for technical questions, contact sfer@vishay.com document number: 50049 revision 30-may-06 www.vishay.com 14 lto 30 vishay sfernice resistance range 0.010 to 550 k tolerances (standard) 1 % to 10 % dissipation and associated onto a heatsink power rating 30 w at + 25 c (case temperature) and thermal resistance r th (j-c): 4.2 c/w of the component free air: 2.25 w at + 25 c temperature coef cient see performance table standard 150 ppm/c limiting element voltage 250 v dielectric strength 1500 v rms - 1 minute - 10 ma max. mil std 202 insulation resistance 10 4 m inductance 0.1 h critical resistance 2.08 k electrical specifications 30 watt power resistor thick film technology features ? 30 watt at 25 c case temperature heatsink mounted ? direct mounting ceramic on heatsink ? broad resistance range: r010 to 550k ? non inductive ? to-220 package: compact and easy to mount ? rohs compliant ? isolated case ? tolerance unless otherwise speci ed: ?0.3 mm dimensions in millimeters mechanical specifications mechanical protection molded resistive element thick film substrate alumina connections tinned copper weight 2 g max. mounting torque 1n-m dimensions standard package to-220 isolated case environmental specifications temperature range - 55 c to + 150 c climatic category 55/155/56 3.2 16.2 10.4 1.8 5.08 0.6 3.5 1.3 0.8 12.7 3.2 3.2 lto series are the extension of rto types. we used the direct ceramic mounting design (no metal tab) of our rch power resistors applied to semiconductor packages. rohs compliant
for technical questions, contact sfer@vishay.com www.vishay.com 15 lto 30 vishay sfernice document number: 50049 revision 30-may-06 tests conditions typical drifts momentary overload en 60115-1 (0.5 % + 0.005 ) 1.5 pr/5 s us < 1.5 ul en 60115-1 rapid temperature change ierc 60068-2-14 tests na 5 cycles (0.5 % + 0.005 ) - 55 c to + 155 c load life en 60115-1 (1 % + 0.005 ) 1000 h pr at + 25 c humidity (steady state) mil std 202 (0.5 % + 0.005 ) method 103 b cond. d vibration mil std 202 (0.2 % + 0.005 ) method 204 cond. d terminal strength mil std 202 (0.2 % + 0.005 ) method 211 cond. a1 shock 100g, mil std 202 (0.5 % + 0.005 ) method 213 cond. i performance 30 watt power resistor thick film technology resistance values 0.010 0.015 0.1 0.5 tolerances 1 % at 10 % 900 ppm/c 700 ppm/c 250 ppm/c 150 ppm/c special features typical temperature coef cient (- 55 ?/+ 155 ?) p: expressed in w t: difference between maximum working temperature and room temperature. r th: (j-c): thermal resistance value measured between resistive layer and outer side of the resistor. it is the thermal resistance of the component. 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), the quality of the fastening device, and the thermal resistance of th e thermal compound. example: r th: (c-a) for LTO30 power rating 10 w at ambient temperature + 30 c. thermal resistance r th (j-c): 4.2 c/w considering equation (1) we have: t = 155 c - 30 c = 125 c r th (j-c) + r th (c-a) = = = 12.5 c/w r th (c-a) = 12.5 c/w - 4.2 c/w = 8.3 c/w with a thermal grease r th (c - h) = 1 c/w, we need a heat sink with r th (h - a) = 7.3 c/w choice of the heatsink the user must choose according to the working conditions of the component (power, room temperature). maximum working temperature must not exceed 155 c. the dissipated power is simply calculated by the following ratio: p = t [r th (j-c) + r th (c-a)] t p 125 10 (1)
for technical questions, contact sfer@vishay.com document number: 50049 revision 30-may-06 www.vishay.com 16 lto 30 vishay sfernice
ordering information lto 30 f 100 k ?1 % xxx tu50 e3 model style connections resistance value tolerance custom design packaging lead (pb)-free 1 % optional 2 % on request: 5 % special tcr, 10 % shape etc. 30 watt power resistor thick film technology packaging tube of 50 units overloads in any case the applied voltage must be lower than the maximum overload voltage of 375 v. the values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink. power rating chart the temperature of the case should be maintained within the limits speci? ed. 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. 10 -6 10 -5 10 -4 10 -3 10 -2 energy in joules overload duration in seconds energy curve 0 20 40 60 80 100 120 140 155 100 75 50 25 0 % rated power case temperature in degrees celsius 0.01 0.1 1 10 marking model, style, resistance value (in ), tolerance (in %), manufacturing date, vishay trademark. sap part number lto030f10002fte3 sap part numbering guidelines l t o 0 3 0 f 1 0 0 0 2 f t e 3
legal disclaimer notice vishay document number: 91000 www.vishay.com revision: 08-apr-05 1 notice specifications of the products displayed herein are subjec t to change without notice. vishay intertechnology, inc., or anyone on its behalf, assume s no responsibility or liability fo r any errors or inaccuracies. information contained herein is intended to provide a product description only. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in vishay's terms and conditions of sale for such products, vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and /or use of vishay products including liab ility or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyrigh t, or other intellectual property right. the products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify vishay for any damages resulting from such improper use or sale.
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