Patent ID: 9153568
Filing Date: 2015-10-06
Classification: H01L

Abstract:
1. An electrostatic discharge protection device, comprising: an N well; a P type doping region, disposed in the N well; a first N type doping region, disposed in the P type doping region; a plurality of N type sub-doping regions, disposed in the P type doping region in parallel, wherein the N type sub-doping regions do not contact to the first N type doping region, and the N type sub-doping regions are electrically connected to a first source rail-line; a first N+ type doping region, disposed in the first N type doping region; a first P+ type doping region, disposed in the first N doping region, wherein the first N+ doping region and the first P+ doping region are electrically connected to a pad; a second N+ doping region, disposed in the P type doping region, wherein second P+ type doping region and the second N+ doping region are electrically connected to a second source rail-line; wherein the N type sub-doping regions are disposed between the first N type doping region and the second N+ doping region; wherein when the first source rail-line is electrically connected to a system voltage and the second source rail-line is electrically connected to a ground voltage, there is a depletion region generated between the N type sub-doping region and the P type doping region so as to block a channel current between the first N+ type doping region and the second N+ type doping region.