Electrostatic discharge protection device and related circuit

Abstract

An ESD protection device comprises a P-type substrate, a first substrate-triggered silicon controlled rectifiers (STSCR) disposed in the P-type substrate and a second STSCR disposed in the P-type substrate. The first STSCR comprises a first N-well, a first P-well, a first N+ diffusion region, a first P+ diffusion region, and a first trigger node. The second STSCR comprises a second N-well electrically connected to the first N-well, a second P-well electrically connected to the first P-well, a second N+ diffusion region electrically connected to the first P+ diffusion region, a second P+ diffusion region electrically connected to the first N+ diffusion region, and a second trigger node. A layout area of an integrated circuit and a pin-to-pin ESD current path can be reduced.