Investigation of A Latch up Immune Silicon Controlled Rectifier for Robust ESD A

A latch-up immune robust SCR with an N+ top.layer and an additional Nwell region (Nwell2) is proposed in this.paper. The N+ top layer and Nwell2 divide the original SCR into.three new SCRs with sharing emitter, which provide the deeper.ESD current (IESD) path to improve the holding voltage (Vh) and.