JP2008195756A - 半導体封止用樹脂組成物及び半導体装置 - Google Patents
半導体封止用樹脂組成物及び半導体装置 Download PDFInfo
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- H01L2224/45001—Core members of the connector
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- H01L2224/45138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
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Abstract
【解決手段】 (A)エポキシ樹脂(A1)、フェノール系樹脂(A2)、有機質充填材(A3)を含む中性子減速材、(B)100μm以上の粒子が1重量%以下である中性子吸収材を含むことを特徴とする半導体封止用樹脂組成物、より好ましくは、前記有機質充填材(A3)が、シリコーン樹脂、ポリアクリル酸エステル及びポリメタクリル酸エステルから選ばれる1種以上であり、前記(B)100μm以上の粒子が1重量%以下である中性子吸収材がホウ素化合物(B1)、カドミウム化合物(B2)及びサマリウム化合物(B3)のから選ばれる1種以上である半導体封止用樹脂組成物。
【選択図】 なし
Description
高エネルギー中性子はMeVレベルの高いエネルギーを有しており、高エネルギー中性子が半導体素子を構成するシリコン原子核と衝突すると原子核が壊れて、α線といった荷電粒子を生じることがある。これらはU、Thなどの放射性元素由来のα線より高いエネルギーをもち電子−正孔対が10倍程度多く発生する。書き換えられるメモリセルの数も多くなり、放射性元素由来のα線より深刻なソフトエラーが発生する。高エネルギー中性子は物質透過性が高く、完全な遮蔽は困難である。そこでエラー対策は材料、デバイス、機器、ソフトウエアの各レベルで行ない機器としてエラーが発生しなければよいとされている。材料としての半導体封止用樹脂組成物にも高エネルギー中性子遮蔽対策を施したものが求められている。
[1] エポキシ樹脂(A1)、フェノール系樹脂(A2)、有機質充填材(A3)を含む中性子減速材、(B)500barn以上、50000barn以下の中性子吸収断面積である元素を有する中性子吸収材を含むことを特徴とする半導体封止用樹脂組成物、
[2] 前記有機質充填材(A3)が、シリコーン樹脂、ポリアクリル酸エステル及びポリメタクリル酸エステルから選ばれる1種以上である第[1]項記載の半導体封止用樹脂組成物、
[3] 前記(B)成分がホウ素化合物(B1)、カドミウム化合物(B2)及びサマリウム化合物(B3)から選ばれる1種以上である第[1]項又は第[2]項記載の半導体封止用樹脂組成物、
[4] 前記(B)成分における100μm以上の粒子の含有割合が1重量%以下である第[1]項ないし第[3]項のいずれかに記載の半導体封止用樹脂組成物、
[5] 前記(A)成分の配合割合が樹脂組成物全体の20重量%以上であり、かつ、前記(B)成分中の500barn以上、50000barn以下の中性子吸収断面積である元素の含有割合が樹脂組成物全体の2.5重量%以上である第[1]項ないし第[4]項のいずれかに記載の半導体封止用樹脂組成物、
[6] 更に(C)硬化促進剤、(D)前記(B)成分以外の無機質充填材を含む第[1]項ないし第[5]項のいずれかに記載の半導体封止用樹脂組成物、
[7] 第[1]項ないし第[6]項のいずれかに記載の半導体封止用樹脂組成物を用いて半導体素子を封止してなることを特徴とする半導体装置、
である。
以下、本発明について詳細に説明する。
本発明の半導体装置の形態としては、特に限定されないが、例えば、デュアル・インライン・パッケージ(DIP)、プラスチック・リード付きチップ・キャリヤ(PLCC)、クワッド・フラット・パッケージ(QFP)、スモール・アウトライン・パッケージ(SOP)、スモール・アウトライン・Jリード・パッケージ(SOJ)、薄型スモール・アウトライン・パッケージ(TSOP)、薄型クワッド・フラット・パッケージ(TQFP)、テープ・キャリア・パッケージ(TCP)、ボール・グリッド・アレイ(BGA)、チップ・サイズ・パッケージ(CSP)等が挙げられる。
上記トランスファーモールドなどの成形方法で封止された半導体装置は、そのまま、或いは80℃〜200℃程度の温度で、10分〜10時間程度の時間をかけて完全硬化させた後、電子機器等に搭載される。
なお、実施例、及び比較例で用いた中性子減速材(A)であるエポキシ樹脂(A1)、フェノール系樹脂(A2)及び有機質充填材(A3)、並びに中性子吸収材(B)であるホウ素化合物(B1)、カドミウム化合物(B2)及びサマリウム化合物(B3)の内容を以下にまとめて示す。
エポキシ樹脂2:ビフェニル型エポキシ樹脂(ジャパンエポキシレジン(株)製、YX−4000、エポキシ当量190、融点105℃)
フェノール系樹脂1:フェノールノボラック樹脂(住友ベークライト(株)製、PR−HF−3、水酸基当量104、軟化点80℃)
フェノール系樹脂2:フェノールアラルキル樹脂(三井化学(株)製、XLC−4L、水酸基当量168、軟化点62℃)
有機質充填材1:ポリメタクリル酸メチル樹脂微粒子(積水化成品工業(株)製、MB30X−5、平均粒径5μm)
有機質充填材2:シリコーン樹脂微粒子(GE東芝シリコーン(株)製、トスパール2000B、平均粒径6μm)
ホウ酸亜鉛(関東化学株式会社製、ホウ酸亜鉛(1級)を55μmの篩に掛けて粒度調整したもの。主成分:2ZnO・3B2O3、平均粒径8.4μm、100μm以上の粒子の割合:0.20重量%)
酸化カドミウム(シグマ・アルドリッチ・ジャパン株式会社製、酸化カドミウム(>99.5重量%)を55μmの篩に掛けて粒度を調整したもの。主成分:CdO、平均粒径0.8μm、100μm以上の粒子の割合:0.02重量%)
硫化サマリウム(三津和化学薬品株式会社製、硫化サマリウム−200メッシュ品を75μmの篩に掛けて粒度を調整したもの。主成分:Sm2S3、平均粒径25.4μm、100μm以上の粒子の割合:0.75重量%)
エポキシ樹脂1 12.33重量部
フェノール系樹脂1 6.47重量部
有機質充填材1 10.00重量部
酸化ホウ素 10.00重量部
トリフェニルホスフィン(以下、TPPという) 0.30重量部
溶融球状シリカ(平均粒径26.5μm) 60.00重量部
γ−グリシドキシプロピルトリメトキシシラン(以下、エポキシシランという)
0.20重量部
カーボンブラック 0.30重量部
カルナバワックス 0.40重量部
を常温でミキサーを用いて混合し、70〜100℃でロール混練し、冷却後粉砕して半導体封止用樹脂組成物を得た。得られた半導体封止用樹脂組成物を以下の方法で評価した。結果を表1、表2に示した。
スパイラルフロー:低圧トランスファー成形機(コータキ精機株式会社製、KTS−15)を用いて、EMMI−1−66に準じたスパイラルフロー測定用金型に、金型温度175℃、注入圧力6.9MPa、保圧時間120秒の条件で半導体封止用樹脂組成物を注入し、流動長を測定した。スパイラルフローは、流動性のパラメータであり、その数値が大きい方が半導体封止用樹脂組成物の流動性が良好である。単位はcm。
表1の配合に従い、実施例1と同様にして半導体封止用樹脂組成物を得、実施例1と同様にして評価した。結果を表1に示した。尚、耐半田性については、中性子透過率が比較的良好な実施例1〜6と比較例1、2のみで実施し、結果を表2に示した。
2 ダイボンド材硬化体
3 ダイパッド
4 ワイヤ
5 リード
6 封止用樹脂組成物の硬化体
Claims (7)
- (A)エポキシ樹脂(A1)、フェノール系樹脂(A2)、有機質充填材(A3)を含む中性子減速材、(B)500barn以上、50000barn以下の中性子吸収断面積である元素を有する中性子吸収材を含むことを特徴とする半導体封止用樹脂組成物。
- 前記有機質充填材(A3)が、シリコーン樹脂、ポリアクリル酸エステル及びポリメタクリル酸エステルから選ばれる1種以上である請求項1記載の半導体封止用樹脂組成物。
- 前記(B)成分がホウ素化合物(B1)、カドミウム化合物(B2)及びサマリウム化合物(B3)から選ばれる1種以上である請求項1又は請求項2記載の半導体封止用樹脂組成物。
- 前記(B)成分における100μm以上の粒子の含有割合が1重量%以下である請求項1ないし請求項3のいずれかに記載の半導体封止用樹脂組成物。
- 前記(A)成分の配合割合が樹脂組成物全体の20重量%以上であり、かつ、前記(B)成分中の500barn以上、50000barn以下の中性子吸収断面積である元素の含有割合が樹脂組成物全体の2.5重量%以上である請求項1ないし請求項4のいずれかに記載の半導体封止用樹脂組成物。
- 更に(C)硬化促進剤、(D)前記(B)成分以外の無機質充填材を含む請求項1ないし請求項5のいずれかに記載の半導体封止用樹脂組成物。
- 請求項1ないし請求項6のいずれかに記載の半導体封止用樹脂組成物を用いて半導体素子を封止してなることを特徴とする半導体装置。
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