Patent ID: 7298043

Claim:
A semiconductor device comprising: a wiring substrate; a first heat sink and a second heat sink on the wiring substrate; a semiconductor element on an insulating layer, which is on both the first heat sink and the second heat sink; a first and second wire electrically connecting the wiring substrate and the semiconductor element; a first throughhole in the wiring substrate connected to the first heat sink; a second throughhole in the wiring substrate connected to the second heat sink; a third throughhole in the wiring substrate connected to the first wire; a fourth throughhole in the wiring substrate connected to the second wire; a first wiring in the wiring substrate; a second wiring in the wiring substrate; and an external electrode on a back surface of the wiring substrate and connected to at least one of the first, second, third, and fourth throughholes, wherein the first wiring is connected to both the first throughhole and the third throughhole, and the second wiring is connected to both the second throughhole and the fourth throughhole.