SCR ESD PROTECTION CIRCUIT

摘要

PURPOSE: An SCR electrostatic discharge protection circuit is provided to obtain a low operation voltage property and a sufficient ESD withstand voltage. CONSTITUTION: An NMOSFET is connected between an anode and a cathode. A first npn transistor(N1) is connected to the NMOSFET. A resistor(Rnw) is connected to the anode. The base of a pnp transistor(P1) is connected to the resistor of the base. The collector of second and third npn transistors(N2,N3) is connected to the resistor.