Patent ID: 7061090

Claim:
A semiconductor device comprising: a lead electrode to connect with a lead; a case electrode having a convex wall section at a periphery thereof; and a semiconductor chip having a rectification function placed between said lead electrode and said case electrode and bonded to them by a bonding material, wherein said case electrode includes, in an area between an edge of said semiconductor chip and said convex wall section, a first region which has a height less than the height of a mounting region of said case electrode on which said semiconductor chip is placed and a second region having a height which is greater than that of said first region but less than the height of a top of the convex wall section, wherein the first and second regions form a groove between said mounting region and said convex wall section, and said first region is formed so as to have a width extending within a distance five times the thickness of the bonding material bonding the semiconductor chip to the case electrode from the edge of the semiconductor chip.