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Radial Lead Varistors > UltraMOVTM Series
UltraMOV™ Series Ratings & Specifications (Continued...)
Maximum Rating (85°C)
Continuous Transient
RMS DC Peak Current
Volts Volts 8 x 20μs
Specifications (25°C)
Maximum
Varistor
Typical
Capaci-
tance
Lead–free and RoHS
Compliant Models
Standard
Models
Voltage at
1mA DCTest
Current
Clamping
Voltage
8 x 20μs
Energy
2ms
ITM
ITM
2 x
Pulse
(A)
VNOM VNOM
VM(DC)
WTM
1 x
Pulse
(A)
VC
IPK
f = 1MHz
Part
Part
Number
VM(AC)
Branding
Number
Branding
Min
Max
(V)
460
460
460
510
510
510
550
550
550
625
625
625
(V)
615
615
615
670
670
670
745
745
745
825
825
825
(J)
90
(V)
675
675
675
738
738
738
819
819
819
900
900
900
(V)
825
825
825
902
(V)
(A)
25
50
100
25
50
100
25
50
100
25
50
(pF)
120
220
400
110
200
350
100
180
300
90
V10E460P P10V460 V10E460
V14E460P P14V460 V14E460 14V460
V20E460P P20V460 V20E460 20V460
V10E510P P10V510 V10E510
V14E510P P14V510 V14E510
V20E510P P20V510 V20E510
V10E550P P10V550 V10E550
V14E550P P14V550 V14E550 14V550
V20E550P P20V550 V20E550 20V550
10V460
3500
6000
10000
3500
6000
10000
3500
6000
10000
3500
6000
10000
2500
4500
6500
2500
4500
6500
2500
4500
6500
2500
4500
6500
1240
1240
1240
1355
1355
1355
1500
1500
1500
1650
1650
1650
180
360
80
165
325
90
180
360
100
200
400
10V510
14V510
20V510
10V550
902
902
1001
1001
1001
1100
1100
1100
V10E625P P10V625 V10E625
V14E625P P14V625 V14E625 14V625
V20E625P P20V625 V20E625 20V625
10V625
160
250
100
NOTE:
1. Average power dissipation of transients should not exceed 0.25W, 0.4W, 0.6W and 1.0W for 7mm, 10mm, 14mm, and 20mm model sizes, respectively.
Peak Pulse CurrentTestWaveform
Power Dissipation Ratings
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 SpecificationsTable for the
specific device. Furthermore, the operating values
need to be derated at high temperatures as shown in
above. 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.
100
90
50
10
TIME
O
T
1
Current Energy and Power Derating Curve
T
1
T
2
Figure 2
100
90
80
70
60
50
40
30
20
10
01 = Virtual Origin of Wave
T =Time from 10% to 90% of Peak
T1 = RiseTime = 1.25 xT
T2 = DecayTime
Example - For an 8/20 μs Current Waveform:
8μs =T1 = RiseTime
20μs =T2 = DecayTime
0
-55 50 60 70 80 90 100 110 120 130 140 150
o
AMBIENT TEMPERATURE ( C)
Figure 1
©2008 Littelfuse, Inc.
85
UltraMOV™Varistor Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ultramov.html for current information.
Revision: January 9, 2009