Patent ID: 6770918
Filing Date: 2004-08-03
Classification: H01L

Abstract:
An electrostatic discharge (ESD) protection device having a heterojunction bipolar transistor silicon controlled rectifier (HBT-SCR), comprising:a substrate; an N-doped layer disposed over said substrate; a first P doped region disposed over said N-doped layer, wherein said first P doped region comprises a P doped silicon-germanium material; at least one first N+ doped region forming a cathode, said at least one first N+ doped region disposed over said first P doped region and coupled to ground, wherein said at least one first N+ doped region, said first P-doped region, and said N-doped layer form a vertical NPN transistor of said HBT-SCR; and at least one second P doped region forming an anode of said SCR and adapted for coupling to a protected pad, said at least one second P doped region disposed over said N-doped layer and laterally positioned with respect to said first P doped region and electrically isolated from said first P doped region, wherein said at least one second P doped region, said N-doped layer, and said first P doped region form a lateral PNP transistor of said HBT-SCR.