When selecting the TVS for designing within the circuit, some characteristic parameter should

be considered carefully to meet the circuit condition. The following guideline are recommended.

1. The surge handling ability of the selected TVS should meet the need of dissipating the

expected transient surge current of the protected circuit.

2. The clamping voltage of the selected TVS should be less than the maximum allowed

operating voltage of the protected circuit.

3. In high speed data transmission situation. the capacitance of the selected TVS should be

considered.

4. The special requests of the TVS’s capacitance such as ESD prevention are available, please

contact with us.

5. While choosing the TVS, the working voltage of the TVS should be greater than or equal to

the normal operating voltage of the circuit.

6. Protection Principle : When the voltage increase above the threshold of the varistor, the suppressor

draws a rapidly increasing current. The the overvoltage is considerably attenuated.

Transient

Vc

Clamping

Transient voltage

Transient Current

Protected

SMD Transient Voltage Suppressors

Information for Designer

Overvoltage

Clamping Voltage Level

System Rated Voltage

System Max. allowed

operating voltage

System

to be

Protected

INPUT

OUTPUT

OUTPUT

INPUT