rto 20 www.vishay.com vishay sfernice revision: 19-apr-13 1 document number: 50005 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 20 w power resistor, thick film technology, to-220 the well known to-220 package is compact and easy to mount. features ? 20 w at 25 c heatsink mounted ? high power dissipation to size ratio ? wide resistance range from 0.01 ? to 550 k ? ? negligible inductance ? easy mounting ? to-220 package: compact and easy to mount ? material categorization: for definitions of compliance please see www.vishay.com/doc?99912 two versions of this thick film resistor are available: ? a radial leaded version for pcb mounting ? a flat lead version for surface mounting note ? tolerances unless stated: 0.4 mm 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 20 to-220 0.010 to 550k (1) 20 500 1, 2, 5, 10 150 3.12k rto 20f - leaded 4.5 1.3 8.8 ? 0.8 10.1 13.7 12.5 5.08 15 ? 3.6 2.5 rto 20c - for surface mounting 4.5 1.3 8.8 10.1 12.5 5.08 15 ? 3.6 0.3 1.6 3 2 ? only for rto 20 version c = during surface mount soldering temperature profile must not cause the metal tab of this device to exceed 220 c. mechanical specifications mechanical protection insulated case resistive element thick film substrate alumina onto base of nickel coated copper connections tinned copper weight 2.2 g max. environmental specifications temperature range - 55 c to 155 c climatic category 55/155/56 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 20 w at + 25 c r th (j - c) : 6.5 c/w free air: 2 w at + 25 c dielectric strength mil std 202 2000 v rms - 1 min - 10 ma max. (between terminals and heatsink) insulation resistance ? 10 6 m ? inductance ? 0.1 h dimensions standard package to-220 insulated case
rto 20 www.vishay.com vishay sfernice revision: 19-apr-13 2 document number: 50005 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 ? for very low ohmic values, tcr for information choice of the board the user must choose the board according to the working conditions of the component (power, room temperature). ? maximum working temperatu re must not exeed 155 c. the dissipated powe r 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 resistive la yer and outer side of the re sistor. it is the thermal resistance of the component: special features table. r th (c - a) : thermal resistance value measured be tween outer side of the resistor and room tempera ture. 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 20 power rating 10 w at ambient temperature + 25 c ? thermal resistance r th (j - c) : 6.5 c/w ? considering equation (1) we have: ? t = 155 c - 25 c = 130 c ? ? r th (j - c) + r th (c - a) = = = 13 c/w ? ? r th (c - a) = 13 c/w - 6.5 c/w = 6.5 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 % + 0.005 ? ) rapid temperature change en 60115-1/60068-2-14 5 cycles - 55 c to + 155 c (0.5 % + 0.005 ? ) load life en 60115-1 1000 h pr at + 25 c (1 % + 0.005 ? ) humidity (steady state) en 60115-1 56 days rh 95 % (0.5 % + 0.005 ? ) high temperature exposure nf en 140 000 1000 h - 40 % pr at + 100 c (0.5 % + 0.005 ? ) vibration mil std 202, method 204 c test d (0.2 % + 0.005 ? ) terminal strength mil std 202, method 211 test a1 (0.2 % + 0.005 ? ) shock iec 60115-1 iec 60068-2-27 saw tooth: 100 g /6 ms (0.5 % + 0.005 ? ) resistance value in relation to tolerance and tcr resistance values ? 0.01 ? 0.015 ? 0.1 ? 0.5 tolerances 1 % at 10 % typical temperature coefficient range ? (- 55 c to + 155 c) 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 ------- 130 10 ---------- -
rto 20 www.vishay.com vishay sfernice revision: 19-apr-13 3 document number: 50005 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 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. spring clip can also be used to mount the component on an heatsink (ex: kunze, clip ku4-498). 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 0 100 75 50 25 0 rated power in % heatsink temperature in c 20 40 60 80 100 120 140 155 120
rto 20 www.vishay.com vishay sfernice revision: 19-apr-13 4 document number: 50005 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 20 f u68 5 % xxx tu50 e3 model style connections f : radial leads c : surface mount 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 rto 020 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 020fr6 8 0t3 t o r 0je
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