の構成要素は、例えば、樹脂からなる封止体で封止されているが、図7では、封止体の内部の構成要素を説明するため、封止体を透視して示している。
本実施の形態における半導体装置PK1は、上記のように構成されており、以下では、さらに、半導体装置PK1の製造工程中で使用されるリードフレームLF1の構成について説明する。図9は、本実施の形態の半導体装置PK1を製造する際に使用されるリードフレームLF1の構成を示す平面図であり、図10は、図9のA−A線で切断した断面図である。また、図11は、チップ搭載部をリードフレームに固定する工程の流れを示すフローチャートである。図9に示すように、本実施の形態のリードフレームLF1は、中央部に別体で構成されるチップ搭載部TABが配置され、このチップ搭載部TABの周囲に複数のリードLDおよび吊りリードHLが配置されている。これらの複数のリードLDと吊りリードHLとは、タイバーで接続されている。このタイバーによって、樹脂封止する際、複数のリードLDの間の隙間から樹脂が漏れ出すことを防止することができる。そして、リードフレームLF1の一部を構成する吊りリードHLと、チップ搭載部TABとは、チップ搭載部TABに形成された凹部からなる第1接合部分JU1に、吊りリードHLと一体的に形成された第2接合部分JU2嵌め込むことにより、固定されている。具体的には、図10に示すように、チップ搭載部TABの一部領域に対してプレス加工やエッチング加工を施すことにより、チップ搭載部TABの上面(表面)に凹部からなる第1接合部分JU1を形成する(図11のS101)。そして、第1接合部分JU1を形成した位置に対応する位置に配置される吊りリードHLの一部に、例えば、折り曲げ加工によって第2接合部分JU2を設ける(図11のS102)。その後、第1接合部分JU1を形成したチップ搭載部TABの下面を押さえた(支えた)状態で、この第2接合部分JU2を第1接合部分JU1に嵌め込む(図11のS103)。これにより、第2接合部分JU2を第1接合部分JU1に嵌め込んだ状態で、チップ搭載部TABをリードフレームLF1の吊りリードHLに固定することができる。このようにして、本実施の形態では、チップ搭載部TABに形成された第1接合部分JU1に、吊りリードHLの一部を構成する第2接合部分JU2を嵌め込むことにより、互いに別体として分離されているチップ搭載部TABと吊りリードHLとを物理的に固定できることがわかる。
図12は、チップ搭載部TABのうち、凹部からなる第1接合部分JU1近傍の領域を拡大した図であり、第1接合部分JU1の上方には、吊りリードと一体化した第2接合部分JU2の断面が示されている。図12において、第1接合部分JU1の深さをT1とし、第1接合部分JU1の幅をW1としている。一方、第2接合部分JU2の厚さをT2とし、第2接合部分JU2の幅をW2としている。このとき、第1接合部分JU1の幅W1は、第2接合部分JU2の幅W2以上であり(幅W1≧幅W2)、具体的には、例えば、幅W1=幅W2+10μm〜20μmとなっている。また、第2接合部分JU2の幅W2は、第2接合部分JU2の厚さT2以上となっている(幅W2≧厚さT2)。さらに、第2接合部分JU2の厚さT2は、例えば、0.1mm〜0.25mmとなっている。
続いて、第2固定構造について説明する。図14(a)〜図14(c)は、第2固定構造を製造する過程を示す図である。このとき、第2固定構造において、第1接合部分JU1の深さをT1とし、第1接合部分JU1の幅をW1としている。一方、第2接合部分JU2の厚さをT2とし、第2接合部分JU2の幅をW2としている。ここで、第1接合部分JU1の幅W1は、第2接合部分JU2の幅W2以上であり(幅W1≧幅W2)である。また、第2固定構造は、第1接合部分JU1の深さT1と、第2接合部分JU2の厚さT2が、ほぼ等しいことを前提とした構造である。
次に、第3固定構造について説明する。図15(a)〜図15(b)は、第3固定構造を製造する過程を示す図である。第3固定構造は、第1接合部分JU1の深さT1と、第2接合部分JU2の厚さT2が、ほぼ等しいことを前提とした構造である。さらに、第3固定構造では、第1接合部分JU1を構成する凹部の幅と、第2接合部分JU2の幅が、ほぼ等しくなっている。
続いて、第4固定構造について説明する。図16(a)〜図16(c)は、第4固定構造を製造する過程を示す図である。第4固定構造は、第1接合部分JU1の幅W1よりも、第2接合部分JU2の幅W2が小さいことを前提とした構造である。
上述したように、本実施の形態において、互いに別体から構成されるチップ搭載部TABと吊りリードHLとを固定する技術として、例えば、第1固定構造〜第4固定構造を挙げることができる。これらの第1固定構造〜第4固定構造に共通する本質(特徴)は、凹部からなる第1接合部分JU1に、吊りリードHLの一部を構成する第2接合部分JU2に嵌め込むことにより、チップ搭載部TABを吊りリードHLに固定する点にある。
本実施の形態における半導体装置は、上記のように構成されており、以下に、その製造方法について説明する。
次に、変形例1について説明する。本変形例1では、チップ搭載部TABの角部に、チップ搭載部TABと吊りリードHLとの接続部を設けている例について説明する。
次に、変形例2について説明する。本変形例2では、チップ搭載部TABにワイヤ接続部WCNを設ける例について説明する。
次に、変形例3について説明する。本変形例3では、チップ搭載部TABの角部の延長上に、チップ搭載部TABと吊りリードHLとを接続する接続部を設ける例について説明する。
続いて、変形例4について説明する。本変形例4では、半導体チップCHP1上に別の半導体チップCHP2が搭載された半導体装置PK5について説明する。
CHP 半導体チップ
CHP1 半導体チップ
CHP2 半導体チップ
CL 中心線
CN 角
CNR 角部
EB エンボス部
HL 吊りリード
JU1 第1接合部分
JU2 第2接合部分
LD リード
LFP リードフレーム
LFP2 リードフレーム
LF1 リードフレーム
LF2 リードフレーム
LF3 リードフレーム
LF4 リードフレーム
MR 封止体
OP 開口部
PD パッド
PD1 パッド
PD2 パッド
PD3 パッド
PKP 半導体装置
PKP2 半導体装置
PK1 半導体装置
PK2 半導体装置
PK3 半導体装置
PK4 半導体装置
PK5 半導体装置
PS1 大パンチ
PS2 小パンチ
R1 封止領域
SD1 辺
SD2 辺
SDC1 辺
SDC2 辺
SL スリット
TAB チップ搭載部
T1 深さ
T2 厚さ
W ワイヤ
WCN ワイヤ接続部
WG 基準電位用ワイヤ
W1 幅
W2 幅
Claims (27)
- (a)表面に複数のパッドが形成された半導体チップと、
(b)前記半導体チップが搭載された上面と、前記上面とは反対側の下面と、を有する第1部材と、
(c)前記第1部材と固定された吊りリードと、
(d)前記第1部材の周囲に配置された複数のリードと、
(e)前記半導体チップに形成されている前記複数のパッドのそれぞれと、前記複数のリードのそれぞれとを電気的に接続する複数のワイヤと、
(f)前記半導体チップ、前記第1部材の一部、前記吊りリードの一部、前記複数のリードの一部、および、前記複数のワイヤを封止する封止体と、を有し、
前記第1部材には、凹部からなる第1接合部分が形成され、
前記吊りリードは、第2接合部分を含み、
前記第1部材と前記吊りリードの固定は、前記第1接合部分に前記第2接合部分を嵌め込むことにより行なわれていることを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第1部材と前記吊りリードの固定は、前記第1接合部分に前記第2接合部分を挿入して圧着することにより行なわれていることを特徴とする半導体装置。 - 請求項2に記載の半導体装置であって、
前記凹部の深さは、前記第2接合部分の厚さよりも大きいことを特徴とする半導体装置。 - 請求項3に記載の半導体装置であって、
前記第1接合部分の端部は潰されていることを特徴とする半導体装置。 - 請求項4に記載の半導体装置であって、
前記第2接合部分の端部は、前記第1接合部分の端部で覆われていることを特徴とする半導体装置。 - 請求項5に記載の半導体装置であって、
前記第1接合部分から露出している前記第2接合部分の上面領域の面積は、前記第1接合部分の底面の面積よりも小さいことを特徴とする半導体装置。 - 請求項2に記載の半導体装置であって、
前記凹部の側面間の幅の中には、前記凹部の底面の幅よりも大きいものが存在することを特徴とする半導体装置。 - 請求項7に記載の半導体装置であって、
前記第2接合部分の上面には、へこみ部が形成されていることを特徴とする半導体装置。 - 請求項8に記載の半導体装置であって、
前記へこみ部の高さは、前記第1接合部分の上面の高さよりも低いことを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第1接合部分を構成する前記凹部の幅は、前記第2接合部分の幅と等しいことを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第1接合部分を構成する前記凹部の幅は、前記第2接合部分の幅よりも大きく、
前記第1接合部分と前記第2接合部分との間に接着部材が介在することを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第2接合部分の幅は、前記第2接合部分の厚さ以上であることを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第2接合部分は、前記吊りリードの一部を構成していることを特徴とする半導体装置。 - 請求項13に記載の半導体装置であって、
前記第2接合部分の幅は、前記吊りリードの他の部分の幅よりも大きいことを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第1部材は、矩形形状をしており、
前記第1接合部分は、前記第1部材の角部領域に形成されていることを特徴とする半導体装置。 - 請求項15に記載の半導体装置であって、
前記第1部材は、ワイヤ接続部を有し、
前記半導体チップの前記複数のパッドの中には、基準電位を供給する基準電位供給用パッドが含まれており、
前記基準電位供給用パッドと前記ワイヤ接続部とは、基準電位供給用ワイヤで電気的に接続されていることを特徴とする半導体装置。 - 請求項16に記載の半導体装置であって、
前記ワイヤ接続部は、前記第1部材の上面領域のうち、前記半導体チップが搭載されているチップ搭載領域よりも外側の外縁領域に形成されていることを特徴とする半導体装置。 - 請求項17に記載の半導体装置であって、
前記半導体チップは、前記半導体チップの中心が、前記第1部材の中心線からずれるように配置されていることを特徴とする半導体装置。 - 請求項18に記載の半導体装置であって、
平面視において、前記チップ搭載領域と前記ワイヤ接続部の間の前記第1部材の上面領域には、スリットが形成されていることを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第1部材の下面のうち、前記第1接合部分と前記第2接合部分の接合領域に相対する前記第1部材の下面の領域は平坦であることを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第1接合部分と前記第2接合部分は、前記封止体で封止されていることを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第1部材の下面は、前記封止体から露出していることを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第1部材の厚さは、前記複数のリードの厚さ、および、前記吊りリードの厚さよりも厚いことを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記半導体チップの表面上に、さらに、別の半導体チップが搭載されていることを特徴とする半導体装置。 - (a)吊りリードと複数のリードとを有し、かつ、前記吊りリードと固定された第1部材とを有するリードフレームを準備する工程と、
(b)前記(a)工程後、前記第1部材上に、半導体チップを搭載する工程と、
(c)前記(b)工程後、前記半導体チップの表面に配置された複数のパッドのそれぞれと、前記複数のリードのそれぞれとを、ワイヤで電気的に接続する工程と、
(d)前記(c)工程後、前記半導体チップ、前記吊りリードの一部分、前記複数のリードの一部分、および、前記ワイヤを封止体により封止する工程と、
(e)前記(d)工程後、前記封止体から露出している前記吊りリードの一部分および前記複数のリードの一部分を切断する工程と、を有し、
前記第1部材と前記吊りリードの固定は、前記第1部材に形成された凹部からなる第1接合部分に、前記吊りリードの第2接合部分を嵌め込むことにより行なわれていることを特徴とする半導体装置の製造方法。 - 請求項25に記載の半導体装置の製造方法であって、
前記第1接合部分および前記第2接合部分は、前記封止体により封止されることを特徴とする半導体装置の製造方法。 - 請求項25に記載の半導体装置の製造方法であって、
前記第1接合部分および前記第2接合部分は、前記封止体の外側に形成されており、
前記(e)工程は、前記第1接合部分および前記第2接合部分を、前記封止体から分離するように切断することを特徴とする半導体装置の製造方法。
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