Multilayer varistors

Varistor stands for Variable Resistor.

It’s a voltage nonlinear resistor/voltage-dependent resistor which changes resistance value depending on applied voltage.
It is a ceramic electronic component and it's used to protect electronic equipment from the abnormal voltage, such as ESD (Electrostatic) and surge.

Characteristics:

• Achieve ESD protection excellent effect by own ceramics materials and process technology.
• It is possible to replace from the Zener diode, which contributes to reducing the size and weight of the equipment.
• The wide product line up of the laminate structure and applicable to wide range of applications from high-speed signal lines to the power supply.

Varistors' voltage/current characteristics are different from a normal fixed resister and resistance value is changed by applied voltage widely!

Current-Voltage characteristics

Multilayer varistors protect electronic equipment from ESD (electrostatic discharge) by utilizing the characteristics of changing resistance values depending on applied voltage!

ESD suppression mechanism

1. Invading ESD into equipment.
2. The resistance value of Varistor decreases rapidly by applied voltage exceeding varistor voltage.
3. Varistor bypasses excessive current to a GND.
4. Suppress ESD voltage and protect IC.

ESD suppression effect (example)

Multilayer varistors have excellent ESD suppression effect.