rs, ns vishay dale www.vishay.com 114 document number 30204 revision 18-oct-00 for technical questions, contact ww2bresistors@vishay .com features ? high temperature coating ? complete welded construction ? meets applicable requirements of mil-prf-26 ? available in non-inductive styles (type ns) with aryton-perry winding for lowest reactive components ? excellent stability in operation wirewound resistors, military, mil-prf-26 qualified, type rw, precision power, silicone coated parameter unit rs resistor characteristics temperature coefficient ppm/ c 90 for below 1 ? , 50 for 1 ? to 9.9 ? , 20 for 10 ? and above dielectric withstanding voltage v ac 500 minimum for rs-1/8 thru rs-1a, 1000 minimum for all others short time overload C 5 x rated power for 5 seconds for 3.75 watt size and smaller, 10 x rated power for 5 seconds for 4 watt size and greater maximum working voltage v (p x r) 1/2 insulation resistance ? 1000 megohm minimum dry, 100 megohm minimum after moisture test terminal strength lb 5 minimum for rs-1/8 thru rs-1a, 10 minimum for all others solderability C mil-prf-26 type - meets requirements of ansi j-std-002 non mil type - terminals are 60/40 electro tin plated to facilitate soldering operating temperature range c characterisitic u = - 65/+ 250, characteristic v = - 65/+ 350 power rating C characteristic u - + 250 c max. hot spot temperature, 0.5% max. ? r in 2000 hr. load life characteristic v - + 350 c max. hot spot temperature, 3.0% max. ? r in 2000 hr. load life technical specifications ordering information rs-1a 10 ? 1.0% model resistance tolerance ? % standard electrical specifications resistance range mil. range shown in bold face ? *standard tolerance is 5% 1 ohm and above, 10% below 1 ohm. **vishay dale rs models have two power ratings depending on operation temperature and stability requirements. note: shaded area indicates most popular models. uv 0.05% thru .5%, 1% type 0.5% 3% & 5% .05% 0.1% .25% 3%, 5% g rs-1/8 .125 0.1 - 950 0.15 rs-1/4 .4 1 - 1k 0.499 - 1k 0.499 - 3.4k 0.1 - 3.4k 0.21 rs-1/2 .75 1 - 1.3k 0.499 - 1.3k 0.499 - 4.9k 0.1 - 4.9k 0.23 rs-1a 1.0 1 - 2.74k 0.499 - 2.74k 0.499 - 10.4k 0.1 - 10.4k 0.34 rs-1a-300 rw70 1.0 0.499 - 2.74k 0.499 - 2.74k 0.1 - 2.74k 0.34 rs-1m 1.0 1 - 1.32k 0.499 - 1.67k 0.499 - 6.85k 0.1 - 6.85k 0.30 rs-2 4.0 5.5 0.499 - 12.7k 0.499 - 12.7k 0.1 - 47.1k 0.1 - 47.1k 2.10 rs-2m 3.0 0.499 - 4.49k 0.499 - 4.49k 0.1 - 18.74k 0.1 - 18.74k 0.65 rs-2b 3.0 3.75 0.499 - 6.5k 0.499 - 6.5k 0.1 - 24.5k 0.1 - 24.5k 0.70 rs-2b-300 rw79 3.0 0.499 - 6.49k 0.1 - 6.49k 0.1 - 6.49k 0.70 rs-2c 2.5 3.25 0.499 - 8.6k 0.499 - 8.6k 0.1 - 32.3k 0.1 - 32.3k 1.6 rs-2c-17 2.5 3.25 0.499 - 6.8k 0.499 - 8.6k 0.1 - 32.3k 0.1 - 32.3k 1.6 rs-2c-23* rw69 3.0 0.1 - 2.0k 1.6 rs-5 5.0 6.5 0.499 - 25.7k 0.499 - 25.7k 0.1 - 95.2k 0.1 - 95.2k 4.2 rs-5-69 rw74 5.0 0.499 - 24.3k 0.1 - 24.3k 0.1 - 24.3k 4.2 rs-5-70* rw67 6.5 0.1 - 8.2k 4.2 rs-7 7.0 9.0 0.499 - 41.4k 0.499 - 41.4k 0.1 - 154k 0.1 - 154k 4.7 rs-10 10.0 13.0 0.499 - 73.4k 0.499 - 73.4k 0.1 - 273k 0.1 - 273k 9.0 rs-10-38 rw78 10.0 0.499 - 71.5k 0.1 - 71.5k 0.1 - 71.5k 9.0 rs-10-39* rw68 11.0 0.1 - 20k 9.0 power rating** p 25 c w weight (typical) model mil-prf-26
www.vishay.com 115 rs, ns vishay dale document number 30204 revision 18-oct-00 for technical questions, contact ww2bresistors@vishay .com dimensions wirewound resistors, military, mil-prf-26 qualified, type rw, precision power, silicone coated model dimensions in inches [millimeters] material specifications element: copper-nickel alloy or nickel-chrome alloy, depending on resistance value core: ceramic, steatite or alumina, depending on physical size coating: special high temperature silicone standard terminals: tinned copperweld ? end caps: stainless steel deviations for rs-1/8: thermoset silicone molded construction, endcaps will be nickel-silver alloy and terminals will be tinned copper part marking: dale, model, wattage*, value, tolerance, date code c d a 1.50 [38.10]* min. b ab c d (max.)** rs-1/8 0.155 0.015 0.065 0.015 0.020 0.002 [3.94 0.381] [1.65 0.381] [0.508 0.051] rs-1/4 0.250 0.031 0.281 0.085 0.020 0.020 0.002 [6.35 0.787] [7.14] [2.16 0.508] [0.508 0.051] rs-1/2 0.312 0.016 0.328 0.078 + 0.016 - 0.031 0.020 0.002 [7.92 0.406] [8.33] [1.98 + 0.406 - 0.787] [0.508 0.051] rs-1a 0.406 0.031 0.437 0.094 0.031 0.020 0.002 rs-1a-300 [10.31 0.787] [11.10] [2.39 0.787] [0.508 0.051] rs-1m 0.285 0.025 0.311 0.110 0.015 0.020 0.002 [7.24 0.635] [7.90] [2.79 0.381] [0.508 0.051] rs-2 0.625 0.062 0.765 0.250 0.031 0.040 0.002 [15.88 1.57] [19.43] [6.35 0.787] [1.02 0.051] rs-2m 0.500 0.062 0.562 0.185 0.015 0.032 0.002 [12.70 1.57] [14.27] [4.70 0.381] [0.813 0.051] rs-2b 0.560 0.062 0.622 0.187 0.031 0.032 0.002 rs-2b-300 [14.22 1.57] [15.80] [4.75 0.787] [0.813 0.051] rs-2c 0.500 0.062 0.593 0.218 0.031 0.040 0.002 [12.70 1.57] [15.06] [5.54 0.787] [1.02 0.051] rs-2c-17 0.500 0.062 0.593 0.218 0.031 0.032 0.002 [12.70 1.57] [15.06] [5.54 0.787] [0.813 0.051] rs-2c-23 0.500 0.062 0.593 0.218 0.031 0.032 0.002 [12.70 1.57] [15.06] [5.54 0.787] [0.813 0.051] rs-5 0.875 0.062 1.0 0.312 0.031 0.040 0.002 [22.23 1.57] [25.4] [7.92 0.787] [1.02 0.051] rs-5-69 0.875 0.062 0.937 0.312 0.031 0.040 0.002 [22.23 1.57] [23.80] [7.92 0.787] [1.02 0.051] rs-5-70 0.875 0.062 1.0 0.312 0.031 0.040 0.002 [22.23 1.57] [25.4] [7.92 0.787] [1.02 0.051] rs-7 1.22 0.062 1.28 0.312 0.031 0.040 0.002 [30.99 1.57] [32.51] [7.92 7.87] [1.02 0.051] rs-10 1.78 0.062 1.87 0.375 0.031 0.040 0.002 [45.21 1.57] [47.50] [9.53 0.787] [1.02 0.051] rs-10-38 1.78 0.062 1.84 0.375 0.031 0.040 0.002 [45.21 1.57] [46.74] [9.53 0.787] [1.02 0.051] rs-10-39 1.78 0.062 1.87 0.375 0.031 0.040 0.002 [45.21 1.57] [47.50] [9.53 0.787] [1.02 0.051] *on some standard reel pack methods, the leads may be trimmed to a shorter length than shown. note: rs-1/8 terminal length will be 1.0" [25.4mm] minimum. **b (max.) dimension is clean lead to clean lead. ns non-inductive models of equivalent physical and electrical specifications are available with non-inductive (aryton-perry) winding. they are identified by substituting the letter n for r in the model number (ns-5, for example). two conditions apply: 1. for ns models, divide maximum resistance values by two 2. body o.d. on ns-2c may exceed that of the rs-2c by 010" *all ? r figures shown are maximum, based upon testing requirements per mil-prf-26. performance* test conditions of test test limits characteristic u characteristic v thermal shock rated power applied until thermally stable, then a min. of 15 minutes at - 55 c (0.2% + 0.05 ? ) ? r (2.0% + 0.05 ? ) ? r short time overload 5 x rated power (3.75 watt and smaller), 10 x rated power (4 watt and larger) for 5 seconds (0.2% + 0.05 ? ) ? r (2.0% + 0.05 ? ) ? r dielectric withstanding voltage 500 minimum for rs-1/8 thru rs-1a, 1000 for all others, duration of 1 minute (0.1% + 0.05 ? ) ? r (0.1% + 0.05 ? ) ? r low temperature storage - 65 c for 24 hours (0.2% + 0.05 ? ) ? r (2.0% + 0.05 ? ) ? r high temperature exposure 250 hours at: u = + 250 c, v = + 350 c (0.5% + 0.05 ? ) ? r (2.0% + 0.05 ? ) ? r moisture resistance mil-std-202 method 106, 7b not applicable (0.2% + 0.05 ? ) ? r (2.0% + 0.05 ? ) ? r shock, specified pulse mil-std-202 method 213, 100g's for 6 milliseconds, 10 shocks (0.1% + 0.05 ? ) ? r (0.2% + 0.05 ? ) ? r vibration, high frequency frequency varied 10 to 2000hz, 20g peak, 2 directions 6 hours each (0.1% + 0.05 ? ) ? r (0.2% + 0.05 ? ) ? r load life 2000 hours at rated power, + 25 c, 1.5 hours on, 0.5 hours off (0.5% + 0.05 ? ) ? r (3.0% + 0.05 ? ) ? r 5 to 10 sec., 5 or 10 lb pull test (depending on size), torsion test - 3 alternating directions, 360 each terminal strength (0.1% + 0.05 ? ) ? r (1.0% + 0.05 ? ) ? r *wattage marked on part will be "u" characteristic derating 120 100 80 60 40 20 0 -65 -50 0 50 150 250 350 ambient temperature in c rated power in % char. v char. u 25
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