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Varistors(SMD)
Conformity to RoHS Directive
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
10 –1
10 –2 Zener diode
/Vz:6.8V
Positive direction
10 –3
10 –4
Chip varistor
/V 1mA :12V
A capacitance content
10 –5
– 18 – 14
– 10
– 6
– 2
2
6
10
14
18
–10 –5
–10 –4
–10 –3
Negative direction
–10 –2
–10 –1
Voltage(V)
THE EFFECT OF THE VARISTOR
WITHOUT VARISTOR
A malfunction and failure of electronic equipment
ESD, Surge voltage
WITH VARISTOR
Suppress abnormal voltage by inserting varistor in a circuit
ESD, Surge voltage
Power line
Signal line
IC
Power line
Signal line
IC
Insert a varistor between
a line and ground
: Chip varistor
? All specifications are subject to change without notice.
002-01 / 20130927 / e9c11_avr.fm
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