Patent ID: 8643111
Filing Date: 2014-02-04
Classification: H01L

Abstract:
1. An electrostatic discharge (ESD) protection device, comprising: a semiconductor substrate having a first conductive type; an epitaxy layer disposed on the semiconductor substrate, wherein the epitaxy layer has the first conductive type; an isolation pattern disposed on the epitaxy layer to define a first active region and a second active region; a first well region disposed in the epitaxy layer, surrounding the first active region and the second active region, wherein the first well has a second conductive type opposite to the first conductive type; a gate structure disposed on the isolation pattern, between the first active region and the second active region; a first doped region disposed in the first active region, on the first well, wherein the first doped region has the second conductive type; a second doped region disposed in the second active region, on the first well, wherein the second doped region has the first conductive type; a drain doped region disposed in the first doped region; a source doped region and a first pick-up doped region adjacent to each other disposed in the second doped region, wherein the source doped region has the second conductive type, and the first pick-up doped region has the first conductive type; and a source contact plug connecting to the source doped region, wherein the source contact plug has an extended portion, and a ratio of an area of the first pick-up doped region covered by the extended portion to an area of first pick-up doped region is between zero and one from a top viewpoint.