4-84

Power Dissipation Ratings

Should transients occur in rapid succession, the average

power dissipation required is simply the energy (watt-

seconds) per pulse times the number of pulses per second.

The power so developed must be within the specifications

shown on the Device Ratings and Specifications table for the

specific device. Furthermore, the operating values need to

be derated at high temperatures as shown in Figure 1.

Because varistors can only dissipate a relatively small

amount of average power they are, therefore, not suitable for

repetitive applications that involve substantial amounts of

average power dissipation.

1.

Device Leakage Current

MODEL

NUMBER

PART SIZE

(

µA)

(

µA)

(

µA)

(

µA)

(V)

V8CP22

22B

0.5

5.0

5.0

50

8

V14CP22

22B

0.5

5.0

5.0

50

14

V31CP22

22B

0.5

5.0

5.0

50

28

V38CP22

22B

0.5

5.0

5.0

50

36

V130CP22

22A

0.5

5.0

25.0

100

130

V150CP22

22A

0.5

5.0

25.0

100

150

V31CP20

20B

0.5

5.0

5.0

50

28

V38CP20

20B

0.5

5.0

5.0

50

36

V130CP20

20A

0.5

5.0

25.0

100

130

V150CP20

20A

0.5

5.0

25.0

100

150

V38CP16

16A

0.5

5.0

5.0

50

36

V130CP16

16A

0.5

5.0

25.0

100

130

V150CP16

16A

0.5

5.0

25.0

100

150

100

90

80

70

60

50

40

30

20

10

0

-55

50

60

70

80

90

100

110

120

130

140 150

FIGURE 1. CURRENT, ENERGY AND POWER DERATING

CURVE

FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM

100

90

50

10

T

TIME

T = Time From 10% to 90% of Peak

Example: For an 8/20

µs Current Waveform:

8

20

CP Series

OBSOLETE

PART