Patent ID: 8704271
Filing Date: 2014-04-22
Classification: H01L

Abstract:
1. A bidirectional electrostatic discharge (ESD) protection device, comprising: a substrate having a topside semiconductor surface that includes a first silicon controlled rectifier (SCR) and a second SCR formed therein including a patterned p-buried layer (PBL) comprising a plurality of PBL regions; said first SCR comprising a first and second n-channel remote drain MOS devices each having a gate, a source within a p-body, and sharing a first merged drain, and said second SCR comprising a third and a fourth n-channel remote drain MOS device each having a gate, a source within a p-body, and sharing a second merged drain; wherein said plurality of PBL regions are directly under at least a portion of said sources while being excluded from being directly under said first and said second merged drains.