Chip Varistors Countermeasure for surge voltage and static electricity AVR series Type: AVR-M AVRL Issue date: September 2011 All specifications are subject to change without notice. Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.(1/10) Conformity to RoHS Directive Varistors(SMD) Countermeasure for Surge Voltage and Static Electricity AVR Series AVR-M, AVRL Types Varistors are voltage dependent nonlinear resistive elements with a resistance that decreases rapidly when the voltage is over the constant value. Varistor is equivalent with Zener diode of two series connection. Therefore, do not have polarity. CURRENT vs. VOLTAGE CHARACTERISTICS EQUIVALENT CIRCUIT 2 Zener Diodes 1 10 Zener diode 2 10 /Vz:6.8V 3 10 Chip varistor Positive direction /V1mA:12V 4 A capacitance content 10 5 10 18 14 10 61262 0 14 18 5 10 4 10 Negative direction 3 10 2 10 1 10 ( ) Voltage V THE EFFECT OF THE VARISTOR WITHOUT VARISTOR WITH VARISTOR A malfunction and failure of electronic equipment Suppress abnormal voltage by inserting varistor in a circuit ESD, Surge voltage ESD, Surge voltage Power line Power line IC IC Signal line Signal line Insert a varistor between a line and ground : Chip varistor All specifications are subject to change without notice. 001-07 / 20110926 / e9c11 avr.fm ( ) Current A