Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®34S Varistor Series SMOV®34S Varistor Series RoHS Description The Littelfuse SMOV®34S thermally protected varistor is a self-protected device. It consists of a 34mm 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 Additional Information Datasheet Resources Features • Maximum single surge capability 40 kA, 8/20 waveshape. • Nominal Discharge Current Value: 20kA. • Intermediate current rating: 50A/150A. • -45°C to +75°C operating temperature. • Recognized to UL 1449. • Lead-Free and RoHS compliant. • Integrated micro-switch for indication circuitry/design. Samples Applications • SPD applications • AC/DC distribution • T/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) SMOV34S S Varistor Series Units 150 to 970 115 to 750 V V 40,000 A 280 to 1200 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: 03/02/15 Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®34S Varistor Series Device Ratings & Specifications Maximum Rating (75°C) Continuous Part Number SMOV34S131MP SMOV34S131NP SMOV34S151MP SMOV34S151NP SMOV34S181MP SMOV34S181NP SMOV34S251MP SMOV34S251NP SMOV34S271MP SMOV34S271NP SMOV34S301MP SMOV34S301NP SMOV34S321MP SMOV34S321NP SMOV34S421MP SMOV34S421NP SMOV34S461MP SMOV34S461NP SMOV34S511MP SMOV34S511NP SMOV34S551MP SMOV34S551NP SMOV34S621MP SMOV34S621NP SMOV34S751MP SMOV34S751NP Varistor Voltage at 1mA Test Current DC Volts Energy 2ms VM(DC) WTM (V) (V) (J) 115 150 280 40000 20000 162 130 175 310 40000 20000 150 200 360 40000 180 240 400 250 320 275 AC Volts Nominal Discharge Current VN(DC) Max VN(DC) Min Maximum Clamping Voltage 8/20μs Typical Capacitance f = 1MHz Vc IPK C (V) (A) (pF) 198 305 200 11500 184.5 225.5 345 200 10000 20000 216 264 405 200 8000 40000 20000 256 312 488 200 6800 490 40000 20000 351 429 650 200 5000 350 550 40000 20000 387 473 730 200 4500 300 385 590 40000 20000 432 528 780 200 4050 320 420 640 40000 20000 459 561 830 200 3800 420 560 910 40000 20000 612 748 1130 200 3000 460 610 960 40000 10000 643.5 786.5 1188 200 2800 510 675 960 40000 10000 738 902 1350 200 2500 550 700 965 40000 10000 770 939 1415 200 2250 620 800 1010 40000 10000 900 1100 1625 200 2100 750 970 1200 40000 10000 1080 1320 2000 200 1800 RMS SMOV34S111NP Transient Peak Surge Current 8/20μs ITM 1 × Pulse (A) VM (AC) SMOV34S111MP Specifications (25 °C) In (A) (V) Average power dissipation of transients should not exceed 2.0 watts Same ratings and specifications apply to Non Isolated Monitored Switch alternative design. Replace "M" with "N" in the part number. e.g.: SMOV34S111NP. Refer to Part Number System at the end of this document. © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/02/15 Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®34S Varistor Series Thermal Characteristics Peak Current & Energy Derating Curve 10 PERCENT OF RATED VALUE 100 Current (A) Typical 10 A 1 5A 2.5 A 0.5 A 60 40 20 0 - 45 0 .1 Figure 1 80 1 10 50 60 Figure 2 10 0 Time (secs) 70 80 90 100 110 120 130 AMBIENT TEMPERATURE (ºC) For applications exceeding 75ºC ambient temperature, the peak surge current and energy ratings must be reduced as shown. Pulse Rating Curve 50,000 20,000 SURGE CURRENT (A) 10,000 2 15 5,000 10 2 2,000 10 3 1,000 500 1 10 5 10 6 10 4 200 100 50 20 10 Figure 3 INDEFINITE 20 100 1,000 IMPULSE DURATION ( µs) Transient V-I Characteristic Curve 10000 Maximum Clamping Voltage TA = -45 C to 75C V751 Voltage VOLTS V661 V511 V551 V681 V571 1000 V481 V141 V131 V111 V441 V151 V421 Figure 4 100 1mA 10mA © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/02/15 100mA Current - AMPS 1A V391 10A 100A 1000A V351 V331 V321 V301 V271 10000A V251 V201 V181 100000A 10,000 Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®34S Varistor Series Wave Solder Profile Because the SMOV®34S 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 1.5 2 2.5 3 3.5 TIME(MINUTES) Figure 5 Physical Specifications 4 0 0.5 1 1.5 2 2.5 3 3.5 4 TIME(MINUTES) Figure 6 Environmental Specifications Operating/Storage Temperature -45°C to +75°C/ -45°C to +85°C Humidity Aging Cured, flame retardant epoxy polymer meets UL94V–0 requirements. +75°C, 85% RH, 1000 hours +/-10% voltage Thermal Shock Marked with LF, part identifier, and date code +75°C to -40°C 5 times +/-10% voltage Solvent Resistance MIL–STD–202, Method 215 Moisture Sensitivity Level 1, J-STD-020 Lead Material Tin–plated Copper Soldering Characteristics Solderability per MIL–STD–202, Method 208 Insulating Material Device Labeling Part Numbering System SMOV 34 S 321 N P Xxxxx DEVICE FAMILY Littelfuse Thermally Self Protected MOV DISC SIZE (mm) 34mm 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 SMOV34S321MP 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: 03/02/15 Metal-Oxide Varistors (MOVs) Thermally Protected Varistors > SMOV®34S Varistor Series Device Dimension Lead Configuration 41Max 20Max 44.5Max LF 9 Galvanic isolation P1 LF9 SMOVXXS321MP SMOV34S321MP LF9 1148 Galvanic isolation 1209 P1 Thermal disconnect S1 ON (Normal Close) 10Min 10Min SMOVXXS321MP 1.4±0.2 3*0.6±0.2 1209 1.2±0.3 6.0±0.2 P2 P1 P2 S2 S3 S1 P1 2.5±0.3 P2 P2 Primary side MOV S2 OFF (Normal open) P1 S3 Common S2 S3 S1 MOV S2 S3 S1 21.5±0.2 P2 0.5±0.2 0.3±0.2 S1 ON S2 (Normal S3 S1 Close) S2 OFF (Normal open) P1 P2 Primary side Secondary side Secondary side 6.5±2.2 Galvanic isolation P1 Application Example Thermal disconnect Galvanic isolation P1 Thermal disconnect 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 MOVline ). S1 ON S3 Common R Note: EXAMPLE ONLY - Connection to S2-S3 and S1-S3 depends on customer indication circuit and can vary. P2 Secondary side 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: 03/02/15 Contact Resistance Max. Insulation Resistance Min. 70mΩ LED S3 Common MOV Primary side R S2 OFF LED Primary side * 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 11.0±0.5 6.0±0.2 S3 Common Thermal disconnect 3.6±0.3 100MΩ Dialectric Strength 0.5mA/Minute 500VAC