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20220209 / vpd_varistors_avr_en.fm

Voltage Protection Devices

Chip varistors

CHARACTERISTICS OF CHIP VARISTOR

Varistors are voltage dependent nonlinear resistive elements with

a resistance that decreases rapidly when the voltage is over the

constant value.

Varistors become zener diode of 2 serial connection and equiva-

lent, and does not have polarity.

CURRENT vs. VOLTAGE CHARACTERISTICS

THE EFFECT OF THE VARISTOR

Without varistor

A malfunction and failure of electronic equipment

With Varistor

Suppress abnormal voltage by inserting varistor in a circuit

EQUIVALENT CIRCUIT OF CHIP VARISTORS

CHIP VARISTORS FEATURE

IEC61000-4-2 LEVEL4 compliant.

Reliability characteristics evaluated based on AEC-Q200 con-

dition. (Automotive products)

High ESD withstanding voltage

Small-sized products are available

125°C, 150°C Supported

Fig.1 Internal structure of multilayer chip varistors

Overview of the AVR/SGNE series

RoHS Directive Compliant Product

Compatible with lead-free solders

Chip varistor

/V1mA:12V

Zener diode

/Vz:6.8V

Positive direction

Negative direction

Voltage(V)

10–1

10–2

10–3

10–4

10–5

–10–1

–10–2

–10–3

–10–4

–10–5

2

–26

–610

–10

14

–14

18

–18

ESD, Surge voltage

Power line

Signal line

IC

ESD, Surge voltage

Power line

Signal line

Insert a varistor between

a line and ground

: Chip varistor

IC

No.

Name

(1)

Semiconductor ceramics

(2)

Internal electrode(Pd)

(3)

Terminal electrode

Ag

(4)

Ni

(5)

Sn

2 Zener Diodes

A capacitance content

②

③

④

⑤

①