Patent ID: 9633989
Date: 2017-04-25
CPC Classifications: H01L

Claim:
1. An electro static discharge (ESD) protection device comprising: a zener diode formed in a semiconductor substrate; a first series circuit formed in the semiconductor substrate and coupled in parallel to the zener diode, the first series circuit having first and second diodes; a second series circuit formed in the semiconductor substrate and coupled in parallel to the zener diode, the second series circuit having third and fourth diodes connected in series; a first input/output electrode disposed on the surface of the semiconductor substrate and coupled to a first node between the first and second diodes; and a second input/output electrode disposed on the surface of the semiconductor substrate and coupled to a second node between the third and fourth diodes, wherein the first diode comprises two diodes electrically coupled in parallel between the first node and the zener diode, with the two diodes extending in a planar direction of the semiconductor substrate.