wsr www.vishay.com vishay dale revision: 17-jan-13 1 document number: 30101 for technical questions, contact: ww2bresistors@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 power metal strip ? resistors, low value (down to 0.001 ? ), surface mount features ? molded high temperature encapsulation ? ideal for all types of current sensing, voltage division and pulse applications including switching and linear power supplies, instruments, power amplifiers ? proprietary processing technique produces extremely low resistance values (down to 0.001 ? ) ? all welded construction ? solid metal nickel-chrome or manganese- copper alloy resistive element with low tcr (< 20 ppm/c) ? solderable terminations ? very low inductance 0.5 nh to 5 nh ? excellent frequency response to 50 mhz ? low thermal emf (< 3 v/c) ? aec-q200 qualified (1) ? material categorization: for definitions of compliance please see www.vishay.com/doc?99912 notes * lead (pb)-containing terminations are not rohs-compliant. exemptions may apply. (1) flame retardance test may not be applicable to some resistor technologies. notes ? part marking: dale, model, value, tolerance, date code. (2) the wsr3 requires a minimum of 1050 sq. mil. circuit traces connecting to the recommended solder pad. standard electrical specifications global ? model size power rating p 70 c w resistance value range ? weight (typical) g/1000 pieces tol. 0.5 % tol. 1.0 % WSR2 4527 2.0 0.005 to 1.0 0.001 to 1.0 440 wsr3 4527 3.0 (2) 0.005 to 0.2 0.001 to 0.2 440 technical specifications parameter unit WSR2 and wsr3 resistor characteristics temperature coefficient ppm/c 75 for 0.010 ? to 1.0 ? ; 110 for 0.005 ? to 0.0099 ? ; 300 for 0.004 ? to 0.0049 ??? 450 for 0.003 ? to 0.0039 ? ; 600 for 0.002 ? to 0.0029 ? ; 750 for 0.001 ? to 0.0019 ? element tcr ppm/c < 20 dielectric withstanding voltage v ac > 500 insulation resistance ? > 10 9 operating temperature range c - 65 to + 275 maximum working voltage v ( p x r ) 1/2 global part number information global part numberin g example: WSR25l000fea global model value tolerance code packaging code special WSR2 wsr3 l = m ? * r = decimal 5l000 = 0.005 ? r0100 = 0.01 ? * use l for resistance values < 0.01 ? d = 0.5 % f = 1.0 % j = 5.0 % ea = lead (pb)-free, tape/reel ek = lead (pb)-free, bulk ta = tin/lead, tape/reel (r86) ba = tin/lead, bulk (b43) (dash number) (up to 2 digits) from 1 to 99 as applicable historical part numbering example: WSR2 0.005 ? 1 % ea WSR2 0.005 ? 1 % ea historical model resistance value tolerance code packaging code r25l 00f 0 ws a e
wsr www.vishay.com vishay dale revision: 17-jan-13 2 document number: 30101 for technical questions, contact: ww2bresistors@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 dimensions derating note ? embossed carrier tape per eia-481. model dimensions in inches (millimeters) lhtww 1 WSR2 ? wsr3 0.455 0.032 (11.56 0.813) 0.095 0.005 (2.41 0.127) 0.100 0.010 (2.54 0.254) 0.275 0.005 (6.98 0.127) 0.215 0.005 (5.46 0.127) model solder pad dimensions in inches (millimeters) abl WSR2 ? wsr3 0.155 (3.94) 0.230 (5.84) 0.205 (5.21) performance test conditions of test test limits WSR2 wsr3 thermal shock - 55 c to + 150 c, 1000 cycl es, 15 min at each extreme (0.5 % + 0.0005 ? ) ? r (0.5 % + 0.0005 ? ) ? r short time overload WSR2: 5 x rated power for 5 s wsr3: 4 x rated power for 5 s (0.5 % + 0.0005 ? ) ? r (2.0 % + 0.0005 ? ) ? r low temperature storage - 65 c for 24 h (0.5 % + 0.0005 ? ) ? r (0.5 % + 0.0005 ? ) ? r high temperature ? exposure 1000 h at + 275 c (1.0 % + 0.0005 ? ) ? r (1.0 % + 0.0005 ? ) ? r bias humidity + 85 c, 85 % rh, 10 % bias, 1000 h (0.5 % + 0.0005 ? ) ? r (0.5 % + 0.0005 ? ) ? r mechanical shock 100 g s for 6 ms, 5 pulses (0.5 % + 0.0005 ? ) ? r (0.5 % + 0.0005 ? ) ? r vibration frequency varied 10 hz to 2000 hz in 1 min, 3 directions, 12 h (0.5 % + 0.0005 ? ) ? r (0.5 % + 0.0005 ? ) ? r load life 1000 h at rated power, + 70 c, 1.5 h on, 0.5 h off (1.0 % + 0.0005 ? ) ? r (2.0 % + 0.0005 ? ) ? r resistance to solder heat + 260 c solder, 10 s to 12 s dwell, 25 mm/s emergence (0.5 % + 0.0005 ? ) ? r (0.5 % + 0.0005 ? ) ? r moisture resistance mil-std-202, method 106, 0 % power, 7a and 7b not required (0.5 % + 0.0005 ? ) ? r (0.5 % + 0.0005 ? ) ? r w l t w 1 h i a b - 65 - 25 25 75 125 175 225 275 ambient temperature c 70 0 20 40 60 80 100 120 rated power in % packaging model reel tape width diameter pieces/reel code WSR2 and wsr3 24 mm/embossed plas tic 330 mm/13" 1500 ea
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