document number: 50010 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 16-feb-10 95 rmb, rmbs vishay sfernice molded precision wirewound resistors axial leads features ? 0.75 w to 3 w at 25 c ? nf c 83-210 ? cecc 40201-005 ? low temperature coefficient 50 ppm/c ? low ohmic values 15 m available ? excellent behavior against humidity ? electrical insulation ? mechanical strength ? accurate sizes ? termination = sn/ag/cu or pure matte tin according to the ohmic value ? compliant to rohs directive 2002/95/ec high stability and low temperature coefficient are the main feat ures of the precision wirewoun d resistors type rmb rmbs models just as maintenance parts. their performances can be compared wit h those of the best film resistors but they have in addition a greater power rating. rmbs styles meet the more severe requ irements of nf c 83-210 (all rmbs styles are approved) and characteristic u of mil-r-26 e (approximate size of rw 70 and 79 resistors) specifications. the two models rmb and rmbs have a similar construction. rmbs are submitted, in addition to a process which further incr eases the stability. on request, non-inductive resistors are available under the reference rmb ni. note ? undergoes european qualit y insurance system (cecc) dimensions in millimeters series and style a max. ? b max. e 0.1 weight g rmb0.75 rmbs0.5 7 2.5 0.6 0.3 rmb1.5 rmbs1 10.2 4 0.6 0.7 rmb3 rmbs2 16.2 6.4 0.8 1.5 25 min. 25 min. a ? b ? e technical specifications vishay sfernice series and style rmb0.75 rmb1.5 rmb3 rmbs0.5 rmbs1 rmbs 2 nf c 83-210 ---rp1rp2rp3 cecc 40201-005 --- a bc power rating at 25 c 0.75 w 1.5 w 3 w 0.5 w 1 w 2 w at 70 c 0.6 w 1.2 w 2.4 w 0.4 w 0.8 w 1.6 w ohmic range in relation to tolerance 5 % e24 0.1 to 2 k 0.1 to 6.81 k 0.051 to 13 k 0.1 to 2 k 0.1 to 6.81 k 0.015 to 13 k 2 % e48 0.1 to 2 k 0.1 to 6.81 k 0.08 to 12.3 k 0.1 to 2 k 0.1 to 6.81 k 0.078 to 12.4 k 1 % e96 0.1 to 2 k 0.1 to 6.81 k 0.1 to 12.4 k 0.1 to 2 k 0.1 to 6.81 k 0.1 to 12.4 k 0.5 % e96 0.4 to 2 k 0.4 to 6.81 k 0.3 to 12.4 k 0.4 to 2 k 0.4 to 6.81 k 0.3 to 12.4 k 0.1 % please consult vishay sfernice qualified ohmic range nf c 83-210 --- 1 to 174 1 to 590 1 to 1.3 k limiting element voltage not applicable 120 v 200 v not applicable 120 v 200 v critical resistance out of nominal ohmic range
www.vishay.com for technical questions, contact: sfer@vishay.com document number: 50010 96 revision: 16-feb-10 rmb, rmbs vishay sfernice molded precision wirewound resistors axial leads stability and power rating stability changes slightly according to power rating and ambient temperature. this fact is specially important for users needin g a life drift lower than the initial resistance tolerance. typica l drifts, after 2000 h life test made under the 90?/30? conditi ons and at a 25 c ambient temperature are: performance tests conditions requirements typical values and drifts mil-r-26 e nf c 83-210 rmb rmbs dielectric w/s voltage 500 v rms (0.1 % + 0.05 ) - (0.05 % + 0.01 ) (0.05 % + 0.01 ) short time overload 5 p n at 25 c/5 s (0.2 % + 0.05 ) 0.25 % + 0.05 (0.1 % + 0.01 ) (0.05 % + 0.01 ) climatic sequence nf c 83-210 - 55 c/+ 200 c 5 cycles - 0.25 % + 005 insulation r > 100 m (0.1 % + 0.01 ) > 10 4 m (0.05 % + 0.01 ) > 10 4 m humidity (steady state) nf c 83-210 56 days 95 % rh - 0.25 % + 0.05 insulation r > 100 m (0.1 % + 0.01 ) > 10 4 m (0.05 % + 0.01 ) > 10 4 m thermal shock load at 100 % p followed by cold temp. exposure at - 55 c (0.2 % + 0.05 ) - (0.2 % + 0.01 ) (0.1 % + 0.01 ) vibration mil-std-202 method 204 - test d: 20 g 10/2000 hz (0.2 % + 0.05 ) 0.25 % + 0.05 (0.01 % + 0.01 ) (0.01 % + 0.01 ) load life mil-std-202 method 108 pr 2000 h (0.5 % + 0.05 ) 0.25 % + 0.05 1000 h at 25 c (1 % + 0.01 ) (0.15 % + 0.01 ) moisture resistance mil-std-202 method 106 (0.2 % + 0.05 ) insulation resistance > 100 m - (0.1 % + 0.01 ) > 10 3 m (0.05 % + 0.01 ) > 10 3 m high temperature 1000 h at + 200 c (0.5 % + 0.05 ) 0.5 % + 0.05 insulation r > 1 g 1 % 0.3 % shock mil-std-202 100 g method 205 test c (0.1 % + 0.05 ) 0.25 % + 0.05 0.05 % 0.05 % temperature coefficient in the range - 55 c to + 200 c ohmic range requirements nf c 83-210 mil-r-26e typical values sfernice mil r n < 1 100 ppm/c 50 ppm/c 1 r n < 10 50 ppm/c r n 10 25 ppm/c + 0 c to - 20 ppm/c model style rmbs 0.5 rmbs 1 rmbs 2 r %/ r % model style rmb 0.75 rmb 1.5 rmb 3 r %/ r % p n 0.5 w 1 w 2 w 0.15 % p max. 1 w 2 w 3.5 w 1 % 1/2 p n 0.25 w 0.5 w 1 w 0.075 % p n 0.75 w 1.5 w 3 w 0.5 % 1/3 p n 0.4 w 0.75 w 1.5 w 0.3 %
rmb, rmbs molded precision wirewound resistors axial leads vishay sfernice document number: 50010 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 16-feb-10 97 power rating temperature rise marking vishay sfernice trademark, model, style, cecc style (if applicable) nominal resistance (in ), tolerance (in %), manufacturing date. ambient temperature in c 125 100 75 50 37 25 0 0 50 100 150 200 250 275 300 350 rated power in % rated power in w 250 200 150 100 50 0 0 1 2 3 hot spot temperature inc rmb0 .75 rmb s0. 5 rmb1. 5 rmbs1 rmb3 rmb s2 ordering information rmb 105 r5000 j s00 rmbs 05 22r00 j s14 model style ohmic value tolerance packaging global part number information global model size option ohmic value tolerance packaging special rmb rmbs rmb: 075 105 300 rmbs: 05 10 20 n = non inductive winding the first four digits are significant figures and the last digit specifies the number of zeros to follow. r designates decimal point. 300r0 = 300 680r0 = 680 20301 = 20.3 k 88r88 = 88.88 ... f = 1 % j = 5 % standard packaging: rmb: size 075 and 105: s14 = bag, 100 pieces size 300: s09 = bag, 50 pieces rmbs: size 05 and 10: s14 = bag, 100 pieces size 20: s09 = bag, 50 pieces other packagings available as applicable ex = mex 05300r0 s b 1 m j0 0 r
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