Patent ID: 9704850
Date: 2017-07-11
CPC Classifications: H01L

Claim:
1. An electrostatic discharge protection device comprising a silicon controlled rectifier, the silicon controlled rectifier comprising: a first region having a first conductivity type located in a semiconductor substrate; a second region having a second conductivity type located adjacent the first region having the first conductivity type in the semiconductor substrate; a third region having the first conductivity type located adjacent the second region having the second conductivity type in the semiconductor substrate, wherein the second region is between the first region and the third region; a first contact region of the first conductivity type and a second contact region of the second conductivity type located in the first region having the first conductivity type; a third contact region of the first conductivity type and a fourth contact region of the second conductivity type located in the second region having the second conductivity type; a fifth contact region of the first conductivity type and a sixth contact region of the second conductivity type located in the third region having the first conductivity type; and a blocking region having a higher resistivity than the region having the second conductivity type, wherein the blocking region is located between the third contact region of the first conductivity type and the fourth contact region of the second conductivity type in the second region having the second conductivity type, for reducing a trigger voltage of the silicon controlled rectifier.