Patent ID: 8829565

Claim:
An electrostatic discharge protection device comprising: a semiconductor substrate having a first well and a second well; an SCR device having a PNPN structure and disposed on the first and second wells; and a diode device having an NP structure and disposed at both sides of the SCR device, wherein, when the substrate is viewed from above, the diode device and the SCR device are alternately disposed, and wherein the diode device comprises: a third N+ area formed by implanting an n-type impurity on the second well to be connected to an anode; a third P+ area formed by implanting a p-type impurity on the second well and disposed at one side of the third N+ area; a fourth P+ area formed by implanting a p-type impurity on the first well to be connected to a cathode; and a fourth N+ area formed by implanting an n-type impurity on the first well and disposed at one side of the fourth P+ area.