Patent ID: 8299522
Filing Date: 2012-10-30
Classification: H01L

Abstract:
1. A semiconductor device comprising: a high-impurity-concentration semiconductor substrate of a first conductivity type; a parallel pn structure formed on the semiconductor substrate and in which regions of the first conductivity type and regions of a second conductivity type are arranged alternately and joined to each other; a channel region of the second conductivity type formed on part of a surface of the parallel pn structure; source regions of the first conductivity type which occupy surface portions of the channel region; trenches which are adjacent to the source regions and penetrate through the channel region so as to reach the parallel pn structure; gate electrodes formed on surfaces of the trenches with gate oxide films interposed in between; an insulating layer formed on surfaces of the gate electrodes; a source electrode formed on part of a surface of the insulating layer and is in contact with surfaces of the channel region and the source regions; a drain electrode formed on part of the surface of the insulating layer and a surface of the regions of the first conductivity type of the parallel pn structure; and a diode formed on part of the surface of the insulating film in such a manner that it is in contact with the source electrode and the drain electrode and that its anode is located on the side of the source electrode and its cathode is located on the side of the drain electrode, and which is low in breakdown voltage than an active area.