document number: 30220 revision 28-mar-02 www.vishay.com 134 spu molded style vishay dale for technical questions, contact ww2bresistors@vishay .com wirewound resistors, molded style, current shunts, very low value, four terminal ordering information features ? molded four-terminal resistors for specialized applications ? extremely low resistance values for current sensing applications ? precision resistance tolerance ? low temperature coefficients ? complete welded construction standard electrical specifications model power rating * resistance range weight p 25 c ? (typical) w 1% g spu-50 1 0.001 - 0.060 2.5 spu-51 2 0.001 - 0.060 3.7 spu-52 4 0.001 - 0.200 4.8 spu-53 5 0.010 - 0.500 10.8 *wattage rating is limited to 25 amperes maximum. technical specifications parameter unit spu molded style resistor characteristics temperature coefficient ppm/ c - 100 (- 10 c to + 80 c) dielectric withstanding voltage v ac 500 minimum short time overload - 5 x power for 5 seconds, limited to 25 amperes maximum maximum working voltage v (pxr) 1/2 insulation resistance ? 10,000 megohm minimum dry spu-52 0.100 ? 5% model resistance tolerance ? % ? resistance tolerance available is 0.1%, 0.25%, 0.5%, 1.0%, 3.0% and 5.0% depending on resistor physical design and resistance value.
www.vishay.com 135 spu molded style vishay dale document number: 30220 revision 28-mar-02 for technical questions, contact ww2bresistors@vishay .com * limited to 25 amperes maximum. wirewound resistors, molded style, current shunts, very low value, four terminal dimensions material specifications element: nickel-chromium alloy or copper-manganese alloy, depending on resistance value molding material: spu-50/51 thermo-set epoxy spu-52/53 thermo-set silicone terminals: spu-50/51 tinned copperweld ? spu-52/53 tinned copper part marking: dale, model, wattage, value, tolerance, date code ambient temperature derating derating is required for ambient temperature above 25 c per the following graph 18 awg 0.040 0.002 [1.02 0.051] c b a d a 0.660 0.010 [16.76 0.25] 0.790 0.010 [20.06 0.25] 1.000 0.010 [25.40 0.25] 1.870 0.010 [47.50 0.25] b 0.312 0.010 [7.92 0.25] 0.375 0.010 [9.52 0.25] 0.375 0.010 [9.52 0.25] 0.437 0.010 [11.10 0.25] c 0.200 0.015 [5.08 0.38] 0.200 0.015 [5.08 0.38] 0.125 0.015 [3.17 0.38] 0.125 0.015 [3.17 0.38] d 1.000 + 0.25 - 0.125 [25.40 + 6.35 - 3.17] 1.000 + 0.25 - 0.125 [25.40 + 6.35 - 3.17] 1.000 minimum [25.40 minimum] 1.000 minimum [25.40 minimum] spu-50 spu-51 spu-52 spu-53 model dimensions in inches [millimeters] derating 120 100 80 60 40 20 0 rated power in % -55 -50 0 50 100 150 200 250 275 ambient temperature in c spu-52 & 53 spu-50 & 51 25 175
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