V131NA34 LITTELFUSE | Alldatasheet

Document overview

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Technical content

Features

  • Provided in Disc Form for Unique Packaging by Customer
  • Solderable Electrode Finish.
  • Pressure Contacts and/or Disc Stacking may be Utilized
  • Wide Operating Voltage Range
  • No Derating Up to 8 oC Ambient ALSO SEE HB34 SERIES

123www.littelfuse.com Varistor Products 2VARISTOR PRODUCTS High Energy Industrial Square Disc NA Varistor Series Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart Continuous: Steady State Applied Voltage: Transient: Peak Pulse Current (ITM) Single Pulse Energy Range OC 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. Device Ratings and Specifications NA SERIES UNITS MODEL NUMBER SIZE MAXIMUM RATINGS (85oC) SPECIFICATIONS (25 oC) CONTINUOUS TRANSIENT VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MAXIMUM CLAMPING VOLTAGE (VC) AT 200A (8/20µs) TYPICAL CAPACI- TANCEVRMS VDC ENERGY (2ms) PEAK CURRENT (8/20µs) VM(AC) VM(DC) WTM ITM MIN V N(DC) MAX V C f = 1MHz (mm) (V) (V) (J) (A) (V) (V) (V) (V) (pF) V131NA34 V141NA34 130 140 175 188 270 291 40,000 184 198 220 200 228 248 345 375 10,000 V151NA34 34 150 200 300 40,000 212 240 268 405 8,000 9,000 V251NA34 34 250 330 370 40,000 354 390 429 650 5,000 V271NA34 34 275 369 400 40,000 389 430 473 730 4,500 V321NA34 34 320 420 460 40,000 462 510 561 830 3,800 V421NA34 34 420 560 600 40,000 610 680 748 1,130 3,000 V481NA34 34 480 640 650 40,000 670 750 825 1,240 2,700 V511NA34 34 510 675 700 40,000 735 820 910 1,350 2,500 V571NA34 34 575 730 770 40,000 805 910 1000 1,480 2,200 V661NA34 34 660 850 900 40,000 940 1050 1160 1,720 2,000 V751NA34 34 750 970 1050 40,000 1080 1200 1320 2,000 1,800 NOTE: Average power dissipation of transients not to exceed 2.0W. 40,0003 1. Peak current applies to applications rated up to 115V . Peak current is 30kA for applications greater than 115V . 2. Peak current applies to applications rated up to 132V . Peak current is 30kA for applications greater than 132V . 3. Peak current applies to applications rated up to 123V . Peak current is 30kA for applications greater than 123V . RMS RMS RMS RMS RMS RMS

FIGURE 1. CURRENT, ENERGY AND POWER DERA TING FIGURE 2. PEAK PULSE CURRENT TEST WA VEFORM FIGURE 3. CLAMPING VOL TAGE FOR V131NA34 - V751NA34

130 TO 750 VM(AC) RA TING

FIGURE 4. SURGE CURRENT RA TING CURVES FOR 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. requirements. Also see HB34 Series.

126 www.littelfuse.com Varistor Products NA Varistor Series Passivation Layer The standard NA Series is supplied with passivation layer around the outside perimeter of the disc forming an electrical insulator as detailed in the dimensional drawing. Encapsulated Recommendations After lead attachment, the disc/lead assembly may be coated or encapsulated in a package to provide electrical insulation and isolation from environmental contamination as required by the application. Coating/Filler materials for containers may include silicones, polyurethanes, and some epoxy resins. Two examples of acceptable polyurethanes are Dexter Hysol (US7013, parts A and B) and Rhenatech (resin 4714, hardener 4900), or their equivalents. Materials containing halogens, sulfides, or alkalines are not recommended. Electrode Metallization The NA Series is supplied with a sintered silver metallization for the electrode finish. The silver metallization is typically used for solder reflow lead attach operations (I-R, Vapour-Phase). The recommended temperature profile of a belt-fed convection oven is shown in Figure 6. Stacking and Contact Pressure Recommendations When applications require the stacking of Littelfuse NA discs or when electrical connection is made by pressure contacts, the minimum pres- sure applied to the disc electrode surface should be 2.2kGs (5 pounds). The maximum recommended pressure applied to the disc electrode is 16N/CM 2 (23LBs/IN2). Packaging and Shipping The NA Series is supplied in bulk for shipment. Discs are packaged in compartmentalized cartons to protect from scratching or edge-chipping during shipment. TEMPERA TURE (oC) 250 200 150 100 0 100 200 300 400 500 600 700 800 900 TIME (SEC) FIGURE 6. TYPICAL BEL T OVEN TEMPERA TURE PROFILE

Ordering Information

(FIRST SIGNIFICANT DIGITS) VM(AC) DISC SIZE (mm) SERIES DESIGNATOR VM(AC) VOLTAGE DECADE MULTIPLIER V 25 1 NA 34 High Energy Industrial Square Disc