Littelfuse UltraMOV 25S Varistor Series - Manual (Page 2)

© 2013 Littelfuse, Inc. 108
Revised: May 8, 2013
Varistor Products
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ultramov25s.html for current information.
UltraMOV™ 25S Varistor Series
Radial Lead Varistors > UltraMOV TM 25S Series
UltraMOV™ 25S Series Ratings & Specifications
Part
Number
Branding
Maximum Rating (85°C) Specifications (25°C)
Continuous Transient
Varistor Voltage
at 1mA DC
Test Current
Maximum
Clamping
Voltage at 100A,
8 x 20μs
UL 1449 ed.3
Voltage
Protection
Rating
Typical
Capaci-
tance
f = 1MHz
AC Volts DC Volts
Energy
2ms
Peak Surge
Current
8 x 20μs
V
M(AC)RMS
V
M(DC)
W
TM
1 x
Pulse
I
TM
1 x Pulse
V
NOM
Min
V
NOM
Max
V
C
VPR C
(V) (V) (J) (A) (V) (V) (pF)
V25S115P P25S115 115 150 230 22000 162 198 295 400 4500
V25S130P P25S130 130 170 255 22000 184 226 335 500 3900
V25S140P P25S140 140 180 285 22000 200 240 355 500 3500
V25S150P P25S150 150 200 300 22000 216 264 390 500 3200
V25S175P P25S175 175 225 315 22000 243 297 450 600 2550
V25S230P P25S230 230 300 400 22000 324 396 585 700 1900
V25S250P P25S250 250 320 435 22000 351 429 640 800 1750
V25S275P P25S275 275 350 470 22000 387 473 700 900 1610
V25S300P P25S300 300 385 500 22000 423 517 765 1000 1450
V25S320P P25S320 320 420 540 22000 459 561 825 1000 1350
V25S385P P25S385 385 505 630 22000 558 682 1010 1200 1080
V25S420P P25S420 420 560 655 22000 612 748 1100 1500 1000
V25S440P P25S440 440 585 675 22000 643 787 1160 n/a 900
V25S460P P25S460 460 615 690 22000 675 825 1220 n/a 870
V25S510P P25S510 510 670 700 22000 738 902 1335 n/a 820
V25S550P P25S550 550 745 765 22000 819 1001 1475 n/a 750
V25S625P P25S625 625 825 800 22000 900 1100 1625 n/a 660
V25S750P P25S750 750 970 890 22000 1080 1320 1950 n/a 550
Note: Average powder dissipation of transients should not exceed 1.5 watts.
For applications exceeding 85ºC ambient temperature, the
peak surge current and energy ratings must be reduced as
shown above.
Peak Current, Energy and Power Derating Curve
0
20
40
60
80
100
55 50 60 70 80 90 100 110 120 130
P
E
RCE
NT
O
F
RA
T
E
D
V
A
L
UE
AM BIEN T T EM PER AT U R E (ºC )
0
50
100
PER
C
EN
T O
F
PEAK VAL
U
E
T IM E
t
1 t
2
t
O
1
Peak Pulse Current Test Waveform for Clamping Voltage
Transient V-I Characteristics Curves
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
Figure 1
Figure 2