Patent ID: 9437590
Filing Date: 2016-09-06
CPC Classification: H01L

Claim Text:
1. An electrostatic discharge protection device disposed on a substrate, comprising: a first well, having a first conductive type and disposed on the substrate; a second well, having a second conductive type and disposed on the substrate, wherein the second well is adjacent to the first well, and the second conductive type is different from the first conductive type; a first poly-silicon region, disposed on the first well, wherein a first node connects to the first well through the first poly-silicon region; a second poly-silicon region, disposed on the second well, wherein a second node connects to the second well through the second poly-silicon region; and a first protection layer, disposed between the first poly-silicon region and the second poly-silicon region, wherein the first protection layer covers a portion of the first well, a portion of the second well, a portion of the first poly-silicon region and a portion of the second poly-silicon region, and there is no doping region in the portions of the first well and the second well which are covered by the first protection layer and between the first poly-silicon region and the second poly-silicon region.