Patent ID: 7880195

Claim:
An ESD protection device, comprising: a P-type substrate a first substrate-triggered silicon controlled rectifier (STSCR), disposed in the P-type substrate, the first STSCR comprising: a first N-well, disposed in the P-type substrate; a first P-well, disposed adjacent to the first N-well in the P-type substrate; a first N + diffusion region, disposed in the first P-well; a first P + diffusion region, disposed in the first N-well; and a first trigger node, disposed in the P-type substrate; and a second STSCR, disposed in the P-type substrate, the second STSCR comprising: a second N-well, disposed in the P-type substrate; a second P-well, disposed adjacent to the second N-well in the P-type substrate; a second N + diffusion region, disposed in the second P-well; a second P + diffusion region, disposed in the second N-well; and a second trigger node, disposed in the P-type substrate; wherein the first N-well is electrically connected to the second N-well, the first P-well is electrically connected to the second P-well, the second N + diffusion region is electrically connected to the first P + diffusion region, and the second P + diffusion region is electrically connected to the first N + diffusion region.