document number: 50054 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 27-oct-10 67 lps 800 vishay sfernice power resistor for mounting onto a heatsink thick film technology features ? 800 w at 85 c bottom case temperature ? wide resistance range: 0.3 to 900 k e24 series ? non inductive ? easy mounting ? low thermal radiation of the case ? compliant to rohs directive 2002/95/ec note ? tolerances unless stated: 0.2 mm mechanical specifications mechanical protection insulated case ul 94 v-0 resistive element thick film substrate alumina end connections screws m4 tightening torque - on connections 2 nm - on heatsink 2 nm maximum torque 2.5 nm weight 83 g 10 % environmental specifications temperature range - 55 c to 175 c climatic category 55/175/56 dimensions in millimeter s 2 x m4 useful depth: 8 57 34 60 36 2 x ? 4.2 lps 8 00 i5u 5 % v2 64.7 15.2 21.2 25.2 13.6 ? 20 25. 8 1 electrical specifications resistance range 0.3 to 900 k tolerances (standard) 1 % to 10 % power rating and thermal resistance 800 w at + 85 c bottom case temperature r th (j - c) : 0.112 c/w temperature coefficient r 1 u : 500 ppm/c 1 u < r 10 u : 300 ppm/c 10 u < r : 150 ppm/c - 55 c/175 c iec 60115-1 standard limiting element voltage u l 5 kv dielectric strength iec 60115-1, 1 min, 10 ma max. 7 kv rms or 12 kv rms insulation resistance 10 4 m inductance 0.1 h critical resistance 31.25 k
www.vishay.com for technical questions, contact: sfer@vishay.com document number: 50054 68 revision: 27-oct-10 lps 800 vishay sfernice power resistor for mo unting onto a heatsink thick film technology recommendations for mounting onto a heatsink ? surfaces in contact must be carefully cleaned. ? the heatsink must have an acceptable fl atness: from 0.05 mm to 0.1 mm/100 mm. ? roughness of the heatsink must be around 6.3 m. in order to improve thermal conductivity, surfaces in contact (alumina, heatsink) should be coated with a silicone gr ease (type si 340 from rh?ne-poulenc or dow 340 from dow corning) or a thermal film (type q pad ii) easier and faster to install than the grease. ? the fastening of the resistor to the heatsink is under pressure control of two screws tightened at 2 nm for full power availabi lity. ? the following accessories are supplied with each product: 2 screws chc m4 * 25 class 8.8 and 2 m4 contact lock washers for heatsink mounting, 2 screws th m4 * 6/6 and 2 m4 contact lock washers for connections. choice of the heatsink the user must choose the heatsink according to the working c onditions of the component (power, room temperature). maximum working temperature must not exceed 175 c. the dissipa ted 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 between resistive laye r and outer side of the resistor. it is the thermal resistance of the component: (see sp ecifications environmental paragraph). r th (c - a) : thermal resistance value measured betw een outer side of the resistor and r oom temperature. it is the thermal resistance of the thermal interface, the heatsink (t ype, shape) and the quality of the fastening device. example: r th (c - a) for lps 800 power dissipation 180 w at + 50 c room temperature. t 175 c - 50 c = 125 c r th (j - c) + r th (c - a) = = = 0.69 c/w r th (j - c) = 0.112 c/w r th (c - a) = 0.69 c/w - 0.112 c/w = 0.578 c/w performance tests conditions requirements momentary overload iec 60115-1 1.5 x p r /10 s u max. u l = 5000 v (0.25 % + 0.05 ) rapid temperature change iec 60115-1/iec 60068-2-14 test na 50 cycles - 55 c to + 175 c (0.5 % + 0.05 ) load life iec 60115-1 1000 h (90/30) p r at 85 c (0.5 % + 0.05 ) humidity (steady state) iec 60115-1 56 days rh 95 %/40 c (0.5 % + 0.05 ) vibration mil std 202 method 204 cond. d (10 g ; 5/500 hz) (0.25 % + 0.05 ) climatic sequence iec 60115-1 (55/175/56) (1 % + 0.05 ) tightening torque on heatsink lps 800 2 nm p t r th (j - c) r th (c - a) + [] --------------------------------------------------------- - = t p ------- 125 180 --------- -
document number: 50054 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 27-oct-10 69 lps 800 power resistor for m ounting onto a heatsink thick film technology vishay sfernice overloads in any case the applied voltage must be lower than u l = 5000 v. short time overload: 1.5 x p r /10 s accidental overload: the values indicated on the following graph are applicable to resistors in air or mounted onto a heatsink. energy curve power rating the temperature of the case sh ould be maintained within the limits specified in the following figure. to optimize the thermal conduction, contacting surfaces should be coated with silicone grease or thermal film, and heatsink mounting screws tightened to 2 nm. marking series, style, ohmic value (in ), tolerance (in %), manufacturing date, vis hay sfernice trademark. overload duration in s energy in j 10 000 1000 100 10 1 0.1 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 1 bottom case temperature in c rated dissipation in % 100 8 0 60 40 20 0 0 50 100 150 200 8 5 175 packaging box of 15 units ordering information lps 800 100 k 1 % xxx bo15 e model style 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 dielectric ohmic value tolerance packaging special lps 800 l = dielectric strength 7 kv h = dielectric strength 12 kv the first three digits are significant figures and the last digit specifies the number of zeros to follow. r designates decimal point. 48r7 = 48.7 47r0 = 47 1001 = 1 k 4r70 = 4.7 r240 = 0.24 f = 1 % g = 2 % j = 5 % k = 10 % b = box 15 pieces as applicable zax 800h47r j s 0 p 0b l
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