rph 100 www.vishay.com vishay sfernice revision: 22-nov-12 1 document number: 50046 for technical questions, contact: sfer@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 resistor for mounting onto a heatsink thick film technology features ? high power rating ? low thermal radiation of the case ? wide ohmic value range ? easy mounting ? high overload capabilities ? reduced size and weight ? material categorization: for definitions of compliance please see www.vishay.com/doc?99912 this new style has been developed as an extension to rch range. through the use of thick film technology, a non-inductive solution for power resistors is available which are rated up to 100 w at + 25 c. the terminations position prevents any risk o f an electrical arc to the heatsink. this resistor series ca n replace and offer advantages to standard wirewound devices. note ? tolerances unless stated: 0.2 mm note (1) e24 series dimensions in millimeters standard electrical specifications model size resistance range ? rated power p 25 c w limiting element voltage u l v tolerance % temperature coefficient ppm/c rph 100 100 0.092 to 1m (1) 100 1900 1, 2, 5, 10 150 65.2 0.4 35 25.6 0.4 37 46.7 42.4 0.5 16.6 18.5 0.4 21.15 0.7 4 ? 4.2 ? 4.2 v connections mechanical specifications mechanical protection insulated case ul 94 v-0 resistive element cermet substrate alumina on metallic base of nickel coated aluminum end connections v connections: screws m4 x 6 tightening torque connections 1 nm tightening to rque heatsink 3 nm weight 60 g 10 % environmental specifications thermal resistance r th (j - c) 0.55 c/w temperature range - 55 c to 125 c climatic category 55/125/56 technical specifications power rating continuous 100 w at 25 c chassis mounted 0.45 c/w 10 w at 25 c free air momentary temperature coefficient standard 300 ppm/c < 1 ? 150 ppm/c > 1 ? dielectric strength mil std 202 5 kv rms , 1 min, 10 ma max. insulation resistance ? 10 6 m ? inductance ? 0.1 h
rph 100 www.vishay.com vishay sfernice revision: 22-nov-12 2 document number: 50046 for technical questions, contact: sfer@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 recommendations for mounting onto a heatsink ? surfaces in contact must be carefully cleaned. ? the heatsink must have an acceptable flatness: from 0.05 mm to 0.1 mm/100 mm. ? roughness of the heatsink must be around 6.3 m. in order to improve thermal conductivity, surfaces in contact (alumina, heatsink) should be coated with a silicone grease (typ e si 340 from rh?ne-poulenc or dow 340 from dow corning). ? the fastening of the resistor to the heatsink is under pressure cont rol of two screws (not supplied). ? in order to improve the dissipation, either fo rced-air cooling or liqui d cooling may be used. ? do not forget to respect an insulation value between two resistors (dielectric strength in dry air 1 kv/mm). choice of the heatsink the user must choose the heatsink according to the workin g conditions of the component (power, room temperature). maximum working temperature must not exceed 125 c. the dissi pated power is simply calculat ed by the following ratio: p: expressed in w ? t: difference between ma ximum working temperature and room temperature r th (j - c) : thermal resistance value measured between re sistive layer and outer side of the resistor. it is the thermal resistance of the component: 0.55 c/w. r th (c - a) : thermal resistance value measured between oute r side of the resistor and room temperature. it is the thermal resistance of the heatsink itself (type, shape) and the quality of the fastening device. example: r th (c - a) for rph 100 power rating 80 w at ambient temperature + 40 c. ? t ? 125 c - 40 c ? 85 c r th (j - c) + r th (c - a) = = = 1.06 c/w r th (c - a) ? 1.06c/w - 0.55 c/w ? 0.51 c/w performance tests conditions requirements short time overload nf en 140 000 cei 115_1 4 pr/5 s u s < 2 u l < (0.25 % + 0.05 ? ) rapid temperature change nf en 140000 cei 68214 test na 5 cycles - 55 c + 125 c < (0.25 % + 0.05 ? ) load life (chassis mounted 0.45 c/w) nf en 140 000 pr at 25 c 1000 h < (0.5 % + 0.05 ? ) humidity (steady state) mil std 202 method 103 b test d 56 days 95 % rh < (0.5 % + 0.05 ? ) resistance value in relation to tolerance and tcr ohmic value < 1 ? > 1 ? standard tolerance 5 % 5 % standard tcr 300 ppm/c 150 ppm/c toleranc on request 1 % to 2 % tightening torque on heatsink rph 100 3 nm p ? t r th (j - c) r th (c - a) + ?? ---------------------------------------------------------- = ? t p ------ - 85 80 ------
rph 100 www.vishay.com vishay sfernice revision: 22-nov-12 3 document number: 50046 for technical questions, contact: sfer@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 overloads in any case the applied volt age must be lower than 2 u n . u max. < 2 u n < 3800 v. short time overload: 4 x pr/10 s accidental overload: the values indicated on the following graph are applicable to resistors in air or mounted onto a heatsink. marking series, style, ohmic value (in ? ), tolerance (in %), manufacturing date, vishay sfernice trademark. energy curve power curve power rating for resistor mounted onto a heatsink with thermal resistance of 0.45 c/w. 0.1 1 10 100 1000 ener g y in joule s overload duration in s 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 100 1000 10 000 100 000 1 000 000 10 000 000 power in w overload duration in s 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 ambient temperature in c rated power in % 80 60 40 20 0 0 20 40 60 80 100 120 140 100
rph 100 www.vishay.com vishay sfernice revision: 22-nov-12 4 document number: 50046 for technical questions, contact: sfer@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 ordering information rph 100 3.3 k ? 5 % v xxx model style resistance value tolerance 1 % 2 % 5 % connections v: m4 screw custom design optional on request: special tcr, shape etc. global part number information global model size leads ohmic value tolerance packaging special rph 100 v = m4 screw the firs t three digits are significant figures and the last digit specifies the number of zeros to follow. r designates decimal point. 48r70 = 48.7 ? 48701 = 48 700 ? 10002 = 100 k ? r0100 = 0.01 ? r6800 = 0.68 ? 27000 = 2700 ? = 2.7 k ? f = 1 % g = 2 % j = 5 % k = 10 % b = box 5 pieces as applicable ex = xxx j b ph100v1 0 r 00
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