Patent ID: 6914298
Filing Date: 2005-07-05
Classification: H01L

Abstract:
1. A double diffusion MOSFET comprising: a drain region of an N-type semiconductor layer formed on a semiconductor substrate; a body region of a P-type semiconductor region formed in said drain region; an N-type source region formed in said body region; and a gate electrode formed on a surface of said body region with a gate insulating film being interposed therebetween; wherein said drain region contains N+ type drain contact regions formed on a surface of said drain region and P+ type regions electrically connected to said N+ type drain contact regions so that said N+ type drain contact regions and said P+ type regions are put at an equal potential, said N+ type drain contact regions are shaped like a comb, the N+ type drain contact regions defining comb-like projections and said P+ type regions being placed in gaps formed between the adjacent projections thereof, and an end of said P+ type region closer to said body region is set back further from said body region than an end of said N+ type drain contact region closer to said body region.