Littelfuse SMOV25S User Manual
Varistor Products
Thermally Protected Varistors > SMOV25S Series
SMOV25S Varistor Series
Agency Approvals
Agency Agency File Number
E320116
RoHS
Description
The Littelfuse SMOV thermally protected varistor is a selfprotected device. It consists of a 25mm square varistor with an
integral thermal disconnect designed to open in the event of
overheating due to abnormal overvoltage as outlined in UL1449
3rd edition. The SMOV helps facilitate SPD module compliance
to UL1449 and offers quick thermal response due to the close
proximity of the integrated thermal element to the MOV body.
This configuration also offers lower inductance than most discreet
solutions resulting in improved clamping performance to fast over
voltage transients.
The device has a separate micro-switch, which can be used to
indicate that the MOV has been disconnected from the circuit. This
separate switch makes the monitoring circuitry completely isolated
from the main power which ensures indicator circuit safety and
simplifies the customers circuit design.
Features
• Maximum single
surge capability 20 kA,
8/20 waveshape.
• Nominal Discharge
Current Value: 10kA.
• Intermediate current
rating: 50A/150A.
• -45°C to +75°C operating
temperature.
• Recognized to UL
1449 3rd edition.
• Lead-Free and RoHS
compliant.
• Integrated micro-switch for
indication circuitry/design.
Applications
• SPD applications
• AC/DC distribution
• IT/Data center
• Power supplier
• Telecommunication
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart.
SMOV25S Series
Continous:
Steady State Applied Voltage:
DC Voltage Range (VM(DC)) 150 to 970 V
AC Voltage Range (V
) 115 to 750 V
M(AC)RMS
Transient:
Non-Repetitive Surge Current, 8/20µs Waveform (ITM) 20,000 A
Non-Repetitive Energy Capability, 2ms Waveform (WTM) 170 to 670 J
Operating Ambient Temperature Range (TA) -45 to +75 °C
Storage Temperature Range (T
) -45 to +85 °C
STG
Hi-Pot Encapsulation (Isolation Voltage Capability) 2500 V
Isolation Voltage Capability (when the thermal disconnect opens) 1500 V
Housing Insulation Resistance >1,000 MΩ
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Units
SMOV25S Series
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/smov25s.html for current information.
237
Revised: May 8, 2013
SMOV25S Varistor Series
Device Ratings & Specifications
Varistor Products
Thermally Protected Varistors > SMOV25S Series
Maximum Rating (75°C) Specifications (25 °C)
Part
Number
SMOV25S111MP
SMOV25S111NP
SMOV25S131MP
SMOV25S131NP
SMOV25S151MP
SMOV25S151NP
SMOV25S181MP
SMOV25S181NP
SMOV25S251MP
SMOV25S251NP
SMOV25S271MP
SMOV25S271NP
SMOV25S301MP
SMOV25S301NP
SMOV25S321MP
SMOV25S321NP
SMOV25S421MP
SMOV25S421NP
SMOV25S461MP
SMOV25S461NP
SMOV25S511MP
SMOV25S511NP
SMOV25S551MP
SMOV25S551NP
SMOV25S621MP
SMOV25S621NP
SMOV25S751MP
SMOV25S751NP
Continuous Transient
TM
Peak Surge
Current
8/20s
1 × Pulse
AC
Volts
V
M (AC)
DC
Volts
V
M(DC)
Energy
2ms
W
ITM
Nominal
Discharge
Current (In)
In
Varistor
Voltage at
1mA Test
Current
V
N(DC)
Min
V
N(DC)
Max
Maximum
Clamping
Voltage
8/20s
Vc I
PK
Typical
Capacitance
f = 1MHz
C
(V) (V) (J) (A) (A) (V) (V) (A) (pF)
115 150 170 20000 10000 162 198 295 100 3200
130 170 190 20000 10000 184 226 335 100 2800
150 200 220 20000 10000 216 264 390 100 2300
175 225 250 20000 10000 243 297 450 100 1900
250 320 330 20000 10000 351 429 640 100 1400
275 350 350 20000 10000 387 473 700 100 1250
300 385 370 20000 10000 423 517 765 100 1150
320 420 390 20000 10000 459 561 825 100 1080
420 560 460 20000 10000 612 748 1100 100 820
460 615 490 20000 10000 675 825 1220 100 750
510 670 520 20000 10000 738 902 1335 100 680
550 745 550 20000 10000 819 1001 1475 100 630
620 800 600 20000 10000 900 1100 1625 100 550
750 970 670 20000 10000 1080 1320 1950 100 460
Average power dissipation of transients should not exceed 1.5 watts
Same ratings and specifications apply to Non Isolated Monitored Switch alternative design. Replace "M" with "N" in the part number. e.g.: SMOV25S111NP.
Refer to Part Number System at the end of this document.
SMOV25S Varistor Series
238
Revised: May 8, 2013
Please refer to www.littelfuse.com/series/smov25s.html for current information.
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
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