Patent ID: 9349716
Filing Date: 2016-05-24
CPC Classification: H01L,H02H

Claim Text:
1. An electrostatic discharge (ESD) protection device coupled between a first node and a second node, the ESD protection device comprising: a first lowly doped region of a P dopant type; a second lowly doped region of a N dopant type within the first lowly doped region; a third region including a first highly doped region of the N dopant type, wherein the third region is formed directly within the first lowly doped region, the first highly doped region is coupled to the first node, and no highly doped region of the P dopant type is formed within the third region; and a fourth region including a second highly doped region of the P dopant type, wherein the fourth region is formed directly within the second lowly doped region, the second highly doped region is coupled to the second node, and no highly doped region of the N dopant type is formed within the fourth region; wherein a voltage at the first highly doped region is higher than a voltage at the second highly doped region, and further wherein a junction between the first highly doped region and the first lowly doped region is configured to enter into reverse breakdown in response to an ESD event, and a junction between the second lowly doped region and the second highly doped region is configured to enter into a reverse breakdown in response to the ESD event, such that the ESD protection device is configured to sink current from the first node to the second node in response to an ESD event.