Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series SMOV25S® Varistor Series RoHS Description The Littelfuse SMOV®25S thermally protected varistor is a self-protected 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. 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 Agency Approvals from the main power which ensures indicator circuit safety and simplifies the customers circuit design. Agency Agency Approval Agency File Number Features UL1449 E320116 • Maximum single • Recognized to UL 1449. surge capability 20 kA, • Lead-Free and RoHS 8/20 waveshape. compliant. Additional Information • Nominal Discharge • Integrated micro-switch for Current Value: 10kA. indication circuitry/design. • Intermediate current rating: 50A/150A. • -45°C to +75°C operating Datasheet Resources Samples temperature. 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 Varistor Series Units 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 (I ) 20,000 A TM Non-Repetitive Energy Capability, 2ms Waveform (W ) 170 to 670 J TM Operating Ambient Temperature Range (T ) -45 to +75 °C A 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. © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series Device Ratings & Specifications Maximum Rating (75°C) Specifications (25 °C) Continuous Transient Varistor Maximum Typical Voltage at Clamping NuPmarbt e r VAoClts VDoClts En2emrgsy PeCaukr Sreunrtg e DNisocmhainrgale 1CmuArr Teenstt V8o/2lt0aμgse Caf p=a 1cMitaHnzce 8/20μs Current (In) I V V V V W TM In N(DC) N(DC) Vc I C M (AC) M(DC) TM 1 × Pulse Min Max PK (V) (V) (J) (A) (A) (V) (V) (A) (pF) SMOV25S111MP 115 150 170 20000 10000 162 198 295 100 3200 SMOV25S111NP SMOV25S131MP 130 170 190 20000 10000 184.5 225.5 335 100 2800 SMOV25S131NP SMOV25S151MP 150 200 220 20000 10000 216 264 390 100 2300 SMOV25S151NP SMOV25S181MP 175 225 250 20000 10000 243 297 450 100 1900 SMOV25S181NP SMOV25S251MP 250 320 330 20000 10000 351 429 640 100 1400 SMOV25S251NP SMOV25S271MP 275 350 350 20000 10000 387 473 700 100 1250 SMOV25S271NP SMOV25S301MP 300 385 370 20000 10000 423 517 765 100 1150 SMOV25S301NP SMOV25S321MP 320 420 390 20000 10000 459 561 825 100 1080 SMOV25S321NP SMOV25S421MP 420 560 460 20000 10000 612 748 1100 100 820 SMOV25S421NP SMOV25S461MP 460 615 490 20000 10000 675 825 1220 100 750 SMOV25S461NP SMOV25S511MP 510 670 520 20000 10000 738 902 1335 100 680 SMOV25S511NP SMOV25S551MP 550 745 550 20000 10000 819 1001 1475 100 630 SMOV25S551NP SMOV25S621MP 620 800 600 20000 10000 900 1100 1625 100 550 SMOV25S621NP SMOV25S751MP 750 970 670 20000 10000 1080 1320 1950 100 460 SMOV25S751NP 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. © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series Thermal Characteristics Peak Current & Energy Derating Curve Typical time to open circuit under UL 1449 Limited Current For applications exceeding 75ºC ambient temperature, the Abnormal Overvoltage Test: peak surge current and energy ratings must be reduced as shown below. 10 100 E U80 L A Typical D V E60 A) 10 A AT nt ( 1 5 A F R Curre 20..55 AA ENT O40 C R20 E P 0 -45 50 60 70 80 90 100 110 120 130 0.1 AMBIENT TEMPERATURE (ºC) 1 10 100 Figure 1 Time (secs) Figure 2 Transient V–I Characteristic Curves 10000 750 625 550 510 V)          385 420 440 460 e ( g a olt V k 1000 a e P m u m xi a M        320 300 275 250 150 175 230 140 130 115 100 10µA 100µA 1mA 10mA 100mA 1A 10A 100A 1000A 10000A 100000A Figure 3       Peak Current         © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series Pulse Rating Curve 100000 1 2 10000 15 102 103 1000 104 105 106 100 ∞ 10 1 Figure 4 10  100 1000 10000 Impulse Duration (secs) Wave Solder Profile Because the SMOV®25S Varistors contain a thermal protection recommended to heat–sink the leads of the device. Secondly, device, care must be taken when soldering the devices into place. wave–soldering: It is critically important that all preheat stage and Two soldering methods are possible. Firstly, hand soldering: It is the solder bath temperatures are rigidly controlled. Non Lead–free Profile Lead–free Profile 300 300 Maximum Wave 260C Maximum Wave 240C 250 250 C) C) E (º 200 E (º 200 R R U U T T A 150 A 150 R R E E P P M 100 M 100 E E T T 50 50 0 0 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 1.5 2 2.5 3 3.5 4 Figure 5 TIME(MINUTES) Figure 6 TIME(MINUTES) Physical Specifications Environmental Specifications Lead Material Tin–plated Operating/Storage Temp. -45°C to +75°C +75°C, 1000 hours Soldering Solderability per MIL-STD-202, Passive Aging -/+10% typical voltage change Characteristics Method 208 +75°C, 85%R.H., 1000 hours Humidity Aging Cured, flame retardant epoxy polymer -/+10% typical voltage change Insulating Material meets UL94V-0 requirements +75°C to -40°C 5 times Thermal Shock -/+10% typical voltage change Marked with LF, voltage, UL logos, and Device Labeling date code Solvent Resistance MIL-STD-202, Method 215 Moisture Sensitivity Level 1, J-STD-020 © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series Product Dimensions Lead Configuration 31Max 16.5Max Galvanic isolation P1 LF9 LF9 x SMOVXXS321MP Ma SMOV25S321MP 6 1209 Thermal S1 ON 3 1148 Galvanic isolation disconnect (Normal Close) P1 LF9 S3 Common SMOVXXS321MP Min 0Min 1.4±0.212091.3±0.3 Therm2a±l 0.3 S2 SS13 OSN1 MOV S2 OFF 9 1 disconnect P2 (Normal CloPse1) (Normal open) 0.3±0.2 3.5±0.2 3*0.6±0.2 0.5±0.2 3.5±0.2 S2 SS33 CS1ommon P1 P2 13.4±0.2 MOV P2 Primary side Secondary side 0.5 S2 S3 S1 S2 OFF ± P2 P1 (Normal open) 5 8. S2 S3 S1 P1 P2 3 P2 Primary side Secondary side 0. 4.0±1.2 ± 5 2. Galvanic isolation P1 * LED is off when the product is normal(S1,S3 connected), LED is on when the product disconect opens(switch change Application Example status; S2,S3 connected as shown by dotted line ). uit Thermal c disconnect S1 ON R LED Cir d Galvanic isolation e S3 Common ct P1 e * LED is off when the product is normal(SM1,OS3V connected), ot LED is on when the product disconect opens(switch change r Thermal status; S2,S3 connected as shown by dotted line ). S2cuit OFNoFte: EXAMPLE ONLY - Connection to S2-S3 and S1-S3 To P S1 ON rdepends on customer indication circuit and can vary. disconnect R LEDP2 Ci Primary side Secondad ry side e S3 Common ct e MOV ot r P S2 OFF Note: EXAMPLE ONLY - Connection to S2-S3 and S1-S3 To depends on customer indication circuit and can vary. P2 Primary side Secondary side Switch Specification Dialectric Strength SMOV Switch Voltage DC Current (Amps) Contact Resistance Max. Insulation Resistance Min. 0.5mA/Minute Switch 12V 0.1A 70mΩ 100MΩ 500VAC © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series Part Numbering System Part Marking System SMOV 25 S 321 N P Xxxxx UL Recognized Component Mark DEVICE FAMILY Littelfuse Thermally Self Protected MOV Production Site Code DISC SIZE (mm) Littelfuse Mark LF9 25mm Part Number SMOV25S321MP CERAMIC SHAPE Production Date Dode S: Square (Year and Week) 1148 VM(AC)RMS 115V to 750V M:With Isolated Monitored Switch N: Non Isolated Monitored Switch Design P: Lead-Free and RoHS compliant Option Codes 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. © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: L ittelfuse: SMOV25S111MP SMOV25S131MP SMOV25S151MP SMOV25S181MP SMOV25S251MP SMOV25S271MP SMOV25S301MP SMOV25S321MP SMOV25S421MP SMOV25S461MP SMOV25S511MP SMOV25S551MP SMOV25S751MP SMOV25S251NP SMOV25S181NP SMOV25S511NP SMOV25S111NP SMOV25S461NP SMOV25S621NP SMOV25S321NP SMOV25S421NP SMOV25S621MP SMOV25S551NP SMOV25S131NP SMOV25S151NP SMOV25S301NP SMOV25S271NP SMOV25S751NP