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 from the main power which ensures indicator circuit safety and simplifies the customers circuit design. Agency Approvals Agency Agency Approval Agency File Number UL1449 E320116 Features • Maximum single surge capability 20 kA, 8/20 waveshape. • Recognized to UL 1449. • Lead-Free and RoHS compliant. •Nominal Discharge Current Value: 10kA. Additional Information • Integrated micro-switch for indication circuitry/design. • Intermediate current rating: 50A/150A. Datasheet Resources Samples • -45°C to +75°C operating 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. Continous: Steady State Applied Voltage: DC Voltage Range (VM(DC)) AC Voltage Range (VM(AC)RMS) Transient: Non-Repetitive Surge Current, 8/20µs Waveform (ITM) Non-Repetitive Energy Capability, 2ms Waveform (WTM) SMOV25S Varistor Series Units 150 to 970 115 to 750 V V 20,000 A 170 to 670 J Operating Ambient Temperature Range (TA) -45 to +75 °C Storage Temperature Range (TSTG) -45 to +85 °C Hi-Pot Encapsulation (Isolation Voltage Capability) 2500 V Isolation Voltage Capability (when the thermal disconnect opens) 1500 V >1,000 MΩ Housing Insulation Resistance 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. © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/04/15 Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series Device Ratings & Specifications Maximum Rating (75°C) Continuous 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 Specifications (25 °C) Transient AC Volts DC Volts Energy 2ms VM (AC) VM(DC) WTM (V) (V) 115 Peak Surge Current 8/20μs Nominal Discharge Current (In) (J) ITM 1 × Pulse (A) (A) 150 170 20000 10000 130 170 190 20000 150 200 220 175 225 250 Varistor Voltage at 1mA Test Current Maximum Clamping Voltage 8/20μs Typical Capacitance f = 1MHz VN(DC) Max (V) Vc IPK C (V) (A) (pF) 162 198 295 100 3200 10000 184.5 225.5 335 100 2800 20000 10000 216 264 390 100 2300 250 20000 10000 243 297 450 100 1900 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 In VN(DC) Min 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. © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/04/15 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 Abnormal Overvoltage Test: For applications exceeding 75ºC ambient temperature, the peak surge current and energy ratings must be reduced as shown below. 10 PERCENT OF RATED VALUE 100 Current (A) Typical 10 A 1 5A 2.5 A 0.5 A 80 60 40 20 0 - 45 50 60 80 70 90 100 110 120 130 AMBIENT TEMPERATURE (ºC) 0.1 1 Figure 1 10 100 Figure 2 Time (secs) Transient V–I Characteristic Curves 10000 750 Maximum Peak Voltage (V) 625 420 385 440 550 510 460 1000 275 115 130 140 150 175 230 300 320 250 100 10µA 100µA Figure 3 © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/04/15 1mA 10mA 100mA 1A Peak Current 10A 100A 1000A 10000A 100000A Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series Pulse Rating Curve 100000 1 2 10000 15 10 2 10 1000 3 4 10 5 10 10 100 6 ∞ 10 1 Figure 4 10 100 1000 10000 Impulse Duration (secs) Wave Solder Profile Because the SMOV®25S Varistors contain a thermal protection device, care must be taken when soldering the devices into place. Two soldering methods are possible. Firstly, hand soldering: It is recommended to heat–sink the leads of the device. Secondly, wave–soldering: It is critically important that all preheat stage and the solder bath temperatures are rigidly controlled. Lead–free Profile Non Lead–free Profile 300 300 250 TEMPERATURE (ºC) 250 TEMPERATURE (ºC) Maximum Wave 260C Maximum Wave 240C 200 150 100 200 150 100 50 50 0 0 0 0.5 1 Figure 5 1.5 2 2.5 3 3.5 TIME(MINUTES) Physical Specifications 4 0 0.5 1 Figure 6 1.5 2 2.5 3 3.5 Environmental Specifications Lead Material Tin–plated Operating/Storage Temp. -45°C to +75°C Soldering Characteristics Solderability per MIL-STD-202, Method 208 Passive Aging +75°C, 1000 hours -/+10% typical voltage change Humidity Aging Insulating Material Cured, flame retardant epoxy polymer meets UL94V-0 requirements +75°C, 85%R.H., 1000 hours -/+10% typical voltage change Thermal Shock +75°C to -40°C 5 times -/+10% typical voltage change Solvent Resistance MIL-STD-202, Method 215 Moisture Sensitivity Level 1, J-STD-020 Device Labeling Marked with LF, voltage, UL logos, and date code 4 TIME(MINUTES) © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/04/15 Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series Product Dimensions Lead Configuration 31Max 16.5Max SMOVXXS321MP SMOV25S321MP 1148 LF9 1.3±0.3 13.4±0.2 0.3±0.2 S2 S3 S1 3.5±0.2 P1 P2 MOV S2 S1 S3 ON S1 P2 P2 Primary side S2 OFF (Normal open) (Normal Close) P1 S3 Common S2 S3 S1 P1 P1 P2 4.0±1.2 0.5±0.2 P2 MOV S2 S3 S1 2.5±0.3 2±0.3 Thermal disconnect 1.4±0.21209 3*0.6±0.2 S1 ON (Normal Close) S3 Common SMOVXXS321MP 10Min 9Min 8.5±0.5 3.5±0.2 Thermal disconnect 1209 Galvanic isolation P1 S2 OFF (Normal open) P2 Primary side Secondary side Secondary side Galvanic isolation P1 Application Example Thermal disconnect S1 ON Galvanic isolation P1 Thermal disconnect R LED Primary side Note: EXAMPLE ONLY - Connection to S2-S3 and S1-S3 depends on customer indication circuit and can vary. P2 Secondary side MOV S2 OFF Note: EXAMPLE ONLY - Connection to S2-S3 and S1-S3 depends on customer indication circuit and can vary. P2 Secondary side Switch Specification SMOV Switch Voltage DC Current (Amps) Switch 12V 0.1A © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/04/15 Contact Resistance Max. Insulation Resistance Min. 70mΩ LED S2 OFF S3 Common Primary side R S3 Common * LED is off when the product is normal(S1,S3 connected), MOV LED is on when the product disconect opens(switch change status; S2,S3 connected as shown by dotted line ). S1 ON * LED is off when the product is normal(S1,S3 connected), LED is on when the product disconect opens(switch change status; S2,S3 connected as shown by dotted line ). To Protected Circuit 36Max LF 9 Galvanic isolation P1 LF9 100MΩ Dialectric Strength 0.5mA/Minute 500VAC Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®25S Varistor Series Part Numbering System SMOV 25 S 321 N P Xxxxx DEVICE FAMILY Littelfuse Thermally Self Protected MOV DISC SIZE (mm) 25mm CERAMIC SHAPE S: Square VM(AC)RMS 115V to 750V Part Marking System UL Recognized Component Mark Production Site Code Littelfuse Mark Part Number Production Date Dode (Year and Week) LF9 SMOV25S321MP 1148 M:With Isolated Monitored Switch N: Non Isolated Monitored Switch Design P: Lead-Free and RoHS compliant Option Codes © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/04/15