Varistor Metal Oxide Varistor Products Page 73 Varistor Metal-Oxide Varistor Products

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17 Metal-Oxide Varistors (MOVs) Surface Mount Varistors > SM7 Series RoHS Description The Littelfuse SM7 is a plastic-encapsulated surface mount MOV in a PPS material molded package with tin-plated terminal which is fully qualified in lead free soldering and available for both reflow and wave soldering process. SM7 is constructed with 7mm varistor element disc. Its maximum operating ambient temperature is 85C with peak pulse current of 1200A. Features Electrical equivalent to leaded types LA/ZA series AC Voltage Rating 50 to 510VAC rms No De-Rating up to 85C ambient Good solderability Available in tape and reel Application of AC power meters Lead free and RoHS compliant Agency Approvals Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart Continuous SM7 Series Units Steady State Applied Voltage: AC Voltage Range (V M(AC)RMS ) 50 to 510 V DC Voltage Range (V M(DC) ) 68 to 675 V Transients: Peak Pulse Current (I TM ) For 8/20 s Current Wave (See Figure 2) 1200 A Single Pulse Energy Range For 10/1000 s Current Wave (W TM ) 10 to 40 J Operating Ambient Temperature Range (T A ) -40 to +85 O C Storage Temperature Range (T STG ) -55 to +125 O C Temperature Coefficient (a V ) of Clamping Voltage (V C ) at Specified Test Current <0.01 %/ O C Hi-Pot Encapsulation (COATING Isolation Voltage Capability) (Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301) 2500 V COATING Insulation Resistance 1000 M 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. SM7 Varistor Series Agency Agency Approval Agency File Number UL1449 E320116 Additional Information Datasheet Samples Resources

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