Patent ID: 10361299

Abstract:
In an n-type current diffusion region, a first p+-type region is provided under a bottom of a trench (gate trench). Further, in the n-type current diffusion region, a second p+-type region is provided between adjacent trenches so as to be separated from the first p+-type region and in contact with a p-type base region. In the p-type base region, a third p+-type region is provided near a side wall of the trench so as to be separated from the trench and first and second p+-type regions. A depth of the third p+-type region from an interface of the p-type base region and an n+-type source region does not reach the n-type current diffusion region. A shortest distance from the third p+-type region to the second p+-type region is at most a distance between the first and second p+-type regions.