Metal-Oxide Varistors (MOVs) Surface Mount Varistors > SM7 Series SM7 Varistor 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 85ºC with peak pulse current of 1200A. Features • Electrical equivalent • Good solderability to leaded types • Available in tape Agency Approvals LA/ZA series and reel • AC Voltage Rating Agency Agency Approval Agency File Number • Application of AC 50 to 510VAC rms power meters UL1449 E320116 • No De-Rating up • Lead free and to 85°C ambient RoHS compliant 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 ) 50 to 510 V M(AC)RMS DC Voltage Range (V ) 68 to 675 V M(DC) Transients: Peak Pulse Current (I ) TM For 8/20µs Current Wave (See Figure 2) 1200 A Single Pulse Energy Range For 10/1000µs Current Wave (W ) 10 to 40 J TM Operating Ambient Temperature Range (T) -40 to +85 OC A Storage Temperature Range (T ) -55 to +125 OC STG Temperature Coefficient (aV) of Clamping Voltage (V) at Specified Test Current <0.01 %/OC C Hi-Pot Encapsulation (COATING Isolation Voltage Capability) 2500 V (Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301) COATING Insulation Resistance 1000 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. Additional Information Datasheet Resources Samples © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Metal-Oxide Varistors (MOVs) Surface Mount Varistors > SM7 Series SM7 Series Ratings & Specifications Maximum Rating (85°C) Specifications (25°C) Continuous Transient Varistor Voltage Maximum Clamping Typical Energy Peak Current at 1mA DC Voltage Capacitance V V RMS DC 10 x 1000µs 8 x 20µs Test Current 8 x 20 µs f = 1MHz Part V V W I V Min V Max V I C M(AC) M(DC) TM TM NOM NOM C PK Number (V) (V) (J) (A) (V) (V) (V) (A) (pF) V50SM7 50 68 4 1200 73 91 135 10 700 V60SM7 60 81 5 1200 90 110 165 10 600 V115SM7 115 153 10 1200 162 198 300 10 200 V130SM7 130 175 11 1200 184 228 340 10 180 V140SM7 140 180 12 1200 198 242 360 10 160 V150SM7 150 200 13 1200 212 268 395 10 150 V175SM7 175 225 15 1200 247 303 455 10 130 V230SM7 230 300 20 1200 324 396 595 10 100 V250SM7 250 330 21 1200 354 429 650 10 90 V275SM7 275 369 23 1200 389 473 710 10 80 V300SM7 300 405 25 1200 420 517 775 10 70 V320SM7 320 420 25 1200 462 565 850 10 65 V385SM7 385 505 27 1200 558 682 1025 10 60 V420SM7 420 560 30 1200 610 748 1120 10 55 V460SM7 460 615 37 1200 640 790 1190 10 55 V480SM7 480 640 35 1200 670 825 1240 10 50 V510SM7 510 675 40 1200 735 910 1200 10 45 Product Dimensions Part Numbering System 11.4±0.3 8.3±0.3 V 275 SM7 3.6+/-0.3 for x a V50SM7-V60SM7 m 3 6.0+/-0.3 for For “VARISTOR” 0. V115SM7 to V510SM7 VM(AC) 1.5±0.3 3.0±0.3 (Three digits -- 115V to 510V) 6.5 3.5 All dimensions shown SM7 SERIES in milimeters 13.1 Soldering Pad Layout © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Metal-Oxide Varistors (MOVs) Surface Mount Varistors > SM7 Series Lead (Pb) Soldering Recommendations The principal techniques used for the soldering of Reflow Solder Profile components in surface mount technology are IR Re-flow and Wave soldering. Typical profiles are shown on the right. 225500 The terminals of SM7 series devices are tin plated copper, MMAAXXIIMMUUMM TTEEMMPPEERRAATTUURREE and the recommended solder is 62/36/2 (Sn/Pb/Ag), 60/40 223300°°CC 222005000 (Sn/Pb) or 63/37 (Sn/Pb). Littelfuse also recommends an 4400--8800 CC MAXIMUM TEMPERATSSUEERCCEOONNDDSS RMA solder flux. RE °RE ° 211055000 230°C AABBOOVVEE 118833°°CC WTthoea avrvmeo asidlo sltdhheoerc ipnko,g sa is spi btrheiliehty em aotof ssgttea sngteerer ianntu itnohgue ss s toorefl dstehsreeins p gdr oupcereo tscose esss. TEMPERATUTEMPERATUATURE °C 111005000 PPRREEHHEEAATT DDWWEELLR<R<RLL22AAA°°MMMCCPP//Pss RRRAAAABSTTTOEEEE4CV0EO-8 N108D3S°C R <2°C/s is recommended, and the peak temperature of the solder PE 1055000 PPRREEHHEEAATT ZZOONNEE process should be rigidly controlled. EM PREHEAT DWELL T 5000 PREHEAT ZONE When using a reflow process, care should be taken to 00 00..55 11..00 11..55 22..00 22..55 33..00 33..55 44..00 ensure that the SM7 chip is not subjected to a thermal TTIIMMEE ((MMIINNUUTTEESS)) 0 gradient steeper than 4 degrees per second; the ideal 0 FF 0IIGG.5UU RR EE 1 11.044 .. RR EE 1FF.5LL OO WW SS2.OO0 LL DD EE 2RR.5 PP RR OO FF3.II0LL EE 3.5 4.0 gradient being 2 degrees per second. During the soldering Wave Solder Profile TIME (MINUTES) process, preheating to within 100 degrees of the solder's FIGURE 14. REFLOW SOLDER PROFILE peak temperature is essential to minimize thermal shock. 330000 Once the soldering process has been completed, it is MMAAXXIIMMUUMM WWAAVVEE 226600°°CC still necessary to ensure that any further thermal shocks 225500 300 are avoided. One possible cause of thermal shock is hot CC printed circuit boards being removed from the solder RE °RE ° 222005000 MAXIMUM WAVE 260°C UU ptteorom lecpesessr sat htauanrnde 5.s T0uhºbCeje bbceotefaodrdr etso cm clelueasantni nbingeg. a slloolwveendt sto a tc oroool mgr adually TEMPERATTEMPERATATURE °C 111121005550000000 SSEECCOONNDD PPRREEHHEEAATT R E FFIIRRSSTT PPRREEHHEEAASTTECOND PREHEAT MP 5500 E 100 T 00 FIRST PREHEAT 5000..00 00..55 11..00 11..55 22..00 22..55 33..00 33..55 44..00 44..55 TTIIMMEE ((MMIINNUUTTEESS)) 0 0.0 0FF.5IIGGUURR1.0EE 1155..1.WW5AAVVEE2 .SS0OOLLDD2.EE5RR PPRR3.OO0FFIILL3EE.5 4.0 4.5 TIME (MINUTES) Lead–free (Pb-free) Soldering Recommendations FIGURE 15. WAVE SOLDER PROFILE The terminals of SM7 series devices are tin plated copper, and the recommended Lead-free solder is 96.5/3.0/0.5 Lead–33f00r00ee Re-flow Solder Profile MMAAXXIIMMUUMM TTEEMMPPEERRAATTUURREE 225500˚˚CC,, (SnAgCu) with an RMA flux, though there is a wide TTIIMMEE WWIITTHHIINN 55˚˚CC OOFF PPEEAAKK 225500 2200 SSEECCOONNDDSS MMAAXXIIMMUUMM selection of pastes and fluxes available that should be 300 compatible. RE °CRE °C222005000 MT20IAM SXEEI MWCUOITMNH DTINSE M5M˚PCAE XOR<R<RI33AAFMA˚˚ MMCCTUPU//PPEMssR ARREKAA 2TT5EE0˚C, 6600 >>-- 112255110077 ˚˚SSCCEECC UU iTsnoh tledh ereer iLflneogaw, dt –hpferro eWfiel eaRv meefl uSosowtl d bPeerr o cPfiorlnoesfi. tlFeroa sirn tLeileld aa bdpy–p fltirehesee. mWaaxviem ums TEMPERATTEMPERATATURE °C211111000555000000 PPRREEHHEEAATT ZZOOR<NN3AEE˚MC/Ps RATE 60 >- 125107 ˚SCEC R E Note: the Lead–free paste, flux and profile were used for MP 5500 evaluation purposes by Littelfuse, based upon industry TE100 PREHEAT ZONE standards and practices. There are multiple choices of all 00 5000 11..00 22..00 33..00 44..00 55..00 66..00 77..00 three available, it is advised that the customer explores the TTIIMMEE ((MMIINNUUTTEESS)) optimum combination for their process as processes vary 0 0 FF II GG UU RR1.EE0 11 66 .. LL 2EE.AA0 DD -- FF RR 3EE.EE0 RR EE -- FF4LL.0OO WW SS OO5.LL0DD EE RR PP6.RR0OO FF II LL EE7.0 considerably from site to site. TIME (MINUTES) FIGURE 16. LEAD-FREE RE-FLOW SOLDER PROFILE © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Metal-Oxide Varistors (MOVs) Surface Mount Varistors > SM7 Series Peak Pulse Current Test Waveform for Clamping Peak Current, Energy and Power Derating Curve Voltage For applications exceeding 85ºC ambient temperature, the peak surge current and energy ratings must be reduced as shown below st E Te LU100 A V 100 K A ALUE 9800 OF PE 50 D V 70 NT E E RAT 60 ERC OF 50 P 0 NT 40 O t TIME CE 30 1 t1 R PE 20 t 2 10 0 = Virtual Origin of Wave 0 1 -55 50 60 70 80 90 100 110 120 130 140 150 T = Time from 10% to 90% of Peak AMBIENT TEMPERATURE (oC) T = Rise Time = 1.25 x T 1 T = Decay Time 2 FIGURE 1. CURRENT, ENERGY AND POWER DERATING Example - For an 8/20 µs Current Waveform: CURVE 8µs = T = Rise Time V-I Limit Curves 1 20µs = T = Decay Time 2 2000 V510SM7 Pulse Rating Curves V480SM7 V460SM7 V420SM7 1500 V385SM7 V320SM7 10000 V) V300SM7 e( V250SM7 ag1000 V230SM7 olt V210SM7 1000 1 V V190SM7 A) 2 500 VV117550SSMM77 ent ( 10 104 105 VVV111143500SSSMMM777 ge Curr 100 110023 106 0 ur S 0.001 0.01 0.1 1 10 100 1000 Current(A) 10 NOTE: If pulse ratings are exceeded, a shift of VN(DC) (at specified current) of more than 1 ±10% could result. This type of shift, which normally results in a decrease of VN(DC), may 10 100 1000 10000 result in the device not meeting the original published specifications, but it does not prevent Impulse Duration (µs) the device from continuing to function, and to provide ample protection. Physical Specifications Environmental Specifications Operating Ambient Lead Material Folded Tin Plated Metal Leads -40°C to +85°C Temperature Range (T ) A Soldering Storage Temperature J-STD-002 -55°C to 125°C Characteristics Range(T ) STG Molded Plastic Meets UL94 V-0 Coating Solvent Resistance MIL STD 202, Method 215 Requirement Level 1, J-STD-020 (V115SM7 to Moisture Sensitivity V510SM7) 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. © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17

Metal-Oxide Varistors (MOVs) Surface Mount Varistors > SM7 Series Tape & Reel Specifications for V50SM7 amd V60SM7 Carrier Tape P0 mm P2 P1 D0 W 16.00±0.30 E T 0.40±0.05 A A B F W 5° A0 11.80±0.10 0 B B0 8.60±0.10 0 B D1 3.6 K0 4.80±0.10 T A0 E 1.75±0.10 B-B 11.30 15° F 7.50±0.10 2 P0 4.00±0.10 0 K P1 16.00±0.10 A-A m P2 2.00±0.10 m 0 4. D0 ø1.50 +0.10/-0 8 - 3. D1 ø1.50 +0.10/-0 Plastic Reel DETAIL H NOTES: 1) All dimensions per EIA-481-c Ø13±0.2 2±0.5Ø21±0.8 2) 1±00 p.2it0chmems cumulative tolerance on tape Ø100 Ø330 R1 3) Quantity per 13 inch (330 mm) reel: 600 pcs 16.5 120° DETAIL H 21.5±0.4 Tape & Reel Specifications for V115SM7 to V510SM7 Carrier Tape mm P0 P2 P1 W 16.00±0.30 D0 T 0.40±0.05 E A A B F A0 11.80±0.10 W 05° B0 8.60±0.10 B K0 6.80±0.10 0 B D1 3.6 E 1.75±0.10 T A0 11.30 B-B F 7.50±0.10 10° 5° P0 4.00±0.10 2 6.2K0 P1 16.00±0.10 P2 2.00±0.10 A-A D0 ø1.50 +0.10/-0 D1 ø1.50 +0.10/-0 Plastic Reel NOTES: DETAIL H 1) All dimensions per EIA-481-c Ø13±0.2 2±0.5Ø21±0.8 23)) 1Q±0u0 pa.2nit0tcihmtye msp ecru 1m3u ilnactihv e(3 t3o0le mramnc)e r eoenl :t 6ap0e0 pcs Ø100 Ø330 R1 16.5 120° DETAIL H 21.5±0.4 © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17