Patent ID: 9577054
Date: 2017-02-21
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: an element region and a terminal region surrounding the element region in a first plane; a first semiconductor region having a first conductivity type; a second semiconductor region having a second conductivity type and provided on the first semiconductor region; a third semiconductor region having the first conductivity type and provided on the second semiconductor region; a first electrode that is electrically connected to the first semiconductor region; a second electrode that is electrically connected to the third semiconductor region; a third electrode in the element region and adjacent to the first semiconductor region, the second semiconductor region, and the third semiconductor region through a first insulating film; and a fourth electrode having a plurality of portions in the element region between the third electrode and the terminal region along a first direction parallel to the first plane, the fourth electrode adjacent to the first semiconductor region, the second semiconductor region, and the third semiconductor region through a second insulating film, the plurality of portions of the fourth electrode being arranged in parallel and spaced from each other along the first direction, wherein a first distance along a second direction crossing the first plane from the first electrode to the third electrode is less than a second distance along the second direction from the first electrode to the fourth electrode, and a depth along the second direction of each successive portion of the fourth electrode is less than a depth of each preceding portion of the fourth electrode from the element region towards the terminal region along the first direction.