for technical questions, contact: sfer@vishay.com document number: 50051 revision: 26-mar-07 www.vishay.com 14 lto 100 vishay sfernice resistance range 0.015 ? to 1 m ? tolerances (standard) 1 % to 10 % dissipation and associated onto a heatsink power rating 100 w at + 25 c (case temperature) and thermal resistance r th (j-c): 1.5 c/w of the component free air: 3.5 w at + 25 c temperature coeffcient see performance table standard 150 ppm/c limiting element voltage 375 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 1.41 k ? electrical specifications power resistor thick film technology features ? 100 watt at 25 c case temperature heatsink mounted ? direct mounting ceramic on heatsink ? broad resistance range: r015 to 1m ? non inductive ? to-247 package: compact and easy to mount ? rohs compliant ? tolerance unless otherwise specifed: 0.3 mm dimensions in millimeters mechanical s pecifications mechanical protection molded resistive element thick film substrate alumina connections tinned copper weight 3.5 g max. mounting torque 1n-m dimensions standard package to-247 isolated case e nvironmental s pecifications temperature range - 55 c to + 175 c climatic category 55/155/56 5.0 20.7 15.76 2.4 10.16 0.6 3.5 3.6 1.5 14.5 ?3.6 5.33 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 100 vishay sfernice document number: 50051 revision: 26-mar-07 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 iec 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 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 coeffcient (- 55 c/+ 150 c) 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 the thermal compound. example: r th: (c-a) for LTO100 power rating 10 w at ambient temperature + 25 c. thermal resistance r th (j-c): 1.5 c/w considering equation (1) we have: ? t = 175 c - 25 c = 150 c r th (j-c) + r th (c-a) = = = 15 c/w r th (c-a) = 15 c/w - 1.5 c/w = 13.5 c/w with a thermal grease r th (c - h) = 1 c/w, we need a heat sink with r th (h - a) = 12.5 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 175 c. the dissipated power is simply calculated by the following ratio: p = ? t [r th (j-c) + r th (c-a)] ? t p 150 10 (1)
for technical questions, contact: sfer@vishay.com document number: 50051 revision: 26-mar-07 www.vishay.com 16 lto 100 vishay sfernice ordering information power resistor thick film technology overloads in any case the applied voltage must be lower than the maximum overload voltage of 560v. the values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink. power ratin g chart the temperature of the case should be maintained within the limits specifed. 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 1n-m . 10 -6 10 -5 10 -4 10 -3 10 -2 energy in joules overload duration in seconds energy curve 0 20 40 60 80 100 120 140 160 175 100 75 50 25 0 % r ated power h eatsink 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 LTO100f10002fte3 sap pa rt numbering guidelines mode l s tyle connections resist anc e va lu e l t o 1 1 0 0 2 to l f 0 0 f 0 pack t lead (pb)-free e 3 lto 100 f 100 k ? 1 % xxx tu30 e3 model style connections resistance value tolerance custom design packaging lead free 1 % optional 2 % on request: 5 % special tcr, 10 % shape etc. pac kaging tube of 30 units
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