Patent ID: 8987779
Filing Date: 2015-03-24
Classification: H01L

Abstract:
1. An electrostatic discharge (ESD) protection device, having a first connection terminal and a second connection terminal, and comprising: a P-type substrate, having a first P-type well region, an N-type well region and an N-type deep well region, wherein the N-type deep well region is electrically connected to the first connection terminal, and the P-type substrate is electrically connected to the second connection terminal; M second P-type well regions, disposed in the N-type deep well region, wherein M is an integer greater than 1; a plurality of first P+-type doped regions, respectively disposed in the first P-type well region, the N-type well region and the second P-type well regions; and a plurality of first N+-type doped regions, respectively disposed in the first P-type well region, the N-type well region and the second P-type well regions, and the first N+-type doped regions and the first P+-type doped regions being configured in alternation, wherein a diode string is formed through the second P-type well regions and the first N+-type doped regions in the second P-type well regions, a silicon controlled rectifier circuit is formed through the P-type substrate, the N-type well region, the first P+-type doped region in the N-type well region, the first P-type well region and the first N+-type doped region in the first P-type well region, and the diode string is configured to trigger the silicon controlled rectifier circuit.