Patent ID: 7126191
Filing Date: 2006-10-24
Classification: H01L

Abstract:
1. A double-diffused MOSFET comprising at least: a first-conductive-type buried layer formed in a second-conductive-type semiconductor substrate; a drain region composed of an epitaxial layer formed on said first-conductive-type buried layer; a second-conductive-type body region formed in said drain region; a first-conductive-type drain extraction region formed in said drain region; a first-conductive-type source region formed in said second-conductive-type body region; a gate electrode formed at least on a part of the region between said first-conductive-type source region and said first-conductive-type drain extraction region; and a drift region between said second-conductive-type body region and said first-conductive-type drain extraction region; wherein said first-conductive-type buried layer is formed so as to have a first-conductive-type impurity concentration thereof lower in the region under said second-conductive-type body region than in the region under said drift region.