Patent ID: 9142463
Filing Date: 2015-09-22
Classification: H01L

Abstract:
1. A semiconductor device characterized by including at least a semiconductor element, and a protection diode formed across an insulating film on a semiconductor substrate on which the semiconductor element is formed, wherein a cathode electrode of the protection diode is connected to a gate electrode of the semiconductor element, an anode electrode of the protection diode is connected to a low potential side main electrode of the semiconductor element, the protection diode is configured of four layers of unidirectional diode formed in contact in the order of a high concentration first conductivity type semiconductor layer, a medium concentration first conductivity type semiconductor layer, a low concentration second conductivity type semiconductor layer, and a high concentration second conductivity type semiconductor layer, and the width of the low concentration second conductivity type semiconductor layer is a width such that a depletion layer reaches through at a clamping voltage.