Electrical Characteristics (Cont’d):

Continuous

Transient

Characteristics

NTE Type

Number

Case Diameter

RMS

Voltage

(Volts)

DC

Voltage

(Volts)

Energy

(10/1000

µs)

(Joules)

Peak Current

(8/20

µs)

(Amps)

Nominal

Varistor

Voltage

@ 1mA DC

Test Current

(Volts)

Maximum

Clamping

@ Test Current

(8/20

µs)

(Volts)

Transient

Power

Dissipation

(Watts)

1V300

8.5mm

280

370

22.0

1200

470

740

0.25

2V300

16mm

280

370

79.0

4500

470

740

0.60

524V30

23mm

280

370

149.0

6500

470

740

1.00

2V420

16mm

420

560

90.0

4500

680

1110

0.60

524V42

23mm

420

560

160.0

6500

680

1110

1.00

2V480

16mm

480

640

105.0

4500

750

1240

0.60

524V48

23mm

480

640

180.0

6500

750

1240

1.00

Cautions:

NTE varistors short–circuit when subjected to surges beyond their peak current and energy ratings.

NTE varistors short–circuit when operated at steady–state voltages well beyond their voltage ratings, which may eventual-

ly result in open–circuiting leaving the circuit without protection.

The following precautions should be taken to minimize this potential hazard:

D Fusing the varistor to limit high fault currents.

D Protecting the surrounding circuitry by physical shielding.

D Locating the varistor away from other components.

LS

Typical Power Supply Circuit

100

µH

D

0.1

µF

150

µF

+

–

D

L

LL

H

LD

1V Series

.345

.235

.475

1.000 .200

.024

(9.0)

(6.0)

(12.0)

(25.4) (5.08) (0.6)

2V Series

.699

.275

.787

1.000 .315

.031

(17.8) (7.0)

(20.0)

(25.4) (8.0)

(0.8)

524V Series .945

.291

1.230

1.063 .394

.039

(24.0) (7.4)

(31.0)

(27.0) (10.0) (1.0)

DH

L

LL

LS

LD