Patent ID: 7928587

Claim:
A power semiconductor module comprising: a SiN substrate; a power semiconductor chip mounted on a major surface of said SiN substrate with a solder; and an aluminum wire connected between a surface of said power semiconductor chip and a first circuit pattern, wherein: said major surface of said SiN substrate, said power semiconductor chip, said aluminum wire and said first circuit pattern are sealed with an epoxy resin, and a wire diameter of said aluminum wire is 0.4±0.05 mmφ, and coefficient of linear expansion of said epoxy resin in a rated temperature range of said module is from 15 to 20 ppm/K, and a coefficient of linear expansion of an epoxy resin at the vicinity of said power semiconductor chip is lower than a coefficient of linear expansion of an epoxy resin from the vicinity of said power semiconductor chip to the sealing surface.