Varistor Metal Oxide Varistor Products Page 76 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 For applications exceeding 85C ambient temperature, the peak surge current and energy ratings must be reduced as shown below Peak Current, Energy and Power Derating Curve 0 1 = Virtual Origin of Wave T = Time from 10% to 90% of Peak T 1 = Rise Time = 1.25 x T T 2 = Decay Time Example - For an 8/20 s Current Waveform: 8 s = T 1 = Rise Time 20 s = T 2 = Decay Time PERCENT OF PEAK VALUE Test 0 50 100 TIM E t 1 t 2 t O 1 Pulse Rating Curves 1 10 100 1000 10000 10 100 1000 10000 Impulse Duration (s) Surge Current (A) 1 2 10 2 10 3 10 4 10 5 10 6 NOTE: If pulse ratings are exceeded, a shift of V N(DC) (at specified current) of more than 10% could result. This type of shift, which normally results in a decrease of V N(DC) , may result in the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide ample protection. V-I Limit Curves 0 500 1000 1500 2000 0.001 0.01 0.1 1 10 100 1000 Current(A) Voltage(V) V510SM7 V480SM7 V460SM7 V420SM7 V385SM7 V320SM7 V300SM7 V250SM7 V230SM7 V210SM7 V190SM7 V175SM7 V150SM7 V140SM7 V130SM7 V115SM7 100 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 150 AMBIENT TEMPERATURE ( o C) PERCENT OF RATED VALUE Peak Pulse Current Test Waveform for Clamping Voltage Operating Ambient Temperature Range (T A ) -40C to +85C Storage Temperature Range(T STG ) -55C to 125C Solvent Resistance MIL STD 202, Method 215 Moisture Sensitivity Level 1, J-STD-020 (V115SM7 to V510SM7) Lead Material Folded Tin Plated Metal Leads Soldering Characteristics J-STD-002 Coating Molded Plastic Meets UL94 V-0 Requirement Physical Specifications Environmental Specifications 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.

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