Patent ID: 7466005

Claim:
A trench type semiconductor device comprising an active area consisting of a plurality of spaced active trenches filled with conductive polysilicon and surrounded by a termination trench which is laterally spaced from an adjacent one of said active trenches; said trenches being formed in a wafer of silicon of one of the conductivity types; and a guard ring diffusion of the other of the conductivity types diffused into the area between said adjacent one of said active trenches and said termination trench and having a constant depth which is less than the depth of said one of said active trenches and the depth of said termination trench; an electrode connected to said conductive polysilicon in said active trenches, and to the surface of said guard ring diffusion and to tops of mesas between said spaced active trenches, thereby to form a schottky device, wherein said guard ring diffusion extends from said adjacent one of said active trenches to said termination trench.