Patent ID: 7471493
Filing Date: 2008-12-30
Classification: H01L

Abstract:
1. An electrostatic discharge (ESD) protection device comprising: a first semiconductor controlled rectifier (SCR) having first and second gates, an anode and a cathode wherein the anode is connected to a first node and the cathode is connected to a second node; at least a first Zener diode having a cathode connected to the first node and an anode connected to the first gate of the first SCR; a second SCR having first and second gates, an anode and a cathode wherein the anode is connected to the second node and the cathode is connected to the first node; at least a second Zener diode having a cathode connected to the second node and an anode connected to the first gate of the second SCR; and at least a third Zener diode having a cathode connected to the second gate of the first SCR and an anode connected to the second node.