document number: 30108 revision 11-aug-04 www.vishay.com 100 wsk vishay dale for technical questions, contact ww2bresistors@vishay .com features ? 4-terminal design allows for 1% tolerance down to 0.001 ? and 0.5% tolerance down to 0.003 ? ? ideal for all types of precision current sensing, voltage division and pulse applications including switching and linear power supplies, instruments, power amplifiers ? proprietary processing technique produces extremely low resistance values ? all welded construction ? solid metal nickel-chrome or manganese-copper alloy resistive element ? solderable terminations ? very low inductance 0.5 h to 5 h ? excellent frequency response global power rating resistance range model p 70 c ? w 0.5% 1.0% wsk2512 1.0 0.003 C 0.025 0.001 C 0.025 power metal strip ? resistors, low value, surface mount, 4 - terminal standard electrical specifications ? part marking: dale, value, tolerance; due to resistor size limitations some resistance values will be marked with only the res istance value. technical specifications parameter unit wsk2512 temperature coefficient ppm/ c 0.001 ? - 0.0029 ? = 250 0.003 ? - 0.0049 ? = 75 0.005 ? - 0.025 ? = 35 operating temperature range c - 65 / + 170 maximum working voltage v (p x r) 1/2 weight/1000 pieces g 63.6 global model resistance value tolerance p ackaging special wsk2512 l = milliohm code code (dash number) r = decimal d = 0.5% ea = lead free, tape/reel (up to 2 digits) 5l000 = 0.005 ? f = 1.0% ek = lead free, bulk from 1-99 as r0100 = 0.01 ? ta = tin/lead, tape/reel (r86) applicable ba = tin/lead, bulk (b43) historical part numbering: wsk2512 0.005 ? 1% ea (will continue to be accepted) new global part numbering: wsk25125l000fea (preferred part numbering format) global part number information wsk2512 0.005 ? 1% ea historical model resistance value tolerance packaging code wsk251 25l000fea
www.vishay.com 101 wsk vishay dale document number: 30108 revision 11-aug-04 for technical questions, contact ww2bresistors@vishay .com dimensions power metal strip ? resistors, low value, surface mount, 4 - terminal test conditions of test test limits thermal shock - 55 c to + 150 c, 1000 cycles, 15 minutes at each extreme (0.5% + 0.0005 ? ) ? r short time overload 5 x power for 5 seconds (0.5% + 0.0005 ? ) ? r low temperature storage - 65 c for 24 hours (0.5% + 0.0005 ? ) ? r high temperature exposure 1000 hours at + 170 c (1.0% + 0.0005 ? ) ? r bias humidity + 85 c, 85% rh, 10% bias, 1000 hours (0.5% + 0.0005 ? ) ? r mechanical shock 100gs for 6 milliseconds, 5 pulses (0.5% + 0.0005 ? ) ? r vibration frequency varied 10 to 2,000hz in one minute, 3 directions, 12 hours (0.5% + 0.0005 ? ) ? r load life 1,000 hours @ rated power, + 70 c, 1.5 hours on, 0.5 hours off (1.0% + 0.0005 ? ) ? r resistance to solder heat + 260 c solder, 10 C 12 second dwell, 25mm/second emergence (0.5% + 0.0005 ? ) ? r moisture resistance mil-std-202 method 106, 0% power, 7a and 7b not required (0.5% + 0.0005 ? ) ? r performance model dimensions in inches [millimeters] resistance l w h t a b range ? 0.001 C 0.0049 0.250 0.010 0.125 0.010 0.025 0.010 0.087 0.010 0.030 0.010 0.020 0.010 wsk2512 [6.35 0.254] [3.18 0.254] [0.635 0.254] [2.21 0.254] [0.762 0.254] [0.508 0.254] 0.005 - 0.025 0.250 0.010 0.125 0.010 0.025 0.010 0.047 0.010 0.030 0.010 0.020 0.010 [6.35 0.254] [3.18 0.254] [0.635 0.254] [1.19 0.254] [0.762 0.254] [0.508 0.254] model solder pad dimensions in inches [millimeters] ab cdei wsk2512 0.125 [3.18] 0.130 [3.30] 0.030 [0.76] 0.020 [0.51] 0.055 [1.40] 0.065 [1.65] packaging model reel tape width diameter pieces/reel code wsk2512 12mm/embossed plastic 178mm/7 2000 r86 embossed carrier tape per eia-481-1a 70 0 derating -65 -55 -25 0 25 50 75 100 125 150 170 rated power in % ambient temperature c 20 40 60 80 100 120 l h i a e c d b a b t w
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