V275SM7

Varistor Products Surface Mount Varistors > SM7 Series RoHS SM7 Varistor Series Description The Littelfuse SM7 Series is a plastic-encapsulated surface-mount metal oxide varistor (MOV) transient voltage surge suppressor that is designed to be operated continuously across AC power lines. The series comprises a Nylon molded package with tin plated lead frame for soldering to board. The surface mount SM7 Series is based on radial 7mm internal varistor element with similar characteristics to the Littelfuse LA / ZA series of varistor. Features to leaded types LA/ZA series Agency Approvals Agency Agency File Number and reel power meters Absolute Maximum Ratings Continuous Steady State Applied Voltage: ) ) V V SM7 Series Units Transients: Peak Pulse Current (ITM) μ μs Current Wave (WTM) ) A ) V A J O O C C ) of Clamping Voltage (VC %/OC V MΩ 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. ©2010 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/sm7.html for current information. Revision: January 10, 2011 SM7 Series Varistor SM7 Series Varistor Products Surface Mount Varistors > SM7 Series SM7 Series Ratings & Specifications Maximum Rating (85°C) Continuous Transient V Part Number VM(AC) (V) V V (V) Specifications (25°C) Maximum Clamping Energy Peak Current Voltage 10 x 1000μs 8 x 20μs 8 x 20 μs WTM ITM VNOM Min VNOM Max VC IPK (J) (A) (V) (V) (V) (A) Varistor Voltage at 1mA DC Test Current Typical Capacitance f = 1MHz C (pF) Peak Current, Energy and Power Derating Curve surge current and energy ratings must be reduced as shown below Peak Pulse Current Test Waveform for Clamping Voltage PERCENT OF PEAK VALUE Test 100 100 PERCENT OF RATED VALUE 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 150 50 0 t1 t O1 TIM E t = Virtual Origin of Wave AMBIENT TEMPERATURE ( oC) V-I Limit Curves T T Example 8μs = T μs = T μ Pulse Rating Curves 2000 V510SM7 V480SM7 1500 V460SM7 V420SM7 V385SM7 10000 Voltage(V) Surge Current (A) 1000 V320SM7 V300SM7 1000 1 2 10 104 105 106 100 500 10 103 2 0 0.001 10 0.01 0.1 1 10 100 1000 Current(A) 1 10 100 1000 Impulse Duration (μs) 10000 If pulse ratings V V SM7 Series Varistor Revision: January 10, 2011 ©2010 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/sm7.html for current information. Varistor Products Surface Mount Varistors > SM7 Series Lead (Pb) Soldering Recommendations Reflow Solder Profile 250 200 TEMPERATURE °C MAXIMUM TEMPERATURE 230°C 150 100 50 40-80 SECONDS ABOVE 183°C RAMP RATE SM7 Series Product Dimensions 11.5±0.3 0.3 max 8.3±0.3 Part Numbering System V 275 SM7 For “VARISTOR” 6.0±0.3 1.5±0.3 3.0±0.3 All dimensions shown in milimeters V M(AC) (Three digits -- 275V to 510V) SM7 SERIES 6.5 13.1 Soldering Pad Layout 3.5 Tape & Reel Specifications Carrier Tape P0 P2 P1 D0 mm W T A0 B0 5° W A A F B E B0 K0 E 3.60 B A0 11.30 10° 5° 2 6.2 K0 D1 F P0 T B-B P1 P2 D0 D1 A-A Plastic Reel DETAIL H 2±0.5 Ø .2 ±0 13 Ø330 Ø21 Ø100 ±0.8 R1 16.5 120° DETAIL H 21.5±0.4 SM7 Series Varistor Revision: January 10, 2011 ©2010 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/sm7.html for current information.