# TVS Varistor, 550 V, 745 V, UltraMOV 25S Series, 1.475 kV, Radial Leaded

![Product image](https://novapart.co/image/farnell:2786544/)

**URL**: https://novapart.co/products/V25S550P/tvs-varistor-550-v-745-ultramov-25s-series-1475-kv
**SKU**: V25S550P
**Manufacturer**: LITTELFUSE
**Category**: Circuit Protection || TVS - Transient Voltage Suppressors || TVS Varistors
**Price**: €1.4300
**Stock**: 10+
**Lead Time**: 99 days (indicative)

## Description

Voltage Rating VAC:550V; Voltage Rating V DC:745V; Product Range:UltraMOV 25S Series; Clamping Voltage Vc Max:1.475kV; Varistor Case Style:Radial Leaded; Varistor Type:Metal Oxide V

## Specifications

| Parameter | Value |
|---|---|
| Svhc | To Be Advised |
| Product Range | UltraMOV 25S Series |
| Varistor Type | Metal Oxide Varistor (MOV) |
| Voltage Rating Vac | 550V |
| Voltage Rating Vdc | 745V |
| Varistor Case Style | Radial Leaded |
| Clamping Voltage Vc Max | 1.475kV |
| Peak Energy (10/1000Us) | - |
| Operating Temperature Max | 85°C |
| Operating Temperature Min | -40°C |
| Peak Surge Current @ 8/20Μs | 22kA |
| Automotive Qualification Standard | - |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:2786544/)

**Metal-Oxide Varistors** (MOVs) Radial Lead Varistors  >  UltraMOV[TM] 25S Varistor Series 

## UltraMOV®  25S Varistor Series 

## ~~HF |__|~~ **Ro** ~~**HS** @ cSALus A~~ 

## ~~**Description**~~ 

The UltraMOV[® ] 25S Varistor Series is designed for applications requiring high peak surge current ratings and high energy absorption capability. UltraMOV® 25S varistors are primarily intended for use in AC Line Voltage applications such as Surge Protective Devices (SPD), Uninterruptable Power Supplies (UPS), AC Power Taps, AC Power Meters, or other products that require voltage clamping of high transient surge currents from sources such as lightning, inductive load switching, or capacitor bank switching. 

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Agency Approvals<br>a<br>Agency Agency Approval Agency File Number<br>Wks UL1449 E320116<br>IEC 61051-1, IEC61051-2, IEC<br>60950-1 (Annex Q) J 50479672<br>db IEC 62368-1(Annex G)<br>**----- End of picture text -----**<br>


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Additional Information<br>Datasheet Resources<br>**----- End of picture text -----**<br>


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Samples<br>**----- End of picture text -----**<br>


UltraMOV® 25S has compact square disc which is made with radial wire leads. UltraMOV[® ] 25S varistors are manufactured with recognized epoxy encapsulation and are rated for ambient temperatures up to 85°C with no derating. This UltraMOV® 25S Series is 

LASER-branded and is supplied in bulk packaging. 

## ~~**Features** Lo~~ 

- Lead–free, Halogen•  125°C operating Free and RoHS temperature-phenolic compliant coating option 

- High peak surge •  10kA Nominal current rating Discharge Current (In) (ITM) 22kA, single as required by UL 1449 8/20 _µ_ s pulse. 

- 20kV/10kA (1.2/50 μs, 

- • Maximum continuous 8/20 μs) combination operating voltage pulse as required (MCOV): 115Vac by Annex G of - 750Vac IEC 62368-1 

## ~~**Absolute Maximum Ratings** LO~~ 

• For ratings of individual members of a series, see Device Ratings and Specifications chart ~~a~~ **Continuous UltraMOV[® ] 25S Varistor Series Units Steady State Applied Voltage:** AC Voltage Range (VM(AC)RMS) 115 to 750 V DC Volta ~~OO~~ ge Range (VM(DC)) 150 to 970 V **Transients:** ~~ee~~ Peak Pulse Current (ITM) 8x20µs Current Wave Single Pulse ~~po~~ 22,000 A Single-Pulse Energy Capability (WTM) 2ms Current Wave ~~Po~~ 230 to 890 J Operating Ambient Temperature Range (TA) ~~po~~ -40 to +85 ºC Storage Temperature Range (TSTG) ~~po~~ -40 to +125 ºC Temperature Coefficient (a[V] ) of Clamping Voltage (VC) at Specified Test Current ~~Po~~ <0.01 %/C Hi-Pot Encapsulation (COATING Isolation Voltage Capability) 2500 V Dielectic Withstand DC for 1 min per MIL–STD–202,  Method 301 ~~PO~~ Insulation Resistance of the Epoxy Coating ~~pT~~ 1000 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. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/23/20 

**Metal-Oxide Varistors** (MOVs) Radial Lead Varistors  >  UltraMOV[TM] 25S Varistor Series 

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## ~~**Ratings & Specifcations**~~ 

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Maximum Rating (85°C) Specifications (25°C)<br>Continuous Transient UL 1449<br>Varistor Voltage  Maximum Clamping  Typical Capaci-<br>Part Number Branding AC Volts DC Volts Energy 2ms Peak Surge 8 x 20µsCurrent  Test Currentat 1mA DC  Voltage at 100A, 8 x 20µs ProtectionVoltageRating f = 1MHztance<br>VM(AC)RMS VM(DC) 1 x PulseWTM  1 x PulseITM VMinNOM VMaxNOM  VC VPR C<br>(V) (V) (J) (A) (V) (V) (pF)<br>V25S115P P25S115 115 150 230 22000 162  198  295 400 4500<br>V25S130P P25S130 130 170 255 22000 184.5  225.5  335 500 3900<br>V25S140P P25S140 140 180 285 22000 198  242  355 500 3500<br>V25S150P P25S150 150 200 300 22000 216  264  390 500 3200<br>V25S175P P25S175 175 225 315 22000 243  297  450 600 2550<br>V25S230P P25S230 230 300 400 22000 324  396  585 700 1900<br>V25S250P P25S250 250 320 435 22000 351  429  640 800 1750<br>V25S275P P25S275 275 350 470 22000 387  473  700 900 1610<br>V25S300P P25S300 300 385 500 22000 423  517  765 1000 1450<br>V25S320P P25S320 320 420 540 22000 459  561  825 1000 1350<br>V25S385P P25S385 385 505 630 22000 558  682  1010 1200 1080<br>V25S420P P25S420 420 560 655 22000 612  748  1100 1500 1000<br>V25S440P P25S440 440 585 675 22000 643.5  786.5  1160 n/a 900<br>V25S460P P25S460 460 615 690 22000 675  825  1220 n/a 870<br>V25S510P P25S510 510 670 700 22000 738  902  1335 n/a 820<br>V25S550P P25S550 550 745 765 22000 819  1001  1475 n/a 750<br>V25S625P P25S625 625 825 800 22000 900  1100  1625 n/a 660<br>V25S750P P25S750 750 970 890 22000 1080  1320  1950 n/a 550<br>Note: Average powder dissipation of transients should not exceed 1.5 watts.<br>Transient V-I Characteristics Curves<br>Peak Current, Energy and Power Derating Curve Peak Pulse Current Test Waveform for Clamping Voltage<br>100<br>100<br>80<br>60 50<br>40<br>20<br>0 t<br>TIM E<br>0 Figure 2 O 1 t1 t2<br>55 50 60 70 80 90 100 110 120 130<br>Figure 1 AMBIENT TEMPERATURE (ºC) 01 = Virtual Origin of Wave<br>T  = Time from 10% to 90% of Peak<br>T1 = Rise Time = 1.25 x T<br>For applications exceeding 85ºC ambient temperature, the  T2 = Decay Time<br>P E RCE NT O F RA TE D V A LUE PERCENT OF PEAK VALUE<br>**----- End of picture text -----**<br>


For applications exceeding 85ºC ambient temperature, the peak surge current and energy ratings must be reduced as shown above. 

**Example** - For an 8/20 _µ_ s Current Waveform: 8 _µ_ s = T1 = Rise Time 20 _µ_ s = T2 = Decay Time 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/23/20 

**Metal-Oxide Varistors** (MOVs) Radial Lead Varistors  >  UltraMOV[TM] 25S Varistor Series 

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Transient V-I Characteristic Curve<br>10000<br>750<br>625<br>550<br>510<br>460<br>440<br>420<br>385<br>1000<br>320<br>300<br>275<br>250<br>150 175 230<br>140<br>130<br>115<br>100<br>0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 10000 100000<br>Figure 3 Peak C u rren t (A)<br>Maxim u m  Peak Voltage (V)<br>**----- End of picture text -----**<br>


## ~~**Pulse Rating Curve**~~ 

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100000<br>1<br>2<br>10000  15<br>10 [2]<br>103<br>1000<br>104<br>10 [5]<br>10 [6]<br>100  ∞<br>10<br>1<br>10 100 1000 10000<br>Figure 4<br>Impulse Duration (µs)<br>Peak Current (A)<br>**----- End of picture text -----**<br>


**Note:** Repetitive surge capability is qualified and tested based on 8/20us current waveform (not combination waveform) and UL1449 40.7.3 (Edition 4) test condition. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/23/20 

**Metal-Oxide Varistors** (MOVs) Radial Lead Varistors  >  UltraMOV[TM] 25S Varistor Series 

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## ~~**Wave Solder Profle**~~ 

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Non Lead–free Wave Solder Profle<br>300<br>Maximum Wave 240C<br>250<br>200<br>150<br>100<br>50<br>0<br>0 0.5 1 1.5 2 2.5 3 3.5 4<br>Figure 5 TIME(MINUTES)<br>Physical Specifcations<br>Lead Material Copper Clad Steel Wire<br>Soldering Characteristics Solderability per MIL–STD–202, Method 208<br>Cured, flame retardant epoxy polymer meets<br>Insulating Material UL94V–0 requirements<br>Marked with LF, voltage, UL/CSA Logos, and<br>Device Labeling date code<br>TEMPERATURE (ºC)<br>**----- End of picture text -----**<br>


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Lead–free Wave Solder Profle<br>**----- End of picture text -----**<br>


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300<br>Maximum Wave 260C<br>250<br>200<br>150<br>100<br>50<br>0<br>0 0.5 1 1.5 2 2.5 3 3.5 4<br>Figure 6 TIME(MINUTES)<br>Environmental Specifcations<br>Operating Temperature -40°C to +85°C<br>Storage Temperature -40°C to +125°C<br>+85°C, 85% RH,  1000 hours<br>Humidity Aging +/-10% typical voltage change<br>+85°C to -40°C 5 times<br>Thermal Shock<br>+/-10% typical voltage change<br>Solvent Resistance MIL–STD–202, Method 215<br>Moisture Sensitivity Level 1, J-STD-020<br>TEMPERATURE (ºC)<br>**----- End of picture text -----**<br>


## ~~**UltraMOV[® ] 25S Varistor Series for High-Temperature Operating Conditions:**~~ 

Phenolic coated devices are available with improved maximum operating temperature 125ºC. These devices also have improved temperature cycling capability. Ratings and specifications are per standard series except Hi–Pot Encapsulation (Isolation Voltage Capability) = 500V. 

**To order:** add 'X1347' to part number (e.g. V25S150PX1347). These devices are NOT UL, CSA, CECC or VDE certified.Contact factory for further details. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/23/20 

Radial Lead Varistors  >  UltraMOV[TM] 25S Varistor Series 

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## **Metal-Oxide Varistors** (MOVs) 

## ~~**Product Dimensions (mm)**~~ 

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**----- Start of picture text -----**<br>
 D A max b min b max D max e min e max e1 min e1 max E max L min<br>V25S115P 1.5 2.7 5.7<br>V25S130P 1.6 2.9 5.9<br>V25S140P 1.7 3.0 6.0<br>V25S150P 1.8 3.1 6.1<br>V25S175P 1.9 3.3 6.3<br>V25S230P 2.0 3.4 6.4<br>V25S250P 2.1 3.5 6.5<br>V25S275P 2.3 3.7 6.7<br>V25S300P 2.4 3.9 6.9<br>30.5 0.95 1.05 26.5 11.7 13.7 25.4<br>V25S320P 2.6 4.1 7.1<br>V25S385P 3.0 4.7 7.7<br>V25S420P 3.3 5.0 8.0<br>b V25S440P 3.4 5.2 8.2<br>V25S460P 3.6 5.4 8.4<br>e V25S510P 1.6 3.4 8.7<br>V25S550P 1.9 3.9 9.2<br>V25S625P 2.3 4.3 9.6<br>V25S750P 3.1 5.4 10.7<br>A<br>L<br>e1 E<br>**----- End of picture text -----**<br>


## ~~**Notes**~~ 

1. Additional optional lead form, packaging and lead spacing requirements are subject to availability and to minimum order requirements. Please contact factory for details. 

2. Nickel Barrier Wire option (Suffix 'X2855')Standard parts use Tin-Coated Copper wire. Nickel Barrier Coated Wire is available as an option. This is Copper Wire with a flashing of Nickel, followed by a top coat of Tin. To order please add suffix 'X2855' to end of standard part number. Contact factory for more details if required. 

**Disclaimer Notice** - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications.  Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/23/20 



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---

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