08CH220L datasheet(4/25 Pages) ETC

4 / 25 page

Voltage Dependent Characteristic

Transient Voltage Suppressors（varistors）

are voltage-dependent electrical resistors

with symmetrical V/I characteristic and the

breakdown region, their resistance value

decreases with increasing voltage, thus

“short-circuiting” further rises in overvoltage.

The Prevention of Overvoltage

In other words, as long as the voltage increases

above the threshold of the TVS, the suppressor

will draws a rapidly increasing current, and then

the overvoltage is considerably attenuated away

from the protected circuit, that is why the

inherent protection of the equipments should be

supplemented by including specific components

that will raise the withstand capabilities to the

required level. Varistors provide protection

against all kinds of overvoltage and prevent

electronic equipment from being damaged by

transient events.

SMD Transient Voltage Suppressors

Information for Designer

Breakdown

Region

Current （A）

Circuit to be

Protected

Normal State

Overvoltage State

Overvoltages occur

Circuit to be

Protected

08CH220L Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers