Patent ID: 9093463
Filing Date: 2015-07-28
Classification: H01L

Abstract:
1. A silicon controlled rectifier, comprising: a substrate; a N well positioned on a first side of the substrate; a P well positioned on the first side of the substrate and contact with the N well; a first N region positioned on an upper surface of the N well; a first P region positioned on the upper surface of the N well and contact with the first N region; a second N region positioned on an upper surface of the P well; a second P region positioned on the upper surface of the P well; a first oxide isolation region positioned on both partial region of the upper surface of the N well and partial region of the upper surface of the P well, and isolating the first P region and the second N region; a second oxide isolation region positioned on partial region of the upper surface of the P well and isolating the second N region and the second P region; an anode terminal coupled with the first N region and the first P region; and a cathode terminal coupled with the second N region and the second P region; wherein the first P region has a doping concentration less than 80% of a doping concentration of the second P region.