document number: 50035 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 31-mar-10 37 rto 50 vishay sfernice 50 w power resistor, thick film technology, to-220 feature ? 50 w at 25 c heatsink mounted ? adjusted by sand trimming ? leaded or surface mount versions ? high power to size ratio ? non inductive element ? compliant to rohs directive 2002/95/ec because of the knowledge and experience in thick film techno logy, 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 side 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. mechanical specifications mechanical protection molded resistive element thick film connections tinned copper alloy weight 2.2 g max. dimensions standard package to-220 insulated case 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 note ? not compatible with rohs reflow profile dimensions in millimeters 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 = durin g surface mount solderin g , the solderin g temperature profile must not cause the metal tab of this device to exceed 220 c. electrical specifications resistance range 0.010 to 550 k serie e24 tolerances standard 1 % to 10 % 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 temperature coefficient standard (- 55 c; + 150 c) see performance table 150 ppm/c limiting element voltage u l 300 v dielectric strength mil std 202 (301) 2000 v rms - 1 min 10 ma max. insulation resistance 10 6 m inductance 0.1 h critical resistance 1.8 k
www.vishay.com for technical questions, contact: sfer@vishay.com document number: 50035 38 revision: 31-mar-10 rto 50 vishay sfernice 50 w power resistor, thick film technology, to-220 choice of the heatsink the user must choose according to the working condit ions of the component (power, room temperature). maximum working temperature must not exceed 155 c. the dissipat ed power is simply calculated by the following ratio: p: expressed in w t: difference between maximum worki ng 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: (special features table) 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 itself (type, shape) and the qual ity 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 p r 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 relati on 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 --------- -
document number: 50035 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 31-mar-10 39 rto 50 50 w power resistor, thi ck film technology, to-220 vishay sfernice overloads the applied voltage must always be lower than the maximum overload voltage of 450 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, vis hay sfernice trademark. 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 tightening should be around 1 nm. 0.01 0.1 1 10 energy curve 10 -6 10 -4 10 -5 10 -3 10 -2 overload duration in s energy in j 10 -7 10 -1 100 packaging tube of 50 units 80 60 40 20 0 rated power in % heatsink temperature in c 0 100 200 50 100 150 25 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. 4 8 r70 = 48.7 4 8 701 = 48 700 10002 = 100 000 r0100 = 0.01 r6 8 00 = 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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