rtop www.vishay.com vishay sfernice revision: 29-nov-12 1 document number: 50045 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 resistors for mounting onto a heatsink thick film technology features ? 1 % tolerance available ? high power rating = 200 w ? wide ohmic value range = 0.046 ? to 1 m ? ?non inductive ? easy mounting ? low thermal radiation of the case ? standard isotop case (sot-227 b) ? material categorization: for definitions of compliance please see www.vishay.com/doc?99912 this series of thick film power resistors include modules which can inco rporate up to 2 different re sistor values in the same sot-227b package. two types of termination s are available along with a 4 terminal device for measurement applications in the case of the single resistor vers ion. this product range benefits from vishay sfernices experience in thick film power resistor technology i.e. high power: vo lume ratio, low tolerance or in dividual resistors and excellent overload capabilities (due to the trimming technique). note ? tolerances unless otherwise specified: 0.3 mm dimensions in millimeters standard electrical specifications model size resistance range ? rated power p 25 c w tolerance % temperature coefficient ppm/c drtop50 rtop100 drtop100 rtop200 sot-227b 0.092 to 1m 50 1, 2, 5, 10 150, 300 0.046 to 1m 100 1, 2, 5, 10 150, 300 0.046 to 1m 200 1, 2, 5, 10 150, 300 12.6 10 4 15 0.3 30 38 12.6 25 ? 4.2 v connections rtop mechanical specifications mechanical protection insulated case resistive element cermet substrate alumina on insulated base end connections v connections: screw m4 x 6 tightening torque connections 1 nm tightening torq ue heatsink 2 nm weight 30 g max. environmental specifications temperature range - 55 c to + 125 c climatic category 55/125/56 technical specifications temperature coefficient (- 55 c to + 125 c) standard 300 ppm/c ( r < 1) 150 ppm/c ( r > 1) insulation resistance > 10 6 m ?
rtop www.vishay.com vishay sfernice revision: 29-nov-12 2 document number: 50045 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 note (1) mil-std-202 method 301 performance tests conditions requirements momentary overload iec 60115-1 2.5 pr/5 s u s < 2 u l < (0.25 % + 0.05 ? ) rapid temperature change iec 60115-1 5 cycles - 55 c + 125 c < (0.25 % + 0.05 ? ) load life iec 60115-1 pr at 25 c 1000 h < (0.5 % + 0.05 ? ) humidity (steady state) iec 60115-1/iec 60068-2-3 test ca 56 days 95 % rh/40 c < (0.5 % + 0.05 ? ) special features model rtop 200 rtop 100 drtop 100 drtop 50 power rating at + 25 c chassis mounted resistors unmounted resistors 200 w 5 w 100 w 5 w 100 w 3.5 w 50 w 3.5 w thermal resistance (per resistor) 0.5 c/w 1 c/w 0.5 c/w 1 c/w limiting voltage u l 1500 v 1500 v 500 v 500 v dielectric strength (1) connections/chassis 2500 v, 1 min 10 ma max. 2500 v, 1 min 10 ma max. 2500 v, 1 min 10 ma max. 2500 v, 1 min 10 ma max. dielectric strength (1) connections/resistors - - 2500 v, 1 min 10 ma max. 2500 v, 1 min 10 ma max. ohmic value range 0.046 ? to 1 m ? 0.092 ? to 1 m ? tolerance 1 % to 10 % 1 % to 10 % electrical diagrams r r shunt version r2 r1
rtop www.vishay.com vishay sfernice revision: 29-nov-12 3 document number: 50045 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). ? for the electrical connections, it is recommended to use m4 x 6 screws and if necessary a washer of 1mm thickness. the recommended scre w tightening torque is 1 nm. 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 dissipa ted power is simply calculated by the following ratio: p: expressed in w ? t: difference between maxi mum working temperature and room temperature. r th (j - c) : thermal resistance value measured be tween resistive layer and outer side of the resistor. it is the thermal resistance of the component (see table special features). r th (c - a) : thermal resistance value measured between outer side of the resistor and room temperature. it is the thermal resistance of the heatsink depending on the heatsink itse lf (type, shape) and the quality of the fastening device. example: r th (c - a) : for rtop 200 power rating 130 w at ambient temperature + 30 c. thermal resistance (see table 1) r th (j - c) : 0.5 c/w tightening torque on heatsink rtop 2 nm p ? t r th (j - c) ?? r th (c - a) ?? + --------------------------------------------------------------- = ? t 125 c - 30 c - 95 c ?? r th (j - c) r th (c - a) ? t p ------ - 95 130 --------- - 0.73 c/w == = + r th (j - c) 0.5 c/w ? r th (c - a) 0.73 c/w - 0.5 c/w 0.23 c/w ??
rtop www.vishay.com vishay sfernice revision: 29-nov-12 4 document number: 50045 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 the applied power is 2.5 x ra ted power for 5 s with a max. voltage of 2 x nominal voltage. accidental overload: the values indicated in the graph below are applicable to resist ors in air or mounted onto a heatsink. in case of multi-resistor devi ces, (drtop, trop and qrop) the results apply to each re sistor value in the device. energy curve power curve marking series, style, ohmic value (in), tolerance (in %), manufacturing date, vishay sfernice trademark. power rating the temperature of the heater should be maintained in the limit specified. to improve the thermal conductivity, surfaces in contact should be laid on with a silicon grease and the torque applied on the sc rew for tightening should be around 2 nm. 0.01 0.1 1 10 100 1000 ener g y in joule s overload duration in s rtop drtop 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 100 1000 10 000 100 000 1 000 000 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 power in w overload duration in s rtop drtop packaging box of 10 units 0 20 40 60 80 100 120 140 0 20 40 60 80 100 rated power in % heatsink temperature in c
rtop www.vishay.com vishay sfernice revision: 29-nov-12 5 document number: 50045 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 rtop 200 5u 1 % % v drtop 50 150u 5 % 15u 5 % v xxx bo10 e r1 t1 r2 model style ohmic value absolute tolerance per resistor connections custom design packaging lead (pb)-free rtop drtop 100 50 optional 1 % 2 % 5 % 10 % to be precise for each resistor v: screw vs: rtop shunt optional global part number information global model size leads ohmic value tolerance packaging special rtop 100 200 v = screw vs = rtop shunt the first thre e digits are significant figures and the last digit specifies the number of zeros to follow. r designates decimal point. 48r7 = 48.7 ? 4871 = 4870 ? 1002 = 10 000 ? r010 = 0.01 ? r680 = 0.68 ? 2701 = 2.7 k ? f = 1 % g = 2 % j = 5 % k = 10 % b = box 10 pieces as applicable ex = ua1 k b op100v5 0 r t r0
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