rto 50 www.vishay.com vishay sfernice revision: 19-apr-13 1 document number: 50035 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 50 w power resistor, thick film technology, to-220 features ? 50 w at 25 c heatsink mounted ? adjusted by sand trimming ? leaded or surface mount versions ? high power to size ratio ? non inductive element ? material categorization: for definitions of compliance please see www.vishay.com/doc?99912 because of the knowledge and experience in thick film technology, vishay sfernice has been able to develop a high power resistor in a to-220 package called rto 50. the special design of this component allows the dissipation of 50 w when mounted on a heatsink. the ohmic value is adjusted by sand trimming. this process does not generate hot spots as in laser trimming, which could lead to microcracks on each si de of the curve. this process improves the reliability and the stability of the resis tor and at the same time gives a good overload capability. note (1) e24 series note ? not compatible with rohs reflow profile 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 critical resistance ? rto 50 to-220 0.010 to 550k (1) 50 500 1, 2, 5, 10 150 1.8k 4.5 1.3 8.8 ? 0.8 10.1 13.7 12.5 5.08 15 ? 3.6 2.5 rto 50f - leaded 4.5 1.3 8.8 10.1 12.5 5.08 15 ? 3.6 0.3 1.6 3 2 rto 50c - for surface mounting ? only for rto 50 version c = during surface mount soldering, the soldering temperature profile must not cause the metal tab of this device to exceed 220 c. mechanical specifications mechanical protection molded resistive element thick film connections tinned copper alloy weight 2.2 g max. environmental specifications temperature range - 55 c to 155 c climatic category 55/155/156 sealing sealed container, solder immersion flammability iec 60695-11-5, 2 applications 30 s seperated by 60 s technical specifications dissipation and associated onto a heatsink thermal resistance ? and nominal power 50 w at + 25 c r th (j - c) : 2.6 c/w free air: 2.25 w at + 25 c dielectric strength ? mil std 202 (301) 2000 v rms - 1 min 10 ma max. insulation resistance ? 10 6 m ? inductance ? 0.1 h dimensions standard package to-220 insulated case
rto 50 www.vishay.com vishay sfernice revision: 19-apr-13 2 document number: 50035 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 choice of the heatsink the user must choose according to the working condit ions of the component (pow er, room temperature). ? maximum working temperature must not exceed 155 c. the dissipated power is simply calculated by the following ratio: p: expressed in w ? ? t: difference between maximum workin g temperature and room temperature ? r th (j - c) : thermal resistance value measured between resist ive layer and outer side of the resistor. it is ? the thermal resistance of the component: (special features table) ? 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 rto 50 power rating 13 w at ambient temperature + 30 c ? thermal resistance r th (j - c) : 26 c/w ? considering equation (1) we have: ? ? t ? 155 c - 30 c 125 c ? r th (j - c) + r th (c - a) = = = 9.6 c/w ? r th (c - a) ? 9 .6 c/w - 2.6 c/w ? 7 c/w performance tests conditions requirements momentary overload en 60115-1 2 pr 5 s for r < 2 ? 1.6 pr 5 s for r ? 2 ? u s < 1.5 u l (0.25 % + 0.05 ? ) rapid temperature change en 60115-1 60 068-2-14 5 cycles - 55 c to + 155 c (0.5 % + 0.05 ? ) load life en 60115-1 pr at + 25 c, 1000 h cei 115_1 (1 % + 0.05 ? ) humidity (steady state) en 60115-1 56 days rh 95 % (0.5 % + 0.05 ? ) vibration mil std 202 method 204 c test d (0.2 % + 0.05 ? ) terminal strength mil std 202 method 211 test a1 (0.2 % + 0.05 ? ) resistance value in relation to tolerance and tcr resistance values ? 0.01 ? ? 0.015 ? ? 0.1 ? ? 0.5 ? tolerances 1 % at 10 % temperature coefficient ? (- 55 c to + 155 c) standard 900 ppm/c 700 ppm/c 250 ppm/c 150 ppm/c p ? t r th (j - c) r th (c - a) + ?? -------------------------------------------------------------------- - 1 ?? = ? t p ------- 125 13 --------- -
rto 50 www.vishay.com vishay sfernice revision: 19-apr-13 3 document number: 50035 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 voltage must always be lower than the maximum overload voltage of 750 v. ? the values indicated on the graph below are applicable to resistors 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 temperature of the heatsink should be maintained within the limits specified. ? to improve the thermal conductivity, surfaces in contact should be coated with a silicone grease and the torque applied on the screw for tighte ning should be around 1 nm. ? 0.001 0.01 0.1 1 10 100 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 power in w overload duration in s 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 packaging tube of 50 units 80 60 40 20 0 rated power in % heatsink temperature in c 0 100 200 50 100 150 25
rto 50 www.vishay.com vishay sfernice revision: 19-apr-13 4 document number: 50035 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 rto 50 f 100k 1% xxx tu50 e1 model style connections f: radial leads c: surface mount resistance value tolerance 1% 2% 5% 10% custom design optional on request: special tcr, shap, etc. packaging lead (pb)-free global part number information global model size leads ohmic value tolerance packaging rto 050 f = radial leads c = surface mount 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 ? 48701 = 48 700 ? 10002 = 100 000 ? r0100 = 0.01 ? r6800 = 0.68 ? 27000 = 2700 ? = 2.7 k ? f = 1 % g = 2 % j = 5 % k = 10 % t = tube size 30 and 50: tube 50 pieces 050fr6 8 0t1 t o r 0je
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