rps 500 www.vishay.com vishay sfernice revision: 12-dec-14 1 document number: 50047 for technical questions, contact: sferfixedresisto rs@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: 500 w ? high overload capability up to 2 times rated power (see energy curve ? heatsink mounting ? low thermal radiation of the case ? material categorization: fo r definitions of compliance please see www.vishay.com/doc?99912 this range has been developed sp ecifically for electrical traction applications and is capable of dissipating 500 w at +70 c. the remarkable performance characteristics are evident when us ed in severe pulse conditions . the copper base allows easy mounting on the heatsink and provides optimal dissipation conditions. 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 rps 500 500 0.24 to 1m (1) 500 5000 1, 2, 5, 10 150 rps 500d rps 500a 73 56 57 ? 7.2 ? 4.2 2 x m4 useful depth: 6 10.5 26 1 ? 21 60 6 38.1 73 56 57 33.5 ? 7.2 ? 4.2 2 x m4 useful depth: 6 10.5 26 1 ? 21 60 6 35.8 mechanical specifications mechanical protection insulated case and resin for potting ul 94 v-0 resistive element cermet substrate alumina onto base of nickel coated copper end connections screws m4 (m5 on request) weight 250 g 10 % tightening torque on connections 2 nm tightening torque on heatsink 4 nm environmental specifications temperature range -55 c to +125 c flammability iec 60695-11-5 2 applications 30 s separated by 60 s technical specifications rated power ( p 70 ) chassis mounted at 70 c (case temperature) 500 w continuous load thermal resistance of the component r th (j - c) : 0.11 c/w temperature coefficient 300 ppm/c < 1 ? 150 ppm/c > 1 ? dielectric strength l: 7 kv rms - h: 12 kv rms mil std 202 method 301: 1 min/10 ma max. insulation resistance > 10 6 m ? under u ins = 500 v dc iec 60115-1 inductance ? 50 nh
rps 500 www.vishay.com vishay sfernice revision: 12-dec-14 2 document number: 50047 for technical questions, contact: sferfixedresisto rs@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 note (1) resistors are not tested and guaranteed in cycling conditions 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 the rmal conductivity, surface s in contact (alumina, heatsink) are coated with a silicone grease (type sl 340 from rh?ne-poulenc or dow 340 from dow corning). ? the fastening of the resistor to the h eatsink is under pressure control of two screws tightened at 4 nm for full power availability. ? the following accessories are supplied with each produc t: 2 off chc m4 x 16/16 class 8.8 for heatsink mounting, ? 2 off th m4 x 6/ 6 and 2 m4 contact lock washers for connections. choice of the heatsink the user must choose according to the working condit ions of the component (pow er, room temperature). ? maximum working te mperature must not exceed 125 c. ? the dissipated power is simply cal culated 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 resistive la yer and outer side of the re sistor. it is the thermal resistance of the co mponent: 0.11 c/w. r th (c - h) : thermal resistance value measured betwee n outer side of the resistor and uppe r side of the heatsink. this is the thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device. r th (h - a) : thermal resistance of the heatsink. performance tests conditions requirements momentary overload en 60115-1 2 pr/10 s u l = 5000 v < (0.25 % + 0.05 ? ) rapid temperature change iec 60115-1/iec60068-2-14 test na 5 cycles -55 c to +125 c < (0.25 % + 0.05 ? ) load life iec 60115-1 pr (i.e. 500 w)/1000 h/ 70 c (no cycling) (1) < (0.5 % + 0.05 ? ) humidity (steady state) mil std 202 method 103 b and d 56 days 95 % rh/40 c < (0.5 % + 0.05 ? ) resistance value in relation to tolerance and tcr resistance values ?? 1 ?? ?? 1 ?? standard tolerances 5 % standard tcr (- 55 c to + 125 c) 300 ppm/c 150 ppm/c tolerance on request 1 %, 2 %, 10 % tightening torque on heatsink rps 500 4 nm p ? t r th (j - c) ?? r th (c - h) ?? r th (h - a) ?? ++ ----------------------------------------------------------------------------------------------------- =
rps 500 www.vishay.com vishay sfernice revision: 12-dec-14 3 document number: 50047 for technical questions, contact: sferfixedresisto rs@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 short time overload: 2 pr/10 s ? accidental overload: the values indicated in the graph below are applicable to resist ors in air or mounted onto a heatsink. marking model, style, resistance value (in ? ), tolerance (in %), manufacturing date, vishay sfernice trademark. energy curve power curve power rating the heatsink temperature shou ld be maintained at the values specified in fig. 2. ? to optimise the thermal conduction, contacting surfaces should be coated with silicone grease and heatsink mounting screws tightened to 4 nm. overload duration in s 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 0 10 -1 ener g y in joule s 0.1 1 10 100 10 000 1000 power in w overload duration in s 1000 10 000 100 000 1 000 000 10 000 000 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 0 10 -1 packaging box of 15 units rated power in % 0 20 40 60 80 100 120 140 heatsink temperature in c 0 20 40 60 80 100
rps 500 www.vishay.com vishay sfernice revision: 12-dec-14 4 document number: 50047 for technical questions, contact: sferfixedresisto rs@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 rps 500 dh 100 k ? 10 % xxx bo15 e model style connections optional h : dielectric strength 12 kv l : dielectric strength 7 kv resistance value tolerance 1 % 2 % 5 % 10 % custom design optional on request: special tcr, shape etc. packaging lead (pb)-free global part number information global model style dielectric ohmic value tolerance packaging special rps500 d = diagonal connections a = straight connections h : dielectric strength 12 kv l : dielectric strength 7 kv the first four digits are significant figures and the last digit specifies the number of zeros to follow. r designates decimal point. 48r70 = 48.7 ? 47r0 = 47 ? 1001 = 1 k ? 4r70 = 4.7 ? r240 = 0.24 ? f = 1 % g = 2 % j = 5 % k = 10 % b = box 15 pieces n = box 15 pieces n/a (1 to 14 pieces by box) as applicable zax. 0500dh4 r j p s r 70b
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