JP2017092153A - リードフレーム及びその製造方法、半導体装置 - Google Patents
リードフレーム及びその製造方法、半導体装置 Download PDFInfo
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- JP2017092153A JP2017092153A JP2015217896A JP2015217896A JP2017092153A JP 2017092153 A JP2017092153 A JP 2017092153A JP 2015217896 A JP2015217896 A JP 2015217896A JP 2015217896 A JP2015217896 A JP 2015217896A JP 2017092153 A JP2017092153 A JP 2017092153A
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- lead frame
- semiconductor device
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- resin
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Abstract
【解決手段】本半導体装置は、リードフレームと、前記リードフレームの一方の面に搭載された半導体チップと、前記リードフレーム及び前記半導体チップを被覆する封止樹脂と、を有し、前記リードフレームには、前記リードフレームの他方の面側が薄型化された段差部が設けられ、前記段差部の段差面は前記封止樹脂に被覆され、前記段差面には凹凸部が形成されている。
【選択図】図1
Description
[第1の実施の形態に係る半導体装置の構造]
まず、第1の実施の形態に係る半導体装置の構造について説明する。図1は、第1の実施の形態に係る半導体装置を例示する図であり、図1(a)は底面図、図1(b)は図1(a)のA−A線に沿う断面図、図1(c)は図1(b)のBの部分拡大断面図、図1(d)は図1(b)のBの部分拡大底面図である。但し、図1(a)では、便宜上、樹脂部40を除いて図1(b)の断面図に対応するハッチングを施している。又、図1(d)では、便宜上、樹脂部40の図示は省略されている。
次に、第1の実施の形態に係る半導体装置の製造方法について説明する。図4〜図9は、第1の実施の形態に係る半導体装置の製造工程を例示する図である。
第2の実施の形態では、ダイパッドの上面等に高密度凹凸部を形成する例を示す。なお、第2の実施の形態において、既に説明した実施の形態と同一構成部についての説明は省略する場合がある。
まず、第2の実施の形態に係る半導体装置の構造について説明する。図10は、第2の実施の形態に係る半導体装置を例示する図であり、図10(a)は平面図、図10(b)は図10(a)のA−A線に沿う断面図、図10(c)は図10(b)のBの部分拡大断面図、図10(d)は図10(b)のBの部分拡大平面図である。但し、図10(a)では、便宜上、接着材17、金属線30、樹脂部40の図示は省略され、図10(b)の断面図に対応するハッチングを施している。又、図10(d)では、便宜上、樹脂部40の図示は省略されている。
次に、第2の実施の形態に係る半導体装置の製造方法について説明する。図11〜図14は、第2の実施の形態に係る半導体装置の製造工程を例示する図である。
まず、図19に示す試験用サンプルを作製した。具体的には、銅からなる平坦な金属板であるリードフレーム材100の上面に、凹部の平面形状が直径0.02mm以上0.060mm以下の円である凹凸部を形成した。そして、凹凸部の表面にめっきを施さないで、凹凸部上に表1に示す作製条件で樹脂カップ140を形成した。なお、6種類のSレシオにおいて、各々6個の試験用サンプルを作製し、6回測定を行った。但し、Sレシオ=1は、凹凸部を形成しない試験用サンプル(比較例:従来品)である。又、Sレシオを求める際の表面積の測定は、3次元測定レーザ顕微鏡(オリンパス社製 LEXT OLS4100)を用いて行った。
銅からなるリードフレーム材100の上面に実施例1と同様の凹凸部を形成し、凹凸部の表面に銀めっきを施し、銀めっきを施した凹凸部上に樹脂カップ140を形成した以外は実施例1と同様にしてカップシェア試験を実施した。なお、銀めっき膜の厚さは約6μmとした。
銅からなるリードフレーム材100の上面に実施例1と同様の凹凸部を形成し、凹凸部の表面にNi/Pd/Auめっきを施し、Ni/Pd/Auめっきを施した凹凸部上に樹脂カップ140を形成した以外は実施例1と同様にしてカップシェア試験を実施した。
銅からなるリードフレームの上面に、凹部の平面形状が直径0.02mm以上0.060mm以下の円であって、Sレシオが1.7以上の凹凸部、すなわち高密度凹凸部を形成することにより、樹脂部と接する部分の表面積が増加する。そのため、アンカー効果が生じ、リードフレームと樹脂部との密着性を向上することができる。
10、10S、10T リードフレーム
11 ダイパッド
11d、12d 段差面
11x、12x 段差部
12 リード
13 高密度凹凸部
15 連結部
17 接着材
18 めっき膜
20 半導体チップ
30 金属線
40 樹脂部
151 外枠部
152 ダムバー
153 サポートバー
Claims (18)
- リードフレームと、
前記リードフレームの一方の面に搭載された半導体チップと、
前記リードフレーム及び前記半導体チップを被覆する封止樹脂と、を有し、
前記リードフレームには、前記リードフレームの他方の面側が薄型化された段差部が設けられ、
前記段差部の段差面は前記封止樹脂に被覆され、
前記段差面には凹凸部が形成されている半導体装置。 - 前記凹凸部における凹部の平面形状は直径0.02mm以上0.060mm以下の円、又は、直径0.02mm以上0.060mm以下の外接円に接する多角形であり、
表面積がS0の平坦面に凹凸部を形成し、凹凸部の表面積がSであった場合のS0とSとの比率S/S0が1.7以上である請求項1に記載の半導体装置。 - 前記リードフレームは、外部接続端子となる端子部を有し、
前記端子部の下面側に前記段差部が設けられている請求項1又は2に記載の半導体装置。 - 前記端子部は、前記封止樹脂の側面から露出する第1露出面と、前記封止樹脂の底面から露出する第2露出面と、を備え、
前記段差面は、平面視において、第2露出面の周囲に設けられている請求項3に記載の半導体装置。 - 前記リードフレームは、前記半導体チップを搭載するチップ搭載部を有し、
前記チップ搭載部の下面側に前記段差部が設けられている請求項1乃至4の何れか一項に記載の半導体装置。 - 前記チップ搭載部は、前記封止樹脂の底面から露出する第3露出面を備え、
前記段差面は、平面視において、前記第3露出面の周囲に設けられている請求項5に記載の半導体装置。 - 一方の面に半導体チップが搭載され、封止樹脂により被覆されて半導体装置となるリードフレームであって、
前記半導体装置となる個片化領域を有し、
前記個片化領域には、前記個片化領域の他方の面側が薄型化された段差部が設けられ、
前記段差部の段差面は前記封止樹脂による被覆領域であり、
前記段差部の段差面には凹凸部が形成されているリードフレーム。 - 前記凹凸部における凹部の平面形状は直径0.02mm以上0.060mm以下の円、又は、直径0.02mm以上0.060mm以下の外接円に接する多角形であり、
表面積がS0の平坦面に凹凸部を形成し、凹凸部の表面積がSであった場合のS0とSとの比率S/S0が1.7以上である請求項7に記載のリードフレーム。 - 前記個片化領域に、外部接続端子となる端子部を有し、
前記端子部の下面側に前記段差部が設けられている請求項7又は8に記載のリードフレーム。 - 前記端子部の下面側の外周に前記段差部が設けられている請求項9に記載のリードフレーム。
- 前記個片化領域に、前記半導体チップを搭載するチップ搭載部を有し、
前記チップ搭載部の下面側に前記段差部が設けられている請求項7乃至10の何れか一項に記載のリードフレーム。 - 前記チップ搭載部の下面側の外周に前記段差部が設けられている請求項11に記載のリードフレーム。
- 前記個片化領域を囲む外枠部を有し、
前記個片化領域の厚さは、前記外枠部の厚さよりも薄い請求項7乃至12の何れか一項に記載のリードフレーム。 - 一方の面に半導体チップが搭載され、封止樹脂により被覆されて半導体装置となるリードフレームの製造方法であって、
金属製の板材をエッチングして、前記半導体装置となる個片化領域を形成する工程と、
前記個片化領域の他方の面側が薄型化された段差部を形成すると共に、前記段差部の段差面に凹凸部を形成する工程と、を有し、
前記段差部の段差面は前記封止樹脂による被覆領域であるリードフレームの製造方法。 - 前記凹凸部における凹部の平面形状は直径0.02mm以上0.060mm以下の円、又は、直径0.02mm以上0.060mm以下の外接円に接する多角形であり、
表面積がS0の平坦面に凹凸部を形成し、凹凸部の表面積がSであった場合のS0とSとの比率S/S0が1.7以上である請求項14に記載のリードフレームの製造方法。 - 前記個片化領域を形成する工程と、前記凹凸部を形成する工程と、は同一工程であり、
前記個片化領域、及び前記凹凸部は、同一のエッチングマスクを用いてエッチングにより形成される請求項14又は15に記載のリードフレームの製造方法。 - 前記個片化領域を囲む外枠部を形成する工程と、
前記個片化領域を一方の面側から薄型化し、前記個片化領域の厚さを前記外枠部の厚さよりも薄型化する工程と、を有する請求項14乃至16の何れか一項に記載のリードフレームの製造方法。 - 前記個片化領域を形成する工程と、前記外枠部を形成する工程と、前記個片化領域を薄型化する工程と、は同一工程であり、
前記個片化領域の形成及び薄型化、並びに前記外枠部の形成は、同一のエッチングマスクを用いてエッチングにより行われる請求項17に記載のリードフレームの製造方法。
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