SMD or chip varistors are voltage-dependent resistors based on ceramic multilayer technology. They are widely used to protect electronic circuits in consumer devices and telecom, industrial and automotive applications against transient overvoltages, such as electrostatic discharges (ESD) and surge transients.
SMD varistors are overvoltage protection devices that utilize the properties of semiconductive ceramics. When the voltage across the varistor exceeds a certain value, the resistance falls to a low value and allows a current to flow, thus providing overvoltage protection to the electronic devices that are connected in parallel with the varistor.
Below are some examples of effective ESD and surge protection using SMD varistors.
Click https://product.tdk.com/info/en/products/protection/voltage/varistor_ctvs/technote/apn-varistor.html for details.
Hordon Kim
International Editor, hordon@powerelectronics.co.kr
