document number: 31018 revision 11-feb-03 www.vishay.com 24 cmf industrial vishay dale for technical questions, contact: ff2bresistors@vishay.com wattage 1/20 1/10 1/8 1/4 1/2 3/4 1 metal film resistors, industrial features ? small size - conformal coated ? flame retardant epoxy coating ? controlled temperature coefficient ? excellent high frequency characteristics ? exceptionally low noise; typically 0.10 v/v ? low voltage coefficient to 5ppm/volt ? special tolerance and or tc matching available on request vishay dale model cmf is also available as military qualified styles rn and rl. see appropriate catalog or web page for the m il-spec ratings/attributes. (except for marking, the industrial and military versions are exactly the same. depending upon stock, mil itary marked parts may be supplied as industrial rated parts.) standard electrical specifications commercial power rating (see performance table) resistance range ? vs - best available tolerance/temperature coefficient **a 0.0005 ? bridge error is allowed in resistance measurement. it has the greatest effect on values in this range and should be taken int o account when verifying tolerance and temperature coefficient. note: the above table summarizes the more common combinations of power rating, case size and ambient operating temperature that preva il in various industrial and military resistor specifications. the performance table in ensuing pages qualifies the load life stab ility under these combinations @ + 70 c cmf-50 cmf-50, -55 cmf-50, -55, -60 cmf-55, -60, -65, -70, -07 cmf-55, -60, -65, -70, -20 cmf-60, -65, -70, -20 cmf-60, -65, -70, -20 @ + 125 c cmf-50 cmf-50, -55 cmf-50, -55, -60, -20 cmf-55, -60, -65, -70, -20 cmf-60, -65, -70, -20 cmf-65, -70 0.1% t-9 10 - 500k 10 - 2.5m 10 - 2.5m 10 - 2.5m 10 - 2.5m v 200 v 250 v 250 v 500 v 500 v 500 v 500 v 2%** t-00 0.1 - 0.49 0.1 - 0.49 0.1 - 0.49 1% t-2 10 - 500k 10 - 5m 10 - 8m 10 - 10m 10 - 10m cmf-50 cmf-70 cmf-55 cmf-07 cmf-60 cmf-20 cmf-65 cmf-55 model t-00 = 200ppm/ c t-0 = 150ppm/ c t-1 = 100ppm/ c t-2 = 50ppm/ c t-9 = 25ppm/ c t-1 temperature*** coefficient ordering information f tolerance first three digits are significant. (two for 2% and 5% tolerance.) last digit specifies the number of zeros to follow. 3010 resistance* value b= 0.1% c= 0.25% d= 0.5% f= 1% g= 2% j= 5% * examples: r27 = 0.27 ohm, 49r9 = 49.9 ohm, 1000 = 100 ohm, 1001 = 1 kilohm, 1004 = 1 megohm, r511 = 0.511 ohm. *** tolerances of 0.5% (d), 0.25% (c) and 0.1% (b) are available only in t-2 and t-9 temperature coefficients. model limiting element voltage max 2%, 5% t-0 C C 1 - 5m C 1 - 8m C C 1% t-0 10 - 1m 0.5 - 22.1m C 0.5 - 8m C 0.5 - 15m 1 - 15m 2%, 5% t-1 C C 5 - 5m C 5 - 8m C C 1% t-1 10 - 1m 1 - 22.1m C 1 - 8m C 1 - 15m 1 - 15m cmf-50 cmf-55 cmf-07 cmf-60 cmf-20 cmf-65 cmf-70
www.vishay.com 25 cmf industrial vishay dale document number: 31018 revision 11-feb-03 for technical questions, contact: ff2bresistors@vishay.com dimensions in inches [millimeters] * available with .032" [.813mm] lead. ** .290" [7.37mm] for 0.25% and 0.1% resistance tolerances and values > 1m ? *** .260" .020" [6.60mm .508mm] for values > 5 m ? . d 0.016 0.002 [0.41 0.05] 0.025 0.002 [0.64 0.05] 0.025 0.002* [0.64 0.05] 0.025 0.002* [0.64 0.05] 0.032 0.002 [0.81 0.05] 0.025 0.002 [0.64 0.05] 0.032 0.002 [0.81 0.05] c (max.) 0.187 [4.75] 0.278 [7.06]** 0.425 [10.80] 0.687 [17.45] 0.687 [17.45] 0.278 [7.06] 0.425 [10.80] b 0.065 0.015 [1.65 0.38] 0.090 0.008 [2.29 0.20] 0.145 0.015 [3.68 0.38] 0.180 0.015 [4.57 0.38] 0.180 0.015 [4.57 0.38] 0.090 0.008 [2.29 0.20] 0.145 0.015 [3.68 0.38] a 0.150 0.020 [3.81 0.51] 0.240 0.020*** [6.10 0.51] 0.344 0.031 [8.74 0.79] 0.562 0.031 [14.27 0.79] 0.562 0.031 [14.27 0.79] 0.240 0.020 [6.10 0.51] 0.375 0.040 [9.53 1.02] model cmf-50 cmf-55 cmf-60 cmf-65 cmf-70 cmf-07 cmf-20 b d c (max.) 1.500 0.125 [38.10 3.18] a metal film resistors, industrial parameter unit cmf-50 cmf-55 cmf-07 cmf-60 cmf-20 cmf-65 cmf-70 maximum working voltage v 200 250 250 500 500 500 500 insulation voltage (1min) v eff >500 voltage coefficient max . 5ppm/volt (measured between 10% and full rated voltage) dielectric strength vac 450 450 450 750 750 900 900 insulation resistance ? 10 11 operating temperature range c - 55 / + 175 terminal strength (pull test) lb 2 2 5 2 5 2 5 noise db 0.10 microvolts/volt over a decade of frequency, with low and intermediate resistance values typically below 0.5 microvolts/v weight (max) g 0.12 0.20 0.20 0.50 0.60 1.00 1.10 technical specifications * 1.08 0.125 [27.43 3.18] if tape and reel
document number: 31018 revision 11-feb-03 www.vishay.com 26 cmf industrial vishay dale for technical questions, contact: ff2bresistors@vishay.com marking value decade and tolerance date code (alternate parts may be mil marked) special modifications 1. terminals may be supplied in any commercial material with several type finishes. 2. special pre-conditioning (power aging, temperature cycling, etc.) to customer specifications. 3. non-helixed resistors can be supplied for critical high frequency applications. 4. fusible, flameproof versions available. metal film resistors, industrial cmf resistors have an operating temperature range of - 55 c to + 175 c. they must be derated at high ambient temperatures according to the derating curve. the increase in resistor surface temperature due to the rated load is shown below. resistor surface temperature = heat rise plus ambient temperature. 1/4 w 1/2 w 3/4 w 1 w 1/8 w 1/4 w 1/2 w 3/4 w 1/8 w 1/10 w 1/4 w 1/2 w cmf-55 cmf-60 cmf-65 cmf-07 cmf-20 cmf-70 heat rise ( c) heat rise -55 -50 -25 0 25 50 70 75 100 125 150 165 175 200 ambient temperature in ? c derating 120 100 80 60 40 20 0 rated power in % element: vacuum-deposited nickel-chrome alloy coating: flame retardant epoxy, formulated for superior moisture protection core: fire-cleaned high purity ceramic solderability: continuous satisfactory coverage when tested in accordance with mil-r-10509 material specifications 0 20 40 60 80 100 1 w
www.vishay.com 27 cmf industrial vishay dale document number: 31018 revision 11-feb-03 for technical questions, contact: ff2bresistors@vishay.com performance power rating @ + 70 c @ + 125 c model cmf-50 1/10 watt 1/8 watt - 1/20 watt 1/10 watt 1/8 watt cmf-55 1/8 watt 1/4 watt 1/2 watt 1/10 watt 1/8 watt 1/4 watt cmf-60 1/4 watt 1/2 watt 3/4 watt & 1 watt 1/8 watt 1/4 watt 1/2 watt cmf-65 1/2 watt 3/4 watt 1 watt 1/4 watt 1/2 watt 3/4 watt cmf-70 1/2 watt 3/4 watt 1 watt 1/4 watt 1/2 watt 3/4 watt cmf-07 C 1/4 watt C C C C cmf-20 C 1/2 watt 1 watt C C C test [test methods - mil-std-202] maximum ? r (typical test lots) short time overload C 0.05% C C 0.05% C low temperature operation C 0.05% C C 0.05% C moisture resistance C 0.05% C C 0.05% C shock C 0.01% C C 0.01% C vibration C 0.004% C C 0.04% C temperature cycling C 0.15% C C 0.15% C load life 0.15% 0.5% 1.0% 0.15% 0.5% 1.0% dielectric withstanding voltage C 0.01% C C 0.01% C effect of solder C 0.03% C C 0.03% C metal film resistors, industrial temperature coefficient temperature code coefficient t-00 0 200ppm/ c t-0 0 150ppm/ c t-1 0 100ppm/ c t-2 0 50ppm/ c t-9 0 25ppm/ c temperature coefficient codes
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