Patent ID: 7825473
Filing Date: 2010-11-02
Classification: H01L

Abstract:
1. A semiconductor device for electrostatic discharge (ESD) protection, comprising: a silicon controlled rectifier (SCR) including: a semiconductor substrate; a first well formed in the substrate; a second well formed in the substrate; a first p-type region formed in the first well to serve as an anode of the SCR; and a first n-type region partially formed in the second well to serve as a cathode of the SCR; a p-type metal-oxide-semiconductor (PMOS) transistor formed in the first well including a gate, and including a first diffused region serving as a source of the PMOS transistor, and a second diffused region separated apart from the first diffused region and serving as a drain of the PMOS transistor; a second n-type region formed in the first well electrically connected to the first diffused region of the PMOS transistor; and a second p-type region formed in the substrate outside of the first and second wells, the second p-type region being electrically and physically connected to a conductive line that is electrically and physically connected to the second diffused region of the PMOS transistor.