document number: 31038 revision 24-jul-02 www.vishay.com 112 SPW vishay dale for technical questions, contact ff2aresistors@vishay.com carbon film resistors, special purpose high frequency load (tubes) features ? high stability and excellent high frequency characteristics ? particularly suited for high frequency applications involving high power, high accuracy rf measurements ? carbon film construction applications high frequency wattmeters for output measurement in radio, tv and radar transmitters, dielectric heating and similar rf generating equipment. ideal for use as non-reactive radio frequency terminations. special high power designs with internal water cooling are available. contact factory. standard electrical specifications model SPW-236 SPW-227 SPW-210 SPW-214 SPW-212 marking power rating wattage free air @ + 25 c 120 55 40 10 2 resistance range 50 ohm standard. other values available on special order. identification: type designation resistance value, tolerance and code date of manufacture are printed on each unit. terminations: all types electroplated copper except SPW-212. the SPW-212 has silver coated termination bands. cooling: approximate increase in wattage when forced air cooling is employed is 3 times wattages shown and for liquid cooling (with heat exchanger) is 60 times wattages shown. the limiting factor insofar as the resistor is concerned is the film temperature. this should not exceed +200 c and for maximum stability should not exceed +150 c. ordering information SPW model 5 tolerance 25 ohm - 600 ohm available depending on model. please consult factory. 50 value 227 236 210 212 214 210 size dale model value tolerance date code 2% 5% 10% resistance tolerance 2%, 5% 2%, 5% 2%, 5% 2%, 5% 2%, 5% linearity tolerance 10% 10% 10% 10% 10% temperature coefficient 200ppm/ c average 250ppm/ c maximum mechanical specifications
www.vishay.com 113 SPW vishay dale document number: 31038 revision 24-jul-02 for technical questions, contact ff2aresistors@vishay.com load temperature rise [operation in free air] dimensions in inches [millimeters] * representative types only. consult factory for special requirements. note: 1. c dimension may be varied on special order. 2. wattage ratings do not allow for mounting hardware. 125 100 75 50 25 0 temperature rise per c 20 40 60 80 100 % of rated power model SPW-236 SPW-227 SPW-210 SPW-214 SPW-212* d (i.d.) 1.25 0.025 [31.75 0.64] 0.875 0.020 [22.23 0.51] 0.625 0.020 [15.88 0.51] 0.375 0.013 [9.53 0.33] solid rod a 18.0 0.062 [457.20 1.57] 12.0 0.062 [304.80 1.57] 12.0 0.062 [304.80 1.57] 5.0 0.032 [127.0 0.81] 2.0 0.062 [50.80 1.57] c (o.d.) 1.0 0.063 [25.40 1.60] 0.500 0 .032 [12.70 0.81] 0.625 0.032 [15.88 0.81] 0.500 0.032 [12.70 0.81] 0.250 0.032 [6.35 0.81] b 1.75 0.025 [44.45 0.64] 1.125 0.025 [28.58 0.64] .875 0.010 [22.23 0.25] .562 0.006 [14.27 0.81] .250 0.006 [6.35 0.15] c a b carbon film resistors, special purpose d
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