Patent ID: 8638533
Filing Date: 2014-01-28
Classification: H01L

Abstract:
1. A semiconductor device having a semiconductor layer of a first conduction type formed on the main surface of a semiconductor substrate, wherein the semiconductor layer includes a lateral IGBT and an avalanche diode, the lateral IGBT has a collector region of the first conduction type formed from the surface of the semiconductor layer in the direction of depth, an emitter region of the first conduction type formed from the surface of the semiconductor layer in the direction of depth, a first well region of a second conduction type formed in the semiconductor layer so as to surround the emitter region from the peripheral direction and the bottom, and a first gate electrode formed over the first well region situated between the semiconductor layer and the emitter region, the avalanche diode has the semiconductor device further has a buffer region of the first conduction type formed in the vicinity of the second well region; and the distance from the center of the collector region to the end of the collector region is from 1/4 to 1/2.8 of a distance from the center of the collector region to the center of the emitter region in a cross sectional view of the semiconductor device in a direction along the gate length of the lateral IGBT.