Patent ID: 9184141
Filing Date: 2015-11-10
Classification: H01L

Abstract:
1. An electrostatic discharge protection device, comprising: a first well having a first conductivity type and a second well having the first conductivity type, the entirety of the first well having a first impurity doping concentration and the second well having a second impurity doping concentration that is higher than the first impurity doping concentration; a gate formed on the first well; a source region, having a second conductivity type opposite to the first conductivity type, formed, in the first well, at one side of the gate; a drift region, having the second conductivity type, formed in the first well and in the second well, at another side of the gate; and a drain region, having the second conductivity type, formed in a portion of the drift region that is formed in the second well, wherein the second well is formed to contact to a partial portion of a bottom of the drift region formed between the first well and the second well.