Patent ID: 8710545

Claim:
An ESD module comprising: a first portion (FP) in a substrate, the FP includes a FP well of a second polarity type and first and second FP contact regions, the first FP contact region is a first polarity type FP contact region and the second FP contact region is a second polarity type FP contact region; a second portion (SP) in the substrate, the SP includes a SP well of a first polarity type and first and second SP contact regions, the first SP contact region is a first polarity type SP contact region and the second SP contact region is a second polarity type SP contact region; an intermediate portion (IP) disposed in the substrate between the FP and SP in the substrate, the IP includes an IP well of the second polarity type; and wherein the IP increases trigger current and holding voltage of the ESD module to prevent latch up during normal device operation.