Varistor Metal Oxide Varistor Products Page 78 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 > SM20 Series Description The Littelfuse 20mm SMD Series is a surface-mount metal oxide varistor device, for use in applications requiring hi-energy / transient current capability. The AC rated parts are designed to operate continuously across AC power lines. The DC rated parts are suitable for Automotive applications. The series comprises a Nylon molded package with folded tin plated metal leads for soldering to board. The SMD Series is based on radial 20mm internal varistor element with similar characteristics to the Littelfuse LA / ZA series of varistors. Features DC Voltage Rating 26 - 420VDC AC Voltage Rating 20Vac - 320AC No De-Rating up to 85C ambient Lead-Free, Halogen- Free and RoHS Compliant Low voltage devices specified for automotive load dump energy Available in "waffle" tray packaging Agency Approvals Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart Continuous SM20 Series Units Steady State Applied Voltage: AC Voltage Range (V M(AC)RMS ) 20 to 320 V DC Voltage Range (V M(DC) ) 26 to 420 V Transients: Peak Pulse Current (I TM ) 8/20 s Current Wave, Single Pulse up to 6500 A Single Pulse Energy Capability (W TM ) 10/1000 s Current Wave 165 J Load Dump Energy Capability (td>=30ms) 160 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. SM20 Varistor Series RoHS Agency Agency Approval Agency File Number UL1449 E320116 Additional Information Datasheet Samples Resources

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