Patent ID: 7923833
Filing Date: 2011-04-12
Classification: H01L

Abstract:
1. A semiconductor module comprising: a ceramic substrate having a front surface on which a semiconductor element is mounted and a rear surface on the opposite side of the front surface; a front metal plate joined to the front surface; a rear metal plate joined to the rear surface; and a heat dissipating apparatus joined to the rear metal plate, wherein the ceramic substrate includes aluminum nitride while the front metal plate and the rear metal plate include aluminum, and the rear metal plate has a joint surface that faces the heat dissipating apparatus, wherein the joint surface includes a joint area and a non joint area, wherein the joint area is in a range from 65% to 85% of the total area of the joint surface, wherein the non joint area includes a hole or a trench formed in the joint surface and the deepest portion of the hole or the trench in the joint surface is in fillet form.