JP6941737B2 - Flake-shaped sealing resin composition and semiconductor device - Google Patents
Flake-shaped sealing resin composition and semiconductor device Download PDFInfo
- Publication number
- JP6941737B2 JP6941737B2 JP2020533411A JP2020533411A JP6941737B2 JP 6941737 B2 JP6941737 B2 JP 6941737B2 JP 2020533411 A JP2020533411 A JP 2020533411A JP 2020533411 A JP2020533411 A JP 2020533411A JP 6941737 B2 JP6941737 B2 JP 6941737B2
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- resin composition
- sealing resin
- flake
- shaped sealing
- mass
- Prior art date
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Classifications
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/62—Alcohols or phenols
- C08G59/621—Phenols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/62—Alcohols or phenols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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Description
本開示は、フレーク状の半導体封止用樹脂組成物、および半導体装置に関する。 The present disclosure relates to a flake-shaped resin composition for encapsulating a semiconductor and a semiconductor device.
トランジスタ、ＩＣ（Integrated Circuit）、ＬＳＩ（Large Scale Integration）等の半導体装置における封止材料は、エポキシ樹脂に硬化剤および／又は硬化促進剤、シリカ粉末等の無機充填材、着色剤等を配合した樹脂組成物が用いられている。
従来、このような封止材料を用いた封止プロセスは、トランスファ成形が一般的であった。しかし、近年、電子部品のプリント配線板への高密度実装化に伴い、半導体装置の主流はピン挿入型のパッケージから表面実装型のパッケージに移っている。さらに、表面実装型パッケージは薄型化・小型化が進んでいる。薄型化・小型化された表面実装型パッケージでは、半導体素子のパッケージに対する占有体積も大きくなり、半導体素子を覆う封止樹脂の肉厚は薄くなる。また、半導体素子の多機能化、大容量化に伴い、チップ面積の増大、多ピン化が進んでいる。さらには電極パッド数の増加によって、パッドピッチ、パッドサイズの縮小化、いわゆる狭パッドピッチ化も進んでいる。For sealing materials in semiconductor devices such as transistors, ICs (Integrated Circuits), and LSIs (Large Scale Integration), a curing agent and / or a curing accelerator, an inorganic filler such as silica powder, a coloring agent, etc. are mixed with an epoxy resin. A resin composition is used.
Conventionally, transfer molding has been generally used as a sealing process using such a sealing material. However, in recent years, with the high-density mounting of electronic components on printed wiring boards, the mainstream of semiconductor devices has shifted from pin-insertion type packages to surface mount type packages. Furthermore, surface mount packages are becoming thinner and smaller. In the thin and miniaturized surface mount type package, the occupied volume of the semiconductor element with respect to the package is also large, and the wall thickness of the sealing resin covering the semiconductor element is thin. Further, with the increase in the number of functions and the capacity of semiconductor elements, the chip area and the number of pins are increasing. Furthermore, as the number of electrode pads increases, the pad pitch and pad size are reduced, that is, the so-called narrow pad pitch is being reduced.
一方、半導体素子を搭載する基板は、半導体素子ほどの電極パッドの狭ピッチ化ができない。そのため、半導体素子から引き出すボンディングワイヤを長くしたり、細線化したりすることにより多端子化に対応している。しかしながら、ワイヤが細くなると、後の樹脂封止工程でワイヤが樹脂の注入圧力により流されやすくなる。特に、サイドゲート方式のトランスファ成形ではこの傾向が著しい。 On the other hand, in the substrate on which the semiconductor element is mounted, the pitch of the electrode pads cannot be narrowed as much as that of the semiconductor element. Therefore, the number of terminals can be increased by lengthening or thinning the bonding wire drawn from the semiconductor element. However, when the wire becomes thin, the wire is easily flown by the injection pressure of the resin in the subsequent resin sealing step. This tendency is particularly remarkable in the side gate type transfer molding.
そこで、トランスファ成形に代わる封止プロセスとして、圧縮成形法が用いられるようになってきている（例えば、特許文献１参照）。この方法は、被封止物（例えば、半導体素子を実装した基板等）を上型に吸着させる一方、これに対向させるように、下型に粉粒状樹脂（封止材料）を供給し、下型を上昇させながら、被封止物と封止材料を加圧して封止成形するものである。圧縮成形法によれば、溶融した封止材料が被封止物の主面と略平行な方向に流動するため、流動量を少なくすることができ、樹脂の流れによる被封止物（例えば、半導体素子を実装した基板におけるワイヤや配線等）の変形・破損を低減させることが期待できる。 Therefore, a compression molding method has come to be used as a sealing process instead of transfer molding (see, for example, Patent Document 1). In this method, an object to be sealed (for example, a substrate on which a semiconductor element is mounted) is adsorbed on the upper mold, while a powdery granular resin (encapsulating material) is supplied to the lower mold so as to face the upper mold, and the lower mold is used. While raising the mold, the object to be sealed and the sealing material are pressed and molded. According to the compression molding method, since the molten sealing material flows in a direction substantially parallel to the main surface of the object to be sealed, the amount of flow can be reduced, and the object to be sealed due to the flow of the resin (for example, It can be expected to reduce deformation / damage of wires, wiring, etc. on a substrate on which a semiconductor element is mounted.
しかしながら、従来のトランスファ成形に用いる封止材料を圧縮成形法に適用しても、その充填性の低さ等から、上記のような所期の効果を十分に得ることはできなかった。圧縮成形法に適した封止材料としては、例えば、特許文献２にはエポキシ樹脂、硬化剤、硬化促進剤、無機充填材等を含有し、粒径１００μｍ〜３ｍｍの粒子が８５質量％以上である粒度分布を有する粉粒状の樹脂組成物が開示されている。特許文献３には、圧縮度を６〜１１％の範囲内に設定することにより、ホッパ等への付着や架橋現象を防止し、流動性の安定化、計量精度の向上を図った粉粒状半導体封止材料が開示されている。特許文献４には固めかさ密度を０．８ｇ／ｃｍ３以上、１．１ｇ／ｃｍ３以下とすることにより、搬送性や秤量精度等を向上させた顆粒状の樹脂組成物が開示されている。However, even if the sealing material used for the conventional transfer molding is applied to the compression molding method, the desired effect as described above cannot be sufficiently obtained due to its low filling property and the like. As a sealing material suitable for the compression molding method, for example,
しかしながら、上記特許文献２〜４に記載の封止材料は、いずれも封止樹脂厚が薄く、また、細くかつ長いボンディングワイヤによって接続された半導体素子を封止する材料として十分なものではない。特に、ワイヤの変形・破損（ワイヤ流れ）の低減や成形性の改善等の点で十分ではなかった。
さらに、半導体装置の大容量化、および高機能化に伴い、半導体素子を複数積層する場合も増加している。半導体素子を複数積層すると、半導体素子上の封止材の肉厚が薄くなるため、半導体素子上に未充填部分が生じる。また、半導体素子を完全に樹脂成形物で封止しないと、信頼性試験で十分な特性を確保することができない。However, none of the sealing materials described in
Further, as the capacity and functionality of semiconductor devices increase, the number of cases where a plurality of semiconductor elements are laminated is increasing. When a plurality of semiconductor elements are laminated, the wall thickness of the sealing material on the semiconductor element becomes thin, so that an unfilled portion is formed on the semiconductor element. Further, unless the semiconductor element is completely sealed with a resin molded product, sufficient characteristics cannot be ensured in the reliability test.
本開示は、圧縮成形法に使用でき、成形時のワイヤ流れを十分に低減し、かつ成形性を十分に向上させることができるフレーク状封止用樹脂組成物、及び当該封止用樹脂組成物を用いて封止された高い信頼性を有する半導体装置を提供する。 The present disclosure is a flake-shaped sealing resin composition that can be used in a compression molding method, can sufficiently reduce wire flow during molding, and can sufficiently improve moldability, and the sealing resin composition. Provided is a semiconductor device having high reliability sealed by using.
本発明者らは、封止用樹脂組成物が後述するような特定の形状を有すると、圧縮成形法におけるワイヤ流れの低減や良好な成形性が得られることを見出した。 The present inventors have found that when the sealing resin composition has a specific shape as described later, reduction of wire flow and good moldability in the compression molding method can be obtained.
すなわち、本開示は、以下の[１]〜[５]を提供する。
［１］（Ａ）エポキシ樹脂、（Ｂ）フェノール樹脂硬化剤、（Ｃ）硬化促進剤、および（Ｄ）無機充填材を含有するフレーク状封止用樹脂組成物であって、
前記フレーク状封止用樹脂組成物の８０質量％以上が、平行な一対の平面を有し、当該一対の平面間の距離が１５０〜１０００μｍである平行面含有樹脂組成物であり、
前記フレーク状封止用樹脂組成物中に含まれる、ＪＩＳ標準篩を用いた分級により、公称目開き１５０μｍの篩を通過するフレーク状封止用樹脂組成物が５質量％以下、及び公称目開き２ｍｍの篩を通過しないフレーク状封止用樹脂組成物が５質量％以下であるフレーク状封止用樹脂組成物。
［２］前記フレーク状封止用樹脂組成物中に含まれる、ＪＩＳ標準篩を用いた分級により、公称目開き１５０μｍを超え１ｍｍ以下の篩を通過するフレーク状封止用樹脂組成物が２０質量％以上である上記［１］に記載のフレーク状封止用樹脂組成物。
［３］下記式（１）で表される隙間率が６０％以下である上記［１］又は［２］に記載のフレーク状封止用樹脂組成物。
隙間率（％）＝｛１−（樹脂供給面積／キャビティ面積）}×１００・・・式（１）
（ここで、隙間率はキャビティ内へ封止用樹脂組成物を供給した時の、当該封止用樹脂組成物により被覆されていない面積比率を表し、キャビティ面積は成形金型の底部の有効面積であり、樹脂供給面積は封止用樹脂組成物によって被覆されている面積を示す。）
［４］上記［１］乃至［３］のいずれかに記載のフレーク状封止用樹脂組成物を用いて圧縮成形により半導体素子を封止してなる半導体装置。
［５］前記半導体装置の半導体素子上の封止材の厚みが２００μｍ以下である上記［４］に記載の半導体装置。That is, the present disclosure provides the following [1] to [5].
[1] A flake-shaped sealing resin composition containing (A) an epoxy resin, (B) a phenol resin curing agent, (C) a curing accelerator, and (D) an inorganic filler.
More than 80% by mass of the flake-shaped sealing resin composition is a parallel plane-containing resin composition having a pair of parallel planes and a distance between the pair of planes of 150 to 1000 μm.
By classification using a JIS standard sieve contained in the flake-shaped sealing resin composition, the amount of the flake-shaped sealing resin composition passing through a sieve having a nominal opening of 150 μm is 5% by mass or less, and the nominal opening is nominally opened. A flake-shaped sealing resin composition in which the amount of the flake-shaped sealing resin composition that does not pass through a 2 mm sieve is 5% by mass or less.
[2] By classification using a JIS standard sieve contained in the flake-shaped sealing resin composition, 20 mass of flake-shaped sealing resin composition passes through a sieve having a nominal opening of more than 150 μm and 1 mm or less. % Or more, the flake-shaped sealing resin composition according to the above [1].
[3] The flake-shaped sealing resin composition according to the above [1] or [2], wherein the gap ratio represented by the following formula (1) is 60% or less.
Gap ratio (%) = {1- (resin supply area / cavity area)} x 100 ... Equation (1)
(Here, the gap ratio represents the area ratio not covered with the sealing resin composition when the sealing resin composition is supplied into the cavity, and the cavity area is the effective area of the bottom of the molding mold. The resin supply area indicates the area covered with the sealing resin composition.)
[4] A semiconductor device for sealing a semiconductor element by compression molding using the flake-shaped sealing resin composition according to any one of the above [1] to [3].
[5] The semiconductor device according to the above [4], wherein the thickness of the sealing material on the semiconductor element of the semiconductor device is 200 μm or less.
本開示によれば、圧縮成形法に用いられ、成形時のワイヤ流れを十分に低減し、かつ成形性を十分に向上させることができるフレーク状封止用樹脂組成物、及び当該封止用樹脂組成物を用いて封止された高い信頼性を有する半導体装置を提供することができる。 According to the present disclosure, a flake-shaped sealing resin composition used in a compression molding method, which can sufficiently reduce wire flow during molding and sufficiently improve moldability, and the sealing resin. It is possible to provide a semiconductor device having high reliability sealed by using the composition.
以下、本開示について、一実施形態であるフレーク状封止用樹脂組成物、半導体装置及び半導体装置の製造方法を参照しながら詳細に説明する。
［フレーク状封止用樹脂組成物］
本実施形態のフレーク状封止用樹脂組成物（以下、単に封止用樹脂組成物ともいう）は、（Ａ）エポキシ樹脂、（Ｂ）フェノール樹脂硬化剤、（Ｃ）硬化促進剤、および（Ｄ）無機充填材を含有するフレーク状封止用樹脂組成物であって、
前記フレーク状封止用樹脂組成物の８０質量％以上が、平行な一対の平面を有し、当該一対の平面間の距離が１５０〜１０００μｍである平行面含有樹脂組成物であり、
前記フレーク状封止用樹脂組成物中に含まれる、ＪＩＳ標準篩を用いた分級により、公称目開き１５０μｍの篩を通過するフレーク状封止用樹脂組成物が５質量％以下、及び公称目開き２ｍｍの篩を通過しないフレーク状封止用樹脂組成物が５質量％以下である。Hereinafter, the present disclosure will be described in detail with reference to an embodiment of a flake-shaped sealing resin composition, a semiconductor device, and a method for manufacturing the semiconductor device.
[Flake-shaped sealing resin composition]
The flake-shaped sealing resin composition of the present embodiment (hereinafter, also simply referred to as a sealing resin composition) includes (A) epoxy resin, (B) phenol resin curing agent, (C) curing accelerator, and ( D) A flake-shaped sealing resin composition containing an inorganic filler.
More than 80% by mass of the flake-shaped sealing resin composition is a parallel plane-containing resin composition having a pair of parallel planes and a distance between the pair of planes of 150 to 1000 μm.
By classification using a JIS standard sieve contained in the flake-shaped sealing resin composition, the amount of the flake-shaped sealing resin composition passing through a sieve having a nominal opening of 150 μm is 5% by mass or less, and the nominal opening is nominally opened. The amount of the flake-shaped sealing resin composition that does not pass through the 2 mm sieve is 5% by mass or less.
ここで、「フレーク状」とは扁平状、薄片状、鱗片状等の形状を含む。本実施形態のフレーク状封止用樹脂組成物は、当該封止用樹脂組成物の８０質量％以上が、平行な一対の平面を有し、当該一対の平面間の距離（以下、厚みともいう）が１５０〜１０００μｍである平行面含有樹脂組成物である。
ここで、「平行」とは個々の封止用樹脂組成物の平均厚みに対する当該封止用樹脂組成物の最大厚みと最小厚みとの差の割合が５％以下であることを意味する。
上記封止用樹脂組成物の厚みが１５０μｍ未満では静電気の影響を受け凝集しやすくなる。凝集した封止用樹脂組成物は、熱が均一に伝わりにくく溶け性が低下するおそれがある。また、当該封止用樹脂組成物の厚みが１０００μｍを超えると熱が均一に伝わりにくく溶け性が低下するおそれがある。このような観点から、封止用樹脂組成物の厚みは、１５０〜７００μｍであってもよく、１５０〜５００μｍであってもよく、２００〜４００μｍであってもよい。
なお、上記フレーク状封止用樹脂組成物の厚みは、例えば、光学顕微鏡（倍率：２００倍）を用いて５０個の封止用樹脂組成物の厚みを測定し、その平均値として求めることができる。Here, the "flake-like" includes shapes such as flat, flaky, and scaly. In the flake-shaped sealing resin composition of the present embodiment, 80% by mass or more of the sealing resin composition has a pair of parallel planes, and the distance between the pair of planes (hereinafter, also referred to as thickness). ) Is a parallel plane-containing resin composition having a size of 150 to 1000 μm.
Here, "parallel" means that the ratio of the difference between the maximum thickness and the minimum thickness of the sealing resin composition to the average thickness of each sealing resin composition is 5% or less.
If the thickness of the sealing resin composition is less than 150 μm, it is easily aggregated due to the influence of static electricity. The agglomerated sealing resin composition does not easily transfer heat uniformly, and the solubility may decrease. Further, if the thickness of the sealing resin composition exceeds 1000 μm, heat may not be transferred uniformly and the solubility may decrease. From such a viewpoint, the thickness of the sealing resin composition may be 150 to 700 μm, 150 to 500 μm, or 200 to 400 μm.
The thickness of the flake-shaped sealing resin composition can be determined as an average value by measuring the thickness of 50 sealing resin compositions using, for example, an optical microscope (magnification: 200 times). can.
また、本実施形態のフレーク状封止用樹脂組成物中に含まれる上述の形状を有する封止用樹脂組成物（平行面含有樹脂組成物）の割合は、９０質量％以上であってもよく、９５質量％以上であってもよく、１００質量％であってもよい。
なお、本実施形態のフレーク状封止用樹脂組成物は、フレーク状ではない樹脂組成物、上述の形状を有さない樹脂組成物を含んでもよい。本実施形態のフレーク状封止用樹脂組成物がフレーク状ではない樹脂組成物、上述の形状を有さない樹脂組成物を含む場合、その含有量は、当該フレーク状封止用樹脂組成物全量に対し２０質量％以下であってもよく、１０質量％以下であってもよく、５質量％以下であってもよく、含まなくてもよい。Further, the proportion of the sealing resin composition (parallel surface-containing resin composition) having the above-mentioned shape contained in the flake-shaped sealing resin composition of the present embodiment may be 90% by mass or more. , 95% by mass or more, or 100% by mass.
The flake-shaped sealing resin composition of the present embodiment may include a non-flake-shaped resin composition and a resin composition having no above-mentioned shape. When the flake-shaped sealing resin composition of the present embodiment contains a non-flake-shaped resin composition and a resin composition having no above-mentioned shape, the content thereof is the total amount of the flake-shaped sealing resin composition. It may be 20% by mass or less, 10% by mass or less, 5% by mass or less, or may not be contained.
本実施形態のフレーク状封止用樹脂組成物中に含まれる、ＪＩＳ標準篩（ＪＩＳ Ｚ８８０１−１：２００６規定）を用いた分級により、公称目開き１５０μｍの篩を通過するフレーク状封止用樹脂組成物（以下、封止用樹脂組成物ａともいう）が５質量％以下、及び公称目開き２ｍｍの篩を通過しないフレーク状封止用樹脂組成物（以下、封止用樹脂組成物ｂともいう）が５質量％以下である。封止用樹脂組成物ａの含有量が５質量％を超えると、圧縮成形用金型に供給する際に、当該封止用樹脂組成物ａが舞い上がりやすく、飛散した当該封止用樹脂組成物ａによる汚染や、計量不良等が生ずるおそれがある。このような観点から、フレーク状封止用樹脂組成物中に含まれる封止用樹脂組成物ａは、３質量％以下であってもよく、２質量％以下であってもよい。また、封止用樹脂組成物ｂの含有量が５質量％を超えると、成形時にワイヤの変形および破損が生じるおそれがあり、また、硬化物にボイドが発生するおそれがある。このような観点から、フレーク状封止用樹脂組成物中に含まれる封止用樹脂組成物ｂは、３質量％以下であってもよく、２質量％以下であってもよい。 A flake-shaped sealing resin that passes through a sieve with a nominal opening of 150 μm by classification using a JIS standard sieve (JIS Z8801-1: 2006 specification) contained in the flake-shaped sealing resin composition of the present embodiment. A flake-shaped sealing resin composition (hereinafter, also referred to as a sealing resin composition b) in which the composition (hereinafter, also referred to as a sealing resin composition a) does not pass through a sieve having a nominal opening of 2 mm and 5% by mass or less. Is 5% by mass or less. When the content of the sealing resin composition a exceeds 5% by mass, the sealing resin composition a tends to fly up when supplied to the compression molding die, and the sealing resin composition is scattered. There is a risk of contamination by a and improper measurement. From such a viewpoint, the sealing resin composition a contained in the flake-shaped sealing resin composition may be 3% by mass or less, or 2% by mass or less. Further, if the content of the sealing resin composition b exceeds 5% by mass, the wire may be deformed or broken during molding, and voids may be generated in the cured product. From such a viewpoint, the sealing resin composition b contained in the flake-shaped sealing resin composition may be 3% by mass or less, or 2% by mass or less.
また、本実施形態のフレーク状封止用樹脂組成物は、ＪＩＳ標準篩（ＪＩＳ Ｚ８８０１−１：２００６規定）を用いた分級により、公称目開き１５０μｍを超え２ｍｍ以下の篩を通過するフレーク状封止用樹脂組成物を含んでもよく、ＪＩＳ標準篩（ＪＩＳ Ｚ８８０１−１：２００６規定）を用いた分級により、公称目開き１５０μｍを超え１ｍｍ以下の篩を通過するフレーク状封止用樹脂組成物(以下、封止用樹脂組成物ｃともいう）を含んでもよい。ここで、公称目開き１５０μｍを超え１ｍｍ以下の篩を通過するフレーク状封止用樹脂組成物とは、公称目開き１５０μｍの篩を通過せず、公称目開き１ｍｍの篩を通過するフレーク状封止用樹脂組成物のことである。封止用樹脂組成物ｃの含有量としては、２０質量％以上であってもよく、４０質量％以上であってもよく、６０質量％以上であってもよい。封止用樹脂組成物ｃを２０質量％以上含有すると充填性が良好となり、硬化物にボイド等の発生を低減することができる。また、上限値は特に限定されず、１００質量％であってもよく、９０質量％であってもよい。 Further, the flake-shaped sealing resin composition of the present embodiment is classified into a flake-shaped seal using a JIS standard sieve (JIS Z8801-1: 2006 specification) and passes through a sieve having a nominal opening of more than 150 μm and 2 mm or less. A resin composition for flake sealing may contain a resin composition for stopping, and is passed through a sieve having a nominal opening of more than 150 μm and 1 mm or less by classification using a JIS standard sieve (JIS Z8801-1: 2006 standard). Hereinafter, it may also contain a sealing resin composition c). Here, the flake-shaped sealing resin composition that passes through a sieve having a nominal opening of more than 150 μm and 1 mm or less is a flake-shaped seal that does not pass through a sieve having a nominal opening of 150 μm but passes through a sieve having a nominal opening of 1 mm. It is a resin composition for stopping. The content of the sealing resin composition c may be 20% by mass or more, 40% by mass or more, or 60% by mass or more. When the sealing resin composition c is contained in an amount of 20% by mass or more, the filling property is improved and the generation of voids and the like in the cured product can be reduced. The upper limit is not particularly limited, and may be 100% by mass or 90% by mass.
本実施形態のフレーク状封止用樹脂組成物中に含まれる、ＪＩＳ標準篩（ＪＩＳ Ｚ８８０１−１：２００６規定）を用いた分級により、公称目開き１ｍｍを超え２ｍｍ以下の篩を通過するフレーク状封止用樹脂組成物(以下、封止用樹脂組成物ｄともいう）の含有量は、充填性を高め、ボイドの発生を低減する観点から、１０〜７５質量％であってもよく、１５〜５０質量％であってもよく、１８〜４０質量％であってもよい。 Flakes that pass through a sieve with a nominal opening of more than 1 mm and 2 mm or less by classification using a JIS standard sieve (JIS Z8801-1: 2006 standard) contained in the flake-shaped sealing resin composition of the present embodiment. The content of the sealing resin composition (hereinafter, also referred to as the sealing resin composition d) may be 10 to 75% by mass from the viewpoint of improving the filling property and reducing the generation of voids. It may be ~ 50% by mass, or 18-40% by mass.
〔（Ａ）エポキシ樹脂〕
本実施形態で用いられる（Ａ）成分のエポキシ樹脂は、１分子中に２個以上のエポキシ基を有するものであれば、分子構造、分子量等に制限されることなく一般に電子部品の封止材料として使用されているものを広く用いることができる。
（Ａ）成分のエポキシ樹脂としては、例えば、ビフェニル型エポキシ樹脂、クレゾールノボラック型エポキシ樹脂、フェノールノボラック型エポキシ樹脂、ビスフェノールＡ型エポキシ樹脂、ビスフェノールＦ型エポキシ樹脂、ビスフェノールＳ型エポキシ樹脂、ジシクロペンタジエン型エポキシ樹脂、トリフェノールメタン型エポキシ樹脂、トリアジン核含有エポキシ樹脂等の複素環型エポキシ樹脂、スチルベン型二官能エポキシ樹脂、ナフタレン型エポキシ樹脂、縮合環芳香族炭化水素変性エポキシ樹脂、脂環型エポキシ樹脂などが挙げられる。なかでも、ビフェニル型エポキシ樹脂であってもよい。
これらのエポキシ樹脂は１種を使用してもよく、２種以上を混合して使用してもよい。[(A) Epoxy resin]
As long as the epoxy resin of the component (A) used in the present embodiment has two or more epoxy groups in one molecule, it is generally a sealing material for electronic components without being limited by the molecular structure, molecular weight, etc. Can be widely used.
Examples of the epoxy resin of the component (A) include biphenyl type epoxy resin, cresol novolac type epoxy resin, phenol novolac type epoxy resin, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, and dicyclopentadiene. Heterocyclic epoxy resin such as type epoxy resin, triphenol methane type epoxy resin, triazine nucleus-containing epoxy resin, stillben type bifunctional epoxy resin, naphthalene type epoxy resin, condensed ring aromatic hydrocarbon modified epoxy resin, alicyclic epoxy Examples include resin. Among them, a biphenyl type epoxy resin may be used.
One type of these epoxy resins may be used, or two or more types may be mixed and used.
（Ａ）成分のエポキシ樹脂の軟化点は、封止用樹脂組成物のハンドリング性、および成形時の溶融粘度の観点から、４０〜１３０℃であってもよく、５０〜１１０℃であってもよい。
なお、本明細書における軟化点とは、「環球式軟化点」を指し、ＡＳＴＭ Ｄ３６に準拠して測定された値をいう。The softening point of the epoxy resin of the component (A) may be 40 to 130 ° C. or 50 to 110 ° C. from the viewpoint of the handleability of the sealing resin composition and the melt viscosity at the time of molding. good.
The softening point in the present specification refers to a "ring-ball type softening point" and means a value measured in accordance with ASTM D36.
（Ａ）成分のエポキシ樹脂の市販品を例示すると、例えば、三菱ケミカル（株）製のＹＸ−４０００（エポキシ当量１８５、軟化点１０５℃）、同ＹＸ−４０００Ｈ（エポキシ当量１９３、軟化点１０５℃）、日本化薬（株）製のＮＣ−３０００（エポキシ当量２７３、軟化点５８℃）、同ＮＣ−３０００Ｈ（エポキシ当量２８８、軟化点９１℃）（以上、いずれも商品名）等が挙げられる。 Examples of commercially available products of the epoxy resin of the component (A) include YX-4000 (epoxy equivalent 185, softening point 105 ° C.) and YX-4000H (epoxy equivalent 193, softening point 105 ° C.) manufactured by Mitsubishi Chemical Corporation. ), NC-3000 manufactured by Nippon Kayaku Co., Ltd. (epoxy equivalent 273, softening point 58 ° C), NC-3000H (epoxy equivalent 288, softening point 91 ° C) (all of which are trade names) and the like. ..
〔（Ｂ）フェノール樹脂硬化剤〕
本実施形態で用いられる（Ｂ）成分のフェノール樹脂硬化剤は、１分子当たり２個以上のフェノール性水酸基を有し、上記（Ａ）成分のエポキシ樹脂を硬化させることができるものである。電子部品の封止材料として一般に用いられるものであれば特に制限されることなく使用できる。
（Ｂ）成分のフェノール樹脂硬化剤としては、具体的には、フェノール、アルキルフェノール等のフェノール類とホルムアルデヒド又はパラホルムアルデヒドを反応させて得られるフェノールノボラック樹脂やクレゾールノボラック樹脂等のノボラック型フェノール樹脂、これらのノボラック型フェノール樹脂をエポキシ化又はブチル化した変性ノボラック型フェノール樹脂、ジシクロペンタジエン変性フェノール樹脂、パラキシレン変性フェノール樹脂、フェノールアラルキル樹脂、ビフェニルアラルキル樹脂、ナフトールアラルキル樹脂、トリフェノールアルカン型フェノール樹脂、多官能型フェノール樹脂などが挙げられる。なかでも、フェノールアラルキル樹脂、フェノールノボラック樹脂、ビフェニルアラルキル樹脂が好ましい。これらのフェノール樹脂硬化剤は１種を使用してもよく、２種以上を混合して使用してもよい。[(B) Phenol resin curing agent]
The phenolic resin curing agent of the component (B) used in the present embodiment has two or more phenolic hydroxyl groups per molecule and can cure the epoxy resin of the component (A). Any material that is generally used as a sealing material for electronic components can be used without particular limitation.
Specific examples of the phenol resin curing agent as the component (B) include novolac-type phenol resins such as phenol novolac resin and cresol novolac resin obtained by reacting phenols such as phenol and alkylphenol with formaldehyde or paraformaldehyde. Modified novolac-type phenol resin, dicyclopentadiene-modified phenol resin, paraxylene-modified phenol resin, phenol aralkyl resin, biphenyl aralkyl resin, naphthol aralkyl resin, triphenol alkane-type phenol resin, Examples include polyfunctional phenolic resins. Of these, phenol aralkyl resin, phenol novolac resin, and biphenyl aralkyl resin are preferable. One type of these phenol resin curing agents may be used, or two or more types may be mixed and used.
（Ｂ）成分のフェノール樹脂硬化剤の含有量は、上記（Ａ）成分のエポキシ樹脂が有するエポキシ基数（ａ）に対する（Ｂ）成分のフェノール樹脂硬化剤が有するフェノール性水酸基数（ｂ）の比（ｂ）／（ａ）が０．３以上１．５以下となる範囲であってもよく、０．５以上１．２以下となる範囲であってもよい。比（ｂ）／（ａ）が０．３以上であると硬化物の耐湿信頼性が向上し、１．５以下であると硬化物の強度が向上する。 The content of the phenol resin curing agent of the component (B) is the ratio of the number of phenolic hydroxyl groups (b) of the phenol resin curing agent of the component (B) to the number of epoxy groups (a) of the epoxy resin of the component (A). (B) / (a) may be in the range of 0.3 or more and 1.5 or less, or may be in the range of 0.5 or more and 1.2 or less. When the ratio (b) / (a) is 0.3 or more, the moisture resistance reliability of the cured product is improved, and when it is 1.5 or less, the strength of the cured product is improved.
また、封止用樹脂組成物中における（Ａ）成分のエポキシ樹脂及び（Ｂ）成分のフェノール樹脂硬化剤の合計含有量は、５〜２０質量％であってもよく、１０〜１５質量％であってもよい。 The total content of the epoxy resin of the component (A) and the phenol resin curing agent of the component (B) in the sealing resin composition may be 5 to 20% by mass, and may be 10 to 15% by mass. There may be.
〔（Ｃ）硬化促進剤〕
本実施形態で用いられる（Ｃ）成分の硬化促進剤は、（Ａ）成分のエポキシ樹脂と、（Ｂ）成分のフェノール樹脂硬化剤との硬化反応を促進する成分である。（Ｃ）成分の硬化促進剤は、上記作用を奏するものであれば、特に制限されることなく公知の硬化促進剤を使用することができる。[(C) Curing accelerator]
The curing accelerator of the component (C) used in the present embodiment is a component that promotes the curing reaction between the epoxy resin of the component (A) and the phenol resin curing agent of the component (B). As the curing accelerator of the component (C), a known curing accelerator can be used without particular limitation as long as it exhibits the above-mentioned action.
（Ｃ）成分の硬化促進剤としては、具体的には、２−メチルイミダゾール、２−エチルイミダゾール、２−イソプロピルイミダゾール、２−ウンデシルイミダゾール、１，２−ジメチルイミダゾール、２，４−ジメチルイミダゾール、２−フェニルイミダゾール、２−フェニル−４−メチルイミダゾール、４−メチルイミダゾール、４−エチルイミダゾール、２−フェニル−４−ヒドロキシメチルイミダゾール、２−エチル−４−メチルイミダゾール、１−シアノエチル−２−メチルイミダゾール、２−フェニル−４−メチル−５−ヒドロキシメチルイミダゾール、２−フェニル−４，５−ジヒドロキシメチルイミダゾール、１−ベンジル−２−メチルイミダゾール、１−ベンジル−２−フェニルイミダゾール、１−シアノエチル−２−エチル−４−メチルイミダゾール、１−シアノエチル−２−ウンデシルイミダゾール、１−シアノエチル−２−フェニルイミダゾール等のイミダゾール類；１，８−ジアザビシクロ［５．４．０］ウンデセン−７（ＤＢＵ）、１，５−ジアザビシクロ［４．３．０］ノネン、５，６−ジブチルアミノ−１，８−ジアザビシクロ［５．４．０］ウンデセン−７等のジアザビシクロ化合物及びこれらの塩；トリエチルアミン、トリエチレンジアミン、ベンジルジメチルアミン、α−メチルベンジルジメチルアミン、トリエタノールアミン、ジメチルアミノエタノール、トリス（ジメチルアミノメチル）フェノール等の三級アミン類；トリメチルホスフィン、トリエチルホスフィン、トリブチルホスフィン、ジフェニルホスフィン、トリフェニルホスフィン、トリ（ｐ−メチルフェニル）ホスフィン、トリ（ノニルフェニル）ホスフィン、メチルジフェニルホスフィン、ジブチルフェニルホスフィン、トリシクロヘキシルホスフィン、ビス（ジフェニルホスフィノ）メタン、１，２−ビス（ジフェニルホスフィノ）エタン等の有機ホスフィン化合物などが挙げられる。これらのなかでも、流動性及び成形性が良好であるという観点から、イミダゾール類であってもよい。これらの硬化促進剤は１種を使用してもよく、２種以上を混合して使用してもよい。 Specific examples of the curing accelerator for the component (C) include 2-methylimidazole, 2-ethyl imidazole, 2-isopropyl imidazole, 2-undecyl imidazole, 1,2-dimethyl imidazole, and 2,4-dimethyl imidazole. , 2-Phenylimidazole, 2-Phenyl-4-methylimidazole, 4-Methylimidazole, 4-Ethylimidazole, 2-Phenyl-4-hydroxymethylimidazole, 2-Ethyl-4-methylimidazole, 1-Cyanoethyl-2- Methyl imidazole, 2-phenyl-4-methyl-5-hydroxymethyl imidazole, 2-phenyl-4,5-dihydroxymethyl imidazole, 1-benzyl-2-methyl imidazole, 1-benzyl-2-phenyl imidazole, 1-cyanoethyl Imidazoles such as -2-ethyl-4-methylimidazole, 1-cyanoethyl-2-undecylimidazole, 1-cyanoethyl-2-phenylimidazole; 1,8-diazabicyclo [5.4.0] undecene-7 (DBU) ), 1,5-diazabicyclo [4.3.0] nonene, 5,6-dibutylamino-1,8-diazabicyclo [5.4.0] undecene-7 and other diazabicyclo compounds and salts thereof; triethylamine, tri Tertiary amines such as ethylenediamine, benzyldimethylamine, α-methylbenzyldimethylamine, triethanolamine, dimethylaminoethanol, tris (dimethylaminomethyl) phenol; trimethylphosphine, triethylphosphine, tributylphosphine, diphenylphosphine, triphenylphosphine , Tri (p-methylphenyl) phosphine, tri (nonylphenyl) phosphine, methyldiphenylphosphine, dibutylphenylphosphine, tricyclohexylphosphine, bis (diphenylphosphino) methane, 1,2-bis (diphenylphosphino) ethane, etc. Examples include organic phosphine compounds. Among these, imidazoles may be used from the viewpoint of good fluidity and moldability. One type of these curing accelerators may be used, or two or more types may be mixed and used.
（Ｃ）成分の硬化促進剤の含有量は、封止用樹脂組成物全量に対し、０．１〜５質量％の範囲であってもよく、０．１〜１質量％の範囲であってもよい。（Ｃ）成分の硬化促進剤の含有量が０．１質量％以上であると硬化性の促進効果が得られ、５質量％以下であると成形時にワイヤの変形および破損を抑制し、充填性を良好にすることができる。 The content of the curing accelerator of the component (C) may be in the range of 0.1 to 5% by mass, or in the range of 0.1 to 1% by mass, based on the total amount of the sealing resin composition. May be good. When the content of the curing accelerator of the component (C) is 0.1% by mass or more, the curability promoting effect is obtained, and when it is 5% by mass or less, deformation and breakage of the wire during molding are suppressed, and the filling property Can be improved.
〔（Ｄ）無機充填材〕
本実施形態で用いられる（Ｄ）成分の無機充填材は、この種の樹脂組成物に一般的に使用されている公知の無機充填材であれば、特に制限されることなく使用することができる。
（Ｄ）成分の無機充填材としては、例えば、溶融シリカ、結晶シリカ、破砕シリカ、合成シリカ、アルミナ、酸化チタン、酸化マグネシウム等の酸化物粉末；水酸化アルミニウム、水酸化マグネシウム等の水酸化物粉末；窒化ホウ素、窒化アルミニウム、窒化ケイ素等の窒化物粉末などが挙げられる。これらの無機充填材は、１種を使用してもよく、２種以上を混合して使用してもよい。[(D) Inorganic filler]
The inorganic filler of the component (D) used in the present embodiment can be used without particular limitation as long as it is a known inorganic filler generally used in this type of resin composition. ..
Examples of the inorganic filler of the component (D) include oxide powders such as molten silica, crystalline silica, crushed silica, synthetic silica, alumina, titanium oxide and magnesium oxide; and hydroxides such as aluminum hydroxide and magnesium oxide. Powder; Nitride powder such as boron nitride, aluminum oxide, silicon nitride and the like can be mentioned. One type of these inorganic fillers may be used, or two or more types may be mixed and used.
（Ｄ）成分の無機充填材は、本実施形態の封止用樹脂組成物の取り扱い性および成形性を高める観点から、上記例示したなかでもシリカ粉末であってもよく、溶融シリカであってもよく、球状溶融シリカであってもよい。また、溶融シリカと溶融シリカ以外のシリカを併用することもでき、その場合、溶融シリカ以外のシリカの割合はシリカ粉末全体の３０質量％未満としてもよい。 The inorganic filler of the component (D) may be silica powder or molten silica among the above-exemplified examples from the viewpoint of improving the handleability and moldability of the sealing resin composition of the present embodiment. It may be spherical molten silica. Further, fused silica and silica other than fused silica can be used in combination, and in that case, the proportion of silica other than fused silica may be less than 30% by mass of the entire silica powder.
（Ｄ）成分の無機充填材は、平均粒径が０．５〜４０μｍであってもよく、１〜３０μｍであってもよく、５〜２０μｍであってもよい。また、（Ｄ）成分の無機充填材の最大粒径は５５μｍ以下であってもよい。平均粒径が０．５μｍ以上であると、封止用樹脂組成物の流動性および成形性を向上させることができる。一方、平均粒径が４０μｍ以下であると、封止用樹脂組成物を硬化して得られる成形品の反りが抑制され、寸法精度を向上させることができる。また、最大粒径が５５μｍ以下であると、封止用樹脂組成物の成形性を向上させることができる。
なお、本明細書において、（Ｄ）成分の無機充填材の平均粒径は、例えば、レーザー回折式粒度分布測定装置により求めることができ、平均粒径は、同装置で測定された粒度分布において積算体積が５０％になる粒径（ｄ５０）である。The inorganic filler of the component (D) may have an average particle size of 0.5 to 40 μm, 1 to 30 μm, or 5 to 20 μm. Further, the maximum particle size of the inorganic filler of the component (D) may be 55 μm or less. When the average particle size is 0.5 μm or more, the fluidity and moldability of the sealing resin composition can be improved. On the other hand, when the average particle size is 40 μm or less, the warp of the molded product obtained by curing the sealing resin composition is suppressed, and the dimensional accuracy can be improved. Further, when the maximum particle size is 55 μm or less, the moldability of the sealing resin composition can be improved.
In the present specification, the average particle size of the inorganic filler of the component (D) can be determined by, for example, a laser diffraction type particle size distribution measuring device, and the average particle size is based on the particle size distribution measured by the device. It is a particle size (d50) at which the integrated volume becomes 50%.
（Ｄ）成分の無機充填材の含有量は、封止用樹脂組成物全量に対し、７０〜９５質量％の範囲であってもよく、７５〜９０質量％の範囲であってもよい。（Ｄ）成分の無機充填材の含有量が７０質量％以上であると、封止用樹脂組成物の線膨張係数が増大しすぎることがなく、当該封止用樹脂組成物を硬化して得られる成形品の寸法精度、耐湿性、機械的強度等を向上させることができる。また、（Ｄ）成分の無機充填材の含有量が９５質量％以下であると、封止用樹脂組成物を成形して得られる樹脂シートを割れにくくすることができる。また、封止用樹脂組成物の溶融粘度が増大しすぎることがなく、流動性および成形性を向上させることができる。 The content of the inorganic filler of the component (D) may be in the range of 70 to 95% by mass or 75 to 90% by mass with respect to the total amount of the sealing resin composition. When the content of the inorganic filler of the component (D) is 70% by mass or more, the linear expansion coefficient of the sealing resin composition does not increase too much, and the sealing resin composition is cured. It is possible to improve the dimensional accuracy, moisture resistance, mechanical strength, etc. of the molded product. Further, when the content of the inorganic filler of the component (D) is 95% by mass or less, the resin sheet obtained by molding the sealing resin composition can be made hard to crack. Further, the melt viscosity of the sealing resin composition does not increase too much, and the fluidity and moldability can be improved.
本実施形態の封止用樹脂組成物には、以上の各成分の他、本実施形態の効果を阻害しない範囲で、この種の樹脂組成物に一般に配合される成分、例えば、カップリング剤；合成ワックス、天然ワックス、高級脂肪酸、高級脂肪酸の金属塩等の離型剤；カーボンブラック、コバルトブルー等の着色剤；シリコーンオイル、シリコーンゴム等の低応力付与剤；ハイドロタルサイト類；イオン捕捉剤などを配合することができる。 In addition to the above components, the sealing resin composition of the present embodiment includes components generally blended in this type of resin composition, for example, a coupling agent, as long as the effects of the present embodiment are not impaired. Release agents such as synthetic waxes, natural waxes, higher fatty acids, metal salts of higher fatty acids; colorants such as carbon black and cobalt blue; low stress imparting agents such as silicone oil and silicone rubber; hydrotalcites; ion scavengers Etc. can be blended.
カップリング剤としては、エポキシシラン系、アミノシラン系、ウレイドシラン系、ビニルシラン系、アルキルシラン系、有機チタネート系、アルミニウムアルコレート系等のカップリング剤を使用することができる。これらのカップリング剤は１種を使用してもよく、２種以上を混合して使用してもよい。なかでも、成形性、難燃性、硬化性等の観点から、アミノシラン系カップリング剤が好ましく、特に、γ−アミノプロピルトリメトキシシラン、γ−アミノプロピルトリエトキシシラン、γ−アミノプロピルメチルジメトキシシラン、γ−アミノプロピルメチルジエトキシシラン、γ−フェニルアミノプロピルトリメトキシシラン等が好ましい。 As the coupling agent, an epoxysilane-based, aminosilane-based, ureidosilane-based, vinylsilane-based, alkylsilane-based, organic titanate-based, aluminum alcoholate-based, or other coupling agent can be used. One of these coupling agents may be used, or two or more of these coupling agents may be mixed and used. Of these, aminosilane-based coupling agents are preferable from the viewpoints of moldability, flame retardancy, curability, etc., and in particular, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, and γ-aminopropylmethyldimethoxysilane. , Γ-Aminopropylmethyldiethoxysilane, γ-phenylaminopropyltrimethoxysilane and the like are preferable.
カップリング剤の含有量は、封止用樹脂組成物全量に対し、０．０１〜３質量％の範囲であってもよく、０．１〜１質量％の範囲であってもよい。カップリング剤の含有量が０．０１質量％以上であると、封止用樹脂組成物の成形性を向上させることができ、３質量％以下であると封止用樹脂組成物の成形時に発泡が低減でき、成形品にボイド又は表面膨れ等の発生を低減することができる。 The content of the coupling agent may be in the range of 0.01 to 3% by mass or 0.1 to 1% by mass with respect to the total amount of the sealing resin composition. When the content of the coupling agent is 0.01% by mass or more, the moldability of the sealing resin composition can be improved, and when it is 3% by mass or less, foaming occurs during molding of the sealing resin composition. Can be reduced, and the occurrence of voids or surface swelling in the molded product can be reduced.
本実施形態の封止用樹脂組成物は、ブロッキングを抑制する観点から、溶剤を含まなくてもよい。また、当該封止用樹脂組成物が溶剤を含まない場合、半導体素子を封止する際に、溶剤残りによる信頼性低下を招くおそれがない。 The sealing resin composition of the present embodiment may not contain a solvent from the viewpoint of suppressing blocking. Further, when the sealing resin composition does not contain a solvent, there is no possibility that the reliability may be lowered due to the residual solvent when sealing the semiconductor element.
本実施形態の封止用樹脂組成物は、公知の封止用樹脂組成物の製造方法により得ることができ、例えば、次のように調製できる。まず、上記（Ａ）エポキシ樹脂、（Ｂ）フェノール樹脂硬化剤、（Ｃ）硬化促進剤、（Ｄ）無機充填材、及び上述した必要に応じて配合される各種成分をミキサー等によって十分に混合（ドライブレンド）した後、熱ロール又はニーダ等の混練装置により溶融混練し、加圧部材間で圧縮してシート状に成形する。より具体的には、封止用樹脂組成物を加熱軟化させながらロールあるいは熱プレスにより１５０〜１０００μｍの厚みに圧延する。
なお、封止用樹脂組成物を圧延する際の加熱温度は、通常、６０〜１５０℃程度である。加熱温度が６０℃以上であると圧延しやすくなり、１５０℃以下であると硬化反応が適度に進行し、成形性を良好にすることができる。The sealing resin composition of the present embodiment can be obtained by a known method for producing a sealing resin composition, and can be prepared, for example, as follows. First, the above-mentioned (A) epoxy resin, (B) phenol resin curing agent, (C) curing accelerator, (D) inorganic filler, and the above-mentioned various components to be blended as needed are sufficiently mixed by a mixer or the like. After (dry blending), it is melt-kneaded by a kneading device such as a hot roll or a kneader, compressed between the pressure members, and formed into a sheet. More specifically, the sealing resin composition is rolled to a thickness of 150 to 1000 μm by a roll or a hot press while being heated and softened.
The heating temperature when rolling the sealing resin composition is usually about 60 to 150 ° C. When the heating temperature is 60 ° C. or higher, rolling is easy, and when the heating temperature is 150 ° C. or lower, the curing reaction proceeds appropriately and the moldability can be improved.
次いで、得られたシートを冷却した後、適当な大きさに粉砕する。
シートの厚みは１５０〜１０００μｍであり、１５０〜７００μｍであってもよく、１５０〜５００μｍであってもよく、２００〜４００μｍであってもよい。シートの厚みが上記範囲内であると、当該シートを粉砕することで、前述の特定の形状を有するフレーク状の封止用樹脂組成物を得ることができる。また、当該シートを粉砕した際に、ＪＩＳ標準篩（ＪＩＳ Ｚ８８０１−１：２００６規定）を用いた分級により、公称目開き１５０μｍの篩を通過する微粉を生じにくくすることができる。本実施形態のフレーク状封止用樹脂組成物中に含まれる前述の封止用樹脂組成物ａを５質量％以下に低減することができる。
なお、上記シートの厚みは、例えば、マイクロメーターを用いて当該シートの厚みを５０点測定し、その平均値として求めることができる。Then, the obtained sheet is cooled and then pulverized to an appropriate size.
The thickness of the sheet is 150 to 1000 μm, may be 150 to 700 μm, may be 150 to 500 μm, or may be 200 to 400 μm. When the thickness of the sheet is within the above range, the flake-shaped sealing resin composition having the above-mentioned specific shape can be obtained by pulverizing the sheet. Further, when the sheet is crushed, classification using a JIS standard sieve (JIS Z8801-1: 2006 standard) can make it difficult to generate fine powder that passes through a sieve having a nominal opening of 150 μm. The above-mentioned sealing resin composition a contained in the flake-shaped sealing resin composition of the present embodiment can be reduced to 5% by mass or less.
The thickness of the sheet can be obtained as an average value by measuring 50 points of the thickness of the sheet using a micrometer, for example.
粉砕方法は、特に制限されず、一般的な粉砕機、例えば、スピードミル、カッティングミル、ボールミル、サイクロンミル、ハンマーミル、振動ミル、カッターミル、グラインダーミル等を用いることができる。なかでも、スピードミルを用いることができる。
また、押出機を用いて封止用樹脂組成物を平紐状に成形し、カッター等で所定の長さに切断するホットカット法で粉砕してもよい。
粉砕物は、その後、篩い分級又はエアー分級等によって所定の粒度分布を持つフレーク状の集合体として、特性を整えて調製することができる。The crushing method is not particularly limited, and a general crusher, for example, a speed mill, a cutting mill, a ball mill, a cyclone mill, a hammer mill, a vibration mill, a cutter mill, a grinder mill, or the like can be used. Among them, a speed mill can be used.
Alternatively, the sealing resin composition may be formed into a flat string using an extruder and crushed by a hot cutting method in which the resin composition is cut to a predetermined length with a cutter or the like.
The pulverized product can then be prepared by adjusting the characteristics as a flake-like aggregate having a predetermined particle size distribution by sieve classification, air classification, or the like.
このようにして得られるフレーク状封止用樹脂組成物は、下記式（１）で表される隙間率を６０％以下とすることができ、５０％以下とすることができ、４０％以下とすることができる。
隙間率（％）＝｛１−（樹脂供給面積／キャビティ面積）}×１００・・・式（１）
ここで、隙間率はキャビティ内へ封止用樹脂組成物を供給した時の、当該封止用樹脂組成物により被覆されていない面積比率を表す。キャビティ面積は成形金型の底部の有効面積であり、樹脂供給面積は封止用樹脂組成物によって被覆されている面積を示す。
上記隙間率が６０％以下であると、封止用樹脂組成物の溶け性が良好となり、充填性が向上し硬化物にボイド等の発生を低減することができる。また、ワイヤ流れを十分に低減することができる。The flake-shaped sealing resin composition thus obtained can have a gap ratio represented by the following formula (1) of 60% or less, 50% or less, and 40% or less. can do.
Gap ratio (%) = {1- (resin supply area / cavity area)} x 100 ... Equation (1)
Here, the gap ratio represents the area ratio that is not covered with the sealing resin composition when the sealing resin composition is supplied into the cavity. The cavity area is the effective area of the bottom of the molding die, and the resin supply area indicates the area covered with the sealing resin composition.
When the gap ratio is 60% or less, the solubility of the sealing resin composition becomes good, the filling property is improved, and the generation of voids and the like in the cured product can be reduced. In addition, the wire flow can be sufficiently reduced.
［半導体装置］
本実施形態の半導体装置は、上記フレーク状封止用樹脂組成物を用いて圧縮成形により半導体素子を封止することにより製造することができる。以下、その方法の一例を説明する。
まず、圧縮成形用金型の上型に、半導体素子を実装した基板を供給した後、下型のキャビティ内に上記封止用樹脂組成物を供給する。次に、上型及び下型を所要の型締圧力にて型締めをし、下型キャビティで加熱溶融した封止用樹脂組成物に半導体素子を浸漬する。次に、下型キャビティ内の加熱溶融した封止用樹脂組成物をキャビティ底面部材で押圧し、減圧下で、所要の圧力を加えて圧縮成形する。成形条件は、温度１２０℃以上２００℃以下、圧力２ＭＰａ以上２０ＭＰａ以下とすることができる。[Semiconductor device]
The semiconductor device of the present embodiment can be manufactured by sealing a semiconductor element by compression molding using the flake-shaped sealing resin composition. An example of the method will be described below.
First, the substrate on which the semiconductor element is mounted is supplied to the upper mold of the compression molding mold, and then the sealing resin composition is supplied into the cavity of the lower mold. Next, the upper mold and the lower mold are molded at a required mold clamping pressure, and the semiconductor element is immersed in the sealing resin composition heated and melted in the lower mold cavity. Next, the heat-melted sealing resin composition in the lower mold cavity is pressed by the cavity bottom surface member, and compression molding is performed by applying a required pressure under reduced pressure. The molding conditions can be a temperature of 120 ° C. or higher and 200 ° C. or lower, and a pressure of 2 MPa or higher and 20 MPa or lower.
図１は、このようにして得られた本開示の半導体装置の一例を示したものであり、銅フレーム等のリードフレーム１と半導体素子２の間に、接着剤層３が介在されてもよい。また、半導体素子２上の電極４とリードフレーム１のリード部５とがボンディングワイヤ６により接続されており、さらに、これらが本開示の封止用樹脂組成物の硬化物（封止樹脂）７により封止されている。
FIG. 1 shows an example of the semiconductor device of the present disclosure thus obtained, and an
本実施形態の半導体装置は、前述の特定の形状を有する封止用樹脂組成物により半導体素子が封止されているので、成形時のワイヤ流れ等の発生が低減される。また、成形性も向上して、高い信頼性を有する半導体装置とすることができる。
また、前述の特定の形状を有する封止用樹脂組成物を用いると、半導体装置の半導体素子上の封止材の厚みを２００μｍ以下としてもよく、１５０μｍ以下としてもよく、１００μｍ以下とすることができる。In the semiconductor device of the present embodiment, since the semiconductor element is sealed by the sealing resin composition having the above-mentioned specific shape, the occurrence of wire flow and the like during molding is reduced. Further, the moldability is also improved, and a semiconductor device having high reliability can be obtained.
Further, when the sealing resin composition having the above-mentioned specific shape is used, the thickness of the sealing material on the semiconductor element of the semiconductor device may be 200 μm or less, 150 μm or less, or 100 μm or less. can.
さらに、封止用樹脂組成物として、前述の特定の形状を有するものを使用した場合には、封止用樹脂組成物を下型のキャビティに供給する際の飛散又は、減圧下で加熱溶融した樹脂が飛散する、いわゆる「樹脂漏れ」が低減されるため、高い信頼性を有する半導体装置を得ることができる。 Further, when a sealing resin composition having the above-mentioned specific shape is used, it is scattered when the sealing resin composition is supplied to the cavity of the lower mold, or it is heated and melted under reduced pressure. Since the so-called "resin leakage" in which the resin is scattered is reduced, a semiconductor device having high reliability can be obtained.
なお、本開示の半導体装置において封止される半導体素子は、特に限定されるものではなく、例えば、ＩＣ、ＬＳＩ、ダイオード、サイリスタ、トランジスタ等が例示される。封止後の厚みが０．１ｍｍ以上１．５ｍｍ以下であるワイヤ流れの生じやすい半導体装置の場合に、本発明は有用である。 The semiconductor element sealed in the semiconductor device of the present disclosure is not particularly limited, and examples thereof include ICs, LSIs, diodes, thyristors, and transistors. The present invention is useful in the case of a semiconductor device having a thickness after sealing of 0.1 mm or more and 1.5 mm or less in which wire flow is likely to occur.
次に実施例により、本開示を具体的に説明するが、本開示はこれらの例によって何ら限定されるものではない。なお、表１中、空欄は配合なしを表す。 Next, the present disclosure will be specifically described with reference to Examples, but the present disclosure is not limited to these examples. In Table 1, blanks indicate no compounding.
（実施例１〜７、及び比較例１〜４）
表１に記載の種類及び配合量の各成分を常温（２５℃）でミキサーを用いて混合し、次いで、熱ロールを用いて８０〜１３０℃で加熱混練した。樹脂温度６０〜１１０℃において、ロールを用い圧延、冷却し、表１に示す厚みのシートを得た。
得られたシートを、スピードミルを用いて粉砕し、ＪＩＳ標準篩（ＪＩＳ Ｚ８８０１−１：２００６規定）３種類（目開き１５０μｍ、１ｍｍ、２ｍｍ）を用い封止用樹脂組成物を調製した。
さらに、得られた封止用樹脂組成物を用いて半導体チップの封止を行った。すなわち、５０ｍｍ×５０ｍｍ×０．５４ｍｍのＦＢＧＡ（Fine pitch Ball Grid Array）を、封止用樹脂組成物を用いて、金型温度１７５℃、成形圧力８．０ＭＰａ、硬化時間２分間の条件で圧縮成形した後、１７５℃、４時間の後硬化を行い、半導体装置を製造した。(Examples 1 to 7 and Comparative Examples 1 to 4)
Each component of the type and blending amount shown in Table 1 was mixed at room temperature (25 ° C.) using a mixer, and then heated and kneaded at 80 to 130 ° C. using a hot roll. Rolled and cooled using a roll at a resin temperature of 60 to 110 ° C. to obtain a sheet having the thickness shown in Table 1.
The obtained sheet was pulverized using a speed mill, and a sealing resin composition was prepared using three types of JIS standard sieves (JIS Z8801-1: 2006 standard) (opening 150 μm, 1 mm, 2 mm).
Further, the semiconductor chip was sealed using the obtained sealing resin composition. That is, a 50 mm × 50 mm × 0.54 mm FBGA (Fine pitch Ball Grid Array) is compressed using a sealing resin composition under the conditions of a mold temperature of 175 ° C., a molding pressure of 8.0 MPa, and a curing time of 2 minutes. After molding, it was cured at 175 ° C. for 4 hours to manufacture a semiconductor device.
〔粉砕前のシートの厚み（ｄａｖｅ.）、最大厚み（ｄｍａｘ）、最小厚み（ｄｍｉｎ）の測定〕
マイクロメーターを用いて得られたシートの厚みを５０点測定し、最大厚み（ｄｍａｘ）、最小厚み（ｄｍｉｎ）を求め、さらに、測定した５０点の平均値をシートの厚み（ｄａｖｅ.）とした。
また、シートの厚み（ｄａｖｅ.）に対する当該シートの最大厚み（ｄｍａｘ）と最小厚み（ｄｍｉｎ）との差の割合を算出した。[Measurement of sheet thickness ( dave. ), Maximum thickness (d max ), and minimum thickness (d min) before crushing]
The thickness of the sheet obtained by using a micrometer was measured at 50 points, the maximum thickness (d max ) and the minimum thickness (d min ) were obtained, and the average value of the measured 50 points was calculated as the sheet thickness ( dave. ).
In addition, the ratio of the difference between the maximum thickness (d max ) and the minimum thickness (d min ) of the sheet to the thickness ( dave.) Of the sheet was calculated.
〔封止用樹脂組成物の厚みの測定〕
光学顕微鏡（倍率：２００倍）を用いて得られた封止用樹脂組成物の厚みを５０点測定し、測定した５０点の平均値を封止用樹脂組成物の厚みとした。
また、実施例１〜７、及び比較例１、４で得られた封止用樹脂組成物５０個を光学顕微鏡（倍率：２００倍）により観察したところ、いずれも厚み方向に破断されており、当該封止用樹脂組成物の８０質量％以上が、平行な一対の平面を有し、当該一対の平面間の距離（厚み）が１５０〜１０００μｍの範囲内であることを確認した。[Measurement of thickness of sealing resin composition]
The thickness of the sealing resin composition obtained by using an optical microscope (magnification: 200 times) was measured at 50 points, and the average value of the measured 50 points was taken as the thickness of the sealing resin composition.
Further, when 50 sealing resin compositions obtained in Examples 1 to 7 and Comparative Examples 1 and 4 were observed with an optical microscope (magnification: 200 times), they were all broken in the thickness direction. It was confirmed that 80% by mass or more of the sealing resin composition had a pair of parallel planes, and the distance (thickness) between the pair of planes was within the range of 150 to 1000 μm.
封止用樹脂組成物の調製に使用した表１に記載の各成分の詳細は以下のとおりである。 Details of each component shown in Table 1 used for preparing the sealing resin composition are as follows.
（Ａ）エポキシ樹脂
・エポキシ樹脂１：ＮＣ−３０００（日本化薬（株）製、商品名；エポキシ当量：２７３、軟化点：５８℃）
・エポキシ樹脂２：ＹＸ−４０００Ｈ（三菱ケミカル（株）製、商品名；エポキシ当量：１９３、軟化点：１０５℃）(A) Epoxy resin / epoxy resin 1: NC-3000 (manufactured by Nippon Kayaku Co., Ltd., trade name; epoxy equivalent: 273, softening point: 58 ° C.)
-Epoxy resin 2: YX-4000H (manufactured by Mitsubishi Chemical Corporation, trade name; epoxy equivalent: 193, softening point: 105 ° C)
（Ｂ）フェノール樹脂硬化剤
・フェノール樹脂１：ＭＥＨ−７８００Ｍ（明和化成（株）製、商品名；水酸基当量：１７５）
・フェノール樹脂２：ＢＲＧ−５５７（昭和電工（株）製、商品名；水酸基当量：１０４）(B) Phenol resin curing agent / phenol resin 1: MEH-7800M (manufactured by Meiwa Kasei Co., Ltd., trade name; hydroxyl group equivalent: 175)
-Phenol resin 2: BRG-557 (manufactured by Showa Denko KK, trade name; hydroxyl group equivalent: 104)
（Ｃ）硬化促進剤
・イミダゾール：２Ｐ４ＭＨＺ（四国化成（株）製、商品名）(C) Hardening accelerator / imidazole: 2P4MHZ (manufactured by Shikoku Chemicals Corporation, trade name)
（Ｄ）無機充填材
・溶融シリカ１：ＭＳＲ−８０３０（（株）龍森製、商品名；平均粒径：１２μｍ）
・溶融シリカ２：ＳＣ−４５００ＳＱ（（株）アドマテックス製、商品名；平均粒径：１μｍ）(D) Inorganic filler / fused silica 1: MSR-8030 (manufactured by Ryumori Co., Ltd., trade name; average particle size: 12 μm)
-Fused silica 2: SC-4500SQ (manufactured by Admatex Co., Ltd., trade name; average particle size: 1 μm)
（その他添加剤）
・シランカップリング剤：Ｚ−６８８３（東レ・ダウコーニング（株）製、商品名；γ−フェニルアミノプロピルトリメトキシシラン）
・着色剤：ＭＡ−６００（三菱ケミカル（株）製、商品名；カーボンブラック）(Other additives)
-Silane coupling agent: Z-6883 (manufactured by Toray Dow Corning Co., Ltd., trade name; γ-phenylaminopropyltrimethoxysilane)
-Colorant: MA-600 (manufactured by Mitsubishi Chemical Corporation, trade name; carbon black)
また、上記各実施例及び各比較例で得られた封止用樹脂組成物及び半導体装置（製品）について、以下に示す方法で各種特性を評価した。その結果を表１に併せて示した。 In addition, various characteristics of the sealing resin composition and the semiconductor device (product) obtained in each of the above Examples and Comparative Examples were evaluated by the methods shown below. The results are also shown in Table 1.
＜評価項目＞
（封止用樹脂組成物）
（１）スパイラルフロー
ＥＭＭＩ規格に準じた金型を用いて、温度１７５℃、圧力９．８ＭＰａでトランスファ成形し、測定した。<Evaluation items>
(Resin composition for sealing)
(1) Spiral flow Using a mold conforming to the EMMI standard, transfer molding was performed at a temperature of 175 ° C. and a pressure of 9.8 MPa, and the measurement was performed.
（２）ゲルタイム
ＪＩＳ Ｃ ２１６１（２０１０）の７．５．１に規定されるゲル化時間Ａ法に準じて、約１ｇの封止用樹脂組成物を１７５℃の熱盤上に塗布し、かき混ぜ棒にてかき混ぜ、ゲル状になりかき混ぜられなくなるまでの時間を測定した。(2) Gel time According to the gelation time A method specified in 7.5.1 of JIS C 2161 (2010), about 1 g of a sealing resin composition is applied onto a hot plate at 175 ° C. and stirred. It was stirred with a stick, and the time until it became a gel and could not be stirred was measured.
（成形性）
（１）隙間率
ＴＯＷＡ（株）製、圧縮成形機 ＰＭＣ１０４０−Ｄを用い、６６ｍｍ×２３２ｍｍのキャビティ内に実施例及び比較例のフレーク状または粉粒状の封止用樹脂組成物３ｇ（封止後素子上の樹脂厚み１００μｍ相当）を０．３ｇ／ｓの速度で供給し、封止用樹脂組成物表面を上部からキャビティ底面に向けデジタルカメラで撮影し画像化した。得られた画像を二値化し、封止用樹脂組成物の面積を計測し、隙間率を下記式（１）により算出した。
隙間率（％）＝（１−（樹脂供給面積／キャビティ面積））×１００・・・式（１）
ここで、隙間率はキャビティ内へ封止用樹脂組成物を供給した時の、当該封止用樹脂組成物により被覆されていない面積比率を表し、キャビティ面積は成形金型の底部の有効面積であり、樹脂供給面積は封止用樹脂組成物によって被覆されている面積を示す。
なお、実施例１の隙間率を算出した際の二値化画像を図２に、比較例３の隙間率を算出した際の二値化画像を図３に示す。(Moldability)
(1) Gap ratio Using a compression molding machine PMC1040-D manufactured by TOWA Corporation, 3 g of flake-shaped or powder-granular sealing resin composition of Examples and Comparative Examples was used in a cavity of 66 mm × 232 mm (after sealing). The resin thickness on the element (corresponding to 100 μm) was supplied at a rate of 0.3 g / s, and the surface of the sealing resin composition was photographed from the upper part toward the bottom surface of the cavity with a digital camera and imaged. The obtained image was binarized, the area of the sealing resin composition was measured, and the gap ratio was calculated by the following formula (1).
Gap ratio (%) = (1- (resin supply area / cavity area)) x 100 ... Equation (1)
Here, the gap ratio represents the area ratio not covered with the sealing resin composition when the sealing resin composition is supplied into the cavity, and the cavity area is the effective area of the bottom of the molding mold. Yes, the resin supply area indicates the area covered with the sealing resin composition.
The binarized image when the gap ratio of Example 1 is calculated is shown in FIG. 2, and the binarized image when the gap ratio of Comparative Example 3 is calculated is shown in FIG.
（２）充填性
ＴＯＷＡ（株）製、圧縮成形機 ＰＭＣ１０４０−Ｄを用い、６６ｍｍ×２３２ｍｍのキャビティ内に実施例及び比較例のフレーク状または粉粒状の封止用樹脂組成物３ｇ（封止後素子上の樹脂厚み１００μｍ相当）を０．３ｇ／ｓの速度で供給し、金型温度１７５℃、成形圧力５．０ＭＰａ、硬化時間２分間で圧縮成形した後、得られた成形品の未充填の有無を目視で確認した。未充填部分が無いものを「良好」、未充填部分があるものを「未充填」と評価した。(2) Fillability Using a compression molding machine PMC1040-D manufactured by TOWA Co., Ltd., 3 g of flake-shaped or powder-granular sealing resin composition of Examples and Comparative Examples was used in a cavity of 66 mm × 232 mm (after sealing). The resin thickness on the element (equivalent to 100 μm) was supplied at a rate of 0.3 g / s, and after compression molding at a mold temperature of 175 ° C., a molding pressure of 5.0 MPa, and a curing time of 2 minutes, the obtained molded product was not filled. The presence or absence of was visually confirmed. Those without unfilled portions were evaluated as "good", and those with unfilled portions were evaluated as "unfilled".
（３）ボイド
ＴＯＷＡ（株）製、圧縮成形機 ＰＭＣ１０４０−Ｄを用い、６６ｍｍ×２３２ｍｍのキャビティ内に実施例及び比較例のフレーク状または粉粒状の封止用樹脂組成物３ｇ（封止後素子上の樹脂厚み１００μｍ相当）を０．３ｇ／ｓの速度で供給し、金型温度１７５℃、成形圧力５．０ＭＰａ、硬化時間２分間で圧縮成形し成形品を得た。得られた成形品のボイドを超音波探傷装置（日立建機ファインテック（株）製、ＦＳ３００II）で観察し、下記の基準によって評価した。
Ａ：ボイドの発生なし
Ｂ：ボイドの数が５個未満
Ｃ：ボイドの数が５個以上(3) Using a compression molding machine PMC1040-D manufactured by Void TOWA Co., Ltd., 3 g of flake-shaped or powder-granular sealing resin composition of Examples and Comparative Examples in a cavity of 66 mm × 232 mm (element after sealing). The above resin thickness (corresponding to 100 μm) was supplied at a rate of 0.3 g / s, and compression molding was performed at a mold temperature of 175 ° C., a molding pressure of 5.0 MPa, and a curing time of 2 minutes to obtain a molded product. The voids of the obtained molded product were observed with an ultrasonic flaw detector (FS300II manufactured by Hitachi Construction Machinery Finetech Co., Ltd.) and evaluated according to the following criteria.
A: No voids B: Number of voids is less than 5 C: Number of voids is 5 or more
（４）ワイヤ流れ率
５０ｍｍ×５０ｍｍ×０．５４ｍｍのＦＢＧＡを、封止用樹脂組成物を用いて、金型温度１７５℃、成形圧力８．０ＭＰａ、硬化時間２分間の条件で圧縮成形した後、得られた成形品（ＦＢＧＡ）内部の金ワイヤ（直径１８μｍ、長さ５ｍｍ）をＸ線観察装置（（株）島津製作所製、ＳＭＸ−１０００）で観察し、最大変形部のワイヤ流れ率（封止前のワイヤの位置と封止後のワイヤの位置との最大距離のワイヤの長さに対する比率（％））を求めた。(4) After compression molding FBGA having a wire flow rate of 50 mm × 50 mm × 0.54 mm using a sealing resin composition under the conditions of a mold temperature of 175 ° C., a molding pressure of 8.0 MPa, and a curing time of 2 minutes. , The gold wire (18 μm in diameter, 5 mm in length) inside the obtained molded product (FBGA) was observed with an X-ray observation device (SMX-1000, manufactured by Shimadzu Corporation), and the wire flow rate of the maximum deformed part (SMX-1000) The ratio (%) of the maximum distance between the position of the wire before sealing and the position of the wire after sealing with respect to the wire length was determined.
（半導体装置（製品））
（１）耐リフロー性（ＭＳＬ試験）
半導体装置に対し、８５℃、８５％ＲＨにて７２時間吸湿処理した後、２６０℃の赤外線リフロー炉中で９０秒間加熱する試験（ＭＳＬ試験：Ｌｅｖｅｌ ３）を行い、不良(剥離及びクラック)の発生率を調べた（試料数＝２０）。(Semiconductor device (product))
(1) Reflow resistance (MSL test)
The semiconductor device was subjected to a moisture absorption treatment at 85 ° C. and 85% RH for 72 hours, and then heated in an infrared reflow oven at 260 ° C. for 90 seconds (MSL test: Level 3). The incidence was examined (number of samples = 20).
（２）耐湿信頼性（プレッシャクッカー試験：ＰＣＴ）
半導体装置を、プレッシャクッカー内で、１２７℃、０．２５ＭＰａの条件下、７２時間吸水させた後、２６０℃、９０秒間のベーパーリフローを行い、不良（オープン不良）の発生率を調べた（試料数＝２０）。(2) Moisture resistance reliability (pressure cooker test: PCT)
The semiconductor device was allowed to absorb water in a pressure cooker under the conditions of 127 ° C. and 0.25 MPa for 72 hours, and then vapor reflow was performed at 260 ° C. for 90 seconds to examine the occurrence rate of defects (open defects) (sample). Number = 20).
（３）高温放置信頼性（高度加速寿命試験：ＨＡＳＴ）
半導体装置を、１８０℃の恒温槽中に１０００時間放置し、不良（オープン不良）の発生率を調べた（試料数＝２０）。(3) High-temperature standing reliability (highly accelerated life test: HAST)
The semiconductor device was left in a constant temperature bath at 180 ° C. for 1000 hours, and the incidence of defects (open defects) was examined (number of samples = 20).
表１から明らかなように、本実施例の封止用樹脂組成物は、成形時の充填性が良好でワイヤ流れが極めて低かった。実施例と比較例においてスパイラルフローの値に差がないが、実施例は比較例よりも隙間率が低いことがわかる。なお、図２に実施例１の隙間率を算出した際の二値化画像を、図３に比較例３の隙間率を算出した際の二値化画像を示す。図２及び図３において白色部分はキャビティ内で封止用樹脂組成物により被覆されていない部分を示し、黒色部分はキャビティ内で封止用樹脂組成物により被覆されている部分を示す。図２及び図３から実施例１は比較例３よりもキャビティ内で封止用樹脂組成物が均一に充填されており隙間率が低いことがわかる。
本発明の封止用樹脂組成物は、フレーク形状のため金型内へ薄くかつ均一に供給することができるため、圧縮成形時の樹脂流動が少なくなり、良好な充填性と低いワイヤ流れ率を得られるものである。
また、当該封止用樹脂組成物を用いて製造された半導体装置は、ＭＳＬ試験、プレッシャクッカー試験、高度加速寿命試験のいずれの試験においても良好な結果が得られており、樹脂封止型半導体装置として高い信頼性を有するものであることが確認できた。As is clear from Table 1, the sealing resin composition of this example had good filling property at the time of molding and extremely low wire flow. Although there is no difference in the value of the spiral flow between the example and the comparative example, it can be seen that the gap ratio of the example is lower than that of the comparative example. Note that FIG. 2 shows a binarized image when the gap ratio of Example 1 is calculated, and FIG. 3 shows a binarized image when the gap ratio of Comparative Example 3 is calculated. In FIGS. 2 and 3, the white portion indicates a portion in the cavity that is not coated with the sealing resin composition, and the black portion indicates a portion in the cavity that is coated with the sealing resin composition. From FIGS. 2 and 3, it can be seen that in Example 1, the sealing resin composition is more uniformly filled in the cavity than in Comparative Example 3, and the gap ratio is lower.
Since the sealing resin composition of the present invention has a flake shape, it can be thinly and uniformly supplied into the mold, so that the resin flow during compression molding is reduced, and good filling property and low wire flow rate can be obtained. It is what you get.
Further, the semiconductor device manufactured by using the sealing resin composition has obtained good results in all of the MSL test, the pressure cooker test, and the highly accelerated life test, and the resin-sealed semiconductor. It was confirmed that the device has high reliability.
本発明の封止用樹脂組成物は、フレーク形状のため金型内へ薄くかつ均一に供給することができるため、成形性に優れるとともに成形時のワイヤ流れも低減される。したがって、封止樹脂厚が薄く、また、長くかつ細いワイヤによって接続された半導体素子の封止材料として有用であり、信頼性の高い樹脂封止型半導体装置を製造することができる。 Since the sealing resin composition of the present invention has a flake shape, it can be thinly and uniformly supplied into the mold, so that it is excellent in moldability and the wire flow during molding is also reduced. Therefore, the resin-sealed semiconductor device having a thin sealing resin thickness, useful as a sealing material for semiconductor elements connected by long and thin wires, and highly reliable resin-sealed semiconductor device can be manufactured.
１ リードフレーム
２ 半導体素子
３ 接着剤層
４ 電極
５ リード部
６ ボンディングワイヤ
７ 封止用樹脂組成物の硬化物（封止樹脂）1 Lead
Claims (5)
前記フレーク状封止用樹脂組成物の８０質量％以上が、平行な一対の平面を有し、当該一対の平面間の距離が１５０〜１０００μｍである平行面含有樹脂組成物であり、
前記フレーク状封止用樹脂組成物中に含まれる、ＪＩＳ標準篩を用いた分級により、公称目開き１５０μｍの篩を通過するフレーク状封止用樹脂組成物が５質量％以下、及び公称目開き２ｍｍの篩を通過しないフレーク状封止用樹脂組成物が５質量％以下であることを特徴とするフレーク状封止用樹脂組成物。A flake-shaped sealing resin composition containing (A) an epoxy resin, (B) a phenol resin curing agent, (C) a curing accelerator, and (D) an inorganic filler.
More than 80% by mass of the flake-shaped sealing resin composition is a parallel plane-containing resin composition having a pair of parallel planes and a distance between the pair of planes of 150 to 1000 μm.
By classification using a JIS standard sieve contained in the flake-shaped sealing resin composition, the amount of the flake-shaped sealing resin composition passing through the sieve having a nominal opening of 150 μm is 5% by mass or less, and the nominal opening is nominally opened. A flake-shaped sealing resin composition, characterized in that the amount of the flake-shaped sealing resin composition that does not pass through a 2 mm sieve is 5% by mass or less.
隙間率（％）＝｛１−（樹脂供給面積／キャビティ面積）}×１００・・・式（１）
（ここで、隙間率はキャビティ内へ封止用樹脂組成物を供給した時の、当該封止用樹脂組成物により被覆されていない面積比率を表し、キャビティ面積は成形金型の底部の有効面積であり、樹脂供給面積は封止用樹脂組成物によって被覆されている面積を示す。）The flake-shaped sealing resin composition according to claim 1 or 2, wherein the gap ratio represented by the following formula (1) is 60% or less.
Gap ratio (%) = {1- (resin supply area / cavity area)} x 100 ... Equation (1)
(Here, the gap ratio represents the area ratio not covered with the sealing resin composition when the sealing resin composition is supplied into the cavity, and the cavity area is the effective area of the bottom of the molding mold. The resin supply area indicates the area covered with the sealing resin composition.)
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