Patent ID: 8063444

Claim:
A lateral diffused N-type metal oxide semiconductor (LDNMOS) device with electrostatic discharge (ESD) protection capability, comprising: a semiconductor substrate with an epi-layer thereon; patterned isolations disposed on the epi-layer, thereby defining a first active region and a second active region; an N-type double diffused drain (NDDD) region formed in the first active region; an N + heavily doped drain region disposed in the NDDD region; a P-body diffused region formed in the second active region, wherein the NDDD region and the P-body diffused region are separated with a predetermined distance exposing the epi-layer; a neighboring pair of an N + heavily doped and a P + heavily doped source region disposed in the P-body diffused region; and a gate structure is disposed between the N + heavily doped source region and the N + heavily doped drain region, wherein an additional heavily doped region is formed between the semiconductor substrate and the epi-layer, and wherein a position of the additional heavily doped region is corresponding to a position of the NDDD region, and not the N+ heavily doped and a P+ heavily doped source region.