Over Voltage Protection Device-Varistor Selection Rule

When it comes to selecting the MLV for designing within the circuit, some characteristic parameters should be considered carefully to meet the circuit condition. Please see the recommended guideline below.

1.While choosing the MLV, the working voltage of the MLV should be greater than or equal to the normal operating voltage of the circuit.

2.Surge (or ESD) handling ability of the selected MLV should meet need for dissipating the expected transient surge current (or ESD voltage) of the protected circuit.

3.The clamping voltage of the selected MLV should be less than maximum allowed operating voltage of the protected circuit.

4.In the high speed data transmission situation, capacitance of the selected MLV should be considered.