Patent ID: 10693002

Abstract:
In an n-type current diffusion region, a first p+-type region underlying a bottom of a trench (gate trench) is provided. In the n-type current diffusion region, a second p+-type region is provided between adjacent trenches, separated from the first p+-type region and in contact with the p-type base region. In the p-type base region, near a side wall of the trench, a third p+-type region is provided a predetermined distance from the side wall of the trench and is separated from the first and the second p+-type regions. The third p+-type region extends in a depth direction, substantially parallel to the side wall of the trench. A drain-side end of the third p+-type region is in contact with the n-type current diffusion region or protrudes a predetermined depth from the interface of the p-type base region and the n-type current diffusion region toward the drain.