Patent ID: 9711659
Date: 2017-07-18
CPC Classifications: H01L,H02M

Claim:
1. A semiconductor device comprising: a first conductive type first main electrode region; a first conductive type drift region which makes contact with the first conductive type first main electrode region; a first conductive type second main electrode region which makes contact with the first conductive type drift region; a second conductive type well region which is provided in a part of a surface layer portion of the first conductive type drift region and to which a reference potential is applied; and a first conductive type potential extracting region which is provided in a surface layer portion of the second conductive type well region and to which the reference potential is applied; wherein: the second conductive type well region serves as a base region which controls a current flowing between the first conductive type potential extracting region and the first conductive type drift region; the first conductive type drift region is disposed so as to surround a peripheral portion of the first conductive type first main electrode region; and the first conductive type second main electrode region is disposed so as to surround a peripheral portion of the first conductive type drift region.