Patent ID: 9627372
Date: 2017-04-18
CPC Classifications: H01L

Claim:
1. An electrostatic discharge protection device for shunting an electrostatic discharge current from a first node to a second node, the device comprising: a first pnp bipolar transistor having a collector and an emitter located in a first n-type region in a semiconductor substrate, wherein the emitter of the first pnp transistor is connected to the first node; a second pnp bipolar transistor having a collector and an emitter located in a second n-type region in the semiconductor substrate, wherein the emitter of the second pnp transistor is connected to the collector of the first pnp bipolar transistor, and a pn junction diode comprising a p-type region located in a third n-type region in the semiconductor substrate, wherein the p-type region of the pn junction diode is connected to the collector of the second pnp bipolar transistor and wherein the third n-type region is connected to the second node, wherein the second n-type region is separated from the third n-type region by a p-type region, wherein the p-type region is connected to the second node.