Patent ID: 7622515

Claim:
A semiconductor apparatus in which a semiconductor element is mounted on one side of a substrate and only the one side of the substrate on which the semiconductor element is mounted is encapsulated with an epoxy resin composition, the epoxy resin composition comprising: (A) a spherical alumina, (B) an ultrafine silica having a specific surface area of 120-280 m2/g, (C) a silicone compound, (D) an epoxy resin, (E) a phenolic resin curing agent, and (F) a curing accelerator, wherein the ultrafine silica being contained in an amount of 0.2-0.8% by weight based on a total weight of the resin composition, the silicone compound (C) is a polyorganosiloxane having in its side chain an epoxy substituted organic group and a polyether substituted organic group, and the amount of the silicone compound is 0.3-2.0% by weight based on the total weight of the resin composition and the spherical alumina is between 85% and 92% by weight of the total composition.