Varistor products, Radial lead varistors > c-iii series, Maximum clamping voltage for 10mm parts – Littelfuse C-III Varistor Series User Manual
Page 4: Repetitive surge capability for 10mm parts, Rise time = 1.25 x t t, Rise time 20 μ s = t, Decay time, Figure 3 figure 4, Figure 1b - power derating for phenolic coated
© 2013 Littelfuse, Inc.
116
Revised: June 5, 2013
Varistor Products
C-III Varistor Series
Radial Lead Varistors > C-III series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/c-iii.html for current information.
Should transients occur in rapid succession, the average
power dissipation is 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
Current Energy and Power Dissipation Ratings
Peak Pulse Current Test Waveform
100
90
50
10
O
1
T
T
1
T
2
TIME
PERCENT OF PEAK V
ALUE
0
1
= Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T
1
= Rise Time = 1.25 x T
T
2
= Decay Time
Example - For an 8/20 μs Current Waveform:
8μs = T
1
= Rise Time
20μs = T
2
= Decay Time
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90 100 110 120 130 140 150
AMBIENT TEMPERATURE (
o
C)
PERCENT OF R
ATED
VALUE
Figure 1A - Power Derating for Epoxy Coated
Figure 2
10000
1000
100
0.001
0.01
0.1
1
10
100
1000
10000
PEAK CURRENT (A)
MAXIMUM PEAK
V
O
LT
A
GE (V)
10000
1000
100
0.001
0.01
0.1
1
10
100
1000
10000
PEAK CURRENT (A)
MAXIMUM PEAK
V
O
LT
A
GE (V)
MODEL SIZE = 10MM
T
A
= -55
o
C TO 85
o
C
130 to 625V
M(AC)
RATING
MAXIMUM CLAMP
VOLTAGE
625
460
440
385
230
250
275
300
320
175
150
140
130
420
550
510
Maximum Clamping Voltage for 10mm Parts
V130LA5C(P) – V625LA10C(P)
10
4
10
5
10
6
∞
10
3
10
2
2
1
15
10
100
1,000
10,000
SURGE IMPULSE DURATION (μs)
10,000
1,000
100
10
1
RA
TED PEAK SURGE CURRENT (A)
MODEL SIZE = 10mm
T
A
= -55
o
C TO 85
o
C
Repetitive Surge Capability for 10mm Parts
V130LA5C(P)-V320LA10C(P)
Figure 3
Figure 4
Transient V-I Characteristics Curves
Pulse Rating Curves
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100 110 120 130 140 150
AMBIENT TEMPERATURE (
o
C)
PERCENT OF R
ATED
VALUE
device. The operating values of a MOV need to be derated
at high temperatures as shown above. Because varistors
only dissipate a relatively small amount of average power
they are not suitable for repetitive applications that involve
substantial amounts of average power dissipation.
Figure 1B - Power Derating for Phenolic Coated