With the rapid development of science and technology, integrated circuits are widely used in electronic devices. Technicians in their field know that Electrostatic discharge (ESD) is one of the main problems in integrated circuits. In an ESD event, the circuit of an integrated circuit may be reset or even damaged. Currently, all consumer electronic products must meet the ESD testing requirements of the IEC61000-4-2 standard by applying appropriate protection solutions to consumer electronic products.

The circuit 120 to be protected works in normal mode, and the voltage levels of the operating voltage VPP and the reference grounding GND remain in the normal range respectively. The Transient Voltage suppressor (TVS) 110 senses the voltage levels of the operating voltage VPP and the reference ground GND and provides a high impedance between the operating voltage VPP and the reference ground GND. Thus, the current 1P can be supplied to the circuit 120 to be protected for operation.

[0004] On the other hand, when an ESD event occurs, the transient voltage suppressor (TVS) 110 senses the voltage level of the operating voltage VPP and the reference ground GND, and provides an extremely low impedance between the operating voltage VPP and the reference ground GND. Therefore, the current IESD caused by an ESD event can be discharged to the reference grounding GND, and the circuit 120 to be protected is protected from being damaged by the current IESD.

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