Patent ID: 7067876

Claim:
A semiconductor device comprising: a semiconductor substrate; a semiconductor layer having a higher resistance than that of said semiconductor substrate and provided on a top surface of said semiconductor substrate; a gate electrode provided on a gale insulating film on the top surface of said semiconductor layer; a drain layer of a first conductivity type selectively provided in a location in said semiconductor layer in one side of said gate electrode; a drain electrode connected to said drain layer; a source layer of the first conductivity type selectively provided in a location in said semiconductor layer in the other aide of said gate electrode; an element-side connecting portion selectively provided on said semiconductor layer, said element-side connecting portion being provided in an active region on which semiconductor elements are formed; a contact-side connecting portion selectively provided on said semiconductor layer, having lower resistance than said semiconductor layer and extending deeper toward said semiconductor substrate than said element-side connecting portion, said contact-side connecting portion being provided in an inactive region on which semiconductor elements are not formed; a first source electrode connecting said source layer, said element-side connecting portion and said contact-side connecting portion; and a bottom electrode provided on the bottom surface of said semiconductor substrate in connection therewith.