Patent ID: 9559170
Date: 2017-01-31
CPC Classifications: H01L

Claim:
1. A semiconductor device for electrostatic discharge (ESD) protection, comprising: a source; a gate; a drain connection comprising a silicide layer; a drain diffusion fully surrounding laterally and underneath the drain connection, wherein the drain diffusion comprises a resistive region located between an edge of the gate and an edge of the silicide layer of the drain connection; and a diffusion region extending from, or located under, the drain diffusion, the source, the gate, the drain connection and the diffusion region being located in a well region formed in or on a substrate; wherein the diffusion region is laterally spaced from at least one of the gate or an outer edge of the drain diffusion, wherein a doping concentration of the diffusion region is less than a doping concentration of the drain diffusion, and wherein the diffusion region is formed such that a thickness of the diffusion region is more than a thickness of the drain diffusion, and wherein the diffusion region is of a doping polarity opposite to a doping polarity of the drain diffusion, and wherein the diffusion region and the well region comprise a same doping type only.