Patent ID: 9583407
Date: 2017-02-28
CPC Classifications: H01L,H05K

Claim:
1. A semiconductor device, comprising: a case; an external terminal attached to said case; an insulating plate having a first surface and a second surface, said second surface being opposite to said first surface and surrounded by said case; a first conductor layer provided on said first surface of said insulating plate, made of one conductive material, and having a first volume; a second conductor layer provided on said second surface of said insulating plate, made of said one conductive material, and having a second volume; a third conductor layer provided on said second surface of said insulating plate and away from said second conductor layer, made of said one conductive material, and having a third volume, said third conductor layer having a semiconductor chip mounting region thicker than said second conductor layer, the sum of said second and third volumes being greater than or equal to 70% and smaller than or equal to 130% of said first volume; a semiconductor chip provided on said mounting region of said third conductor layer; a sealing part that is formed of an insulator and seals said semiconductor chip within said case; and a wiring part that is within said sealing part, and short-circuits said semiconductor chip and at least one of said external terminal and said second conductor layer.