CMF Industrial
Vishay Dale
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 µV/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 MIL-SPEC
ratings/attributes. (Except for marking, the Industrial and Military versions are exactly the same. Depending upon stock, military marked parts
may be supplied as industrial rated parts.)
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
RESISTANCE RANGE Ω
VS - BEST AVAILABLE TOLERANCE/TEMPERATURE COEFFICIENT
± 2%, 5%
± 2%, 5%
± 1%
± 1%
± 1%
T-0
T-1
T-2
T-0
T-1
LIMITING ELEMENT
VOLTAGE
MAX
VƆ
± 2%**
CMF-50
200 V
—
10 - 1M
CMF-55
250 V
0.1 - 0.49
CMF-07
250 V
CMF-60
500 V
CMF-20
500 V
CMF-65
500 V
CMF-70
500 V
—
T-00
± 0.1%
T-9
–
10 - 1M
–
10 - 500k
10 - 500k
0.5 - 22.1M
–
1 - 22.1M
–
10 - 5M
10 - 2.5M
—
–
1 - 5M
–
5 - 5M
—
—
0.1 - 0.49
0.5 - 8M
–
1 - 8M
–
10 - 8M
10 - 2.5M
—
–
1 - 8M
–
5 - 8M
—
—
0.1 - 0.49
0.5 - 15M
–
1 - 15M
–
10 - 10M
10 - 2.5M
1 - 15M
–
1 - 15M
–
10 - 10M
10 - 2.5M
**A 0.0005Ω bridge error is allowed in resistance measurement. It has the greatest effect on values in this range and should be taken into
account when verifying tolerance and Temperature Coefficient.
COMMERCIAL POWER RATING (See Performance Table)
@ + 125°C
@ + 70°C
WATTAGE
1/20
CMF-50
CMF-50
1/10
CMF-50, -55
CMF-50, -55
1/8
CMF-50, -55, -60
CMF-50, -55, -60, -20
1/4
CMF-55, -60, -65, -70, -07
CMF-55, -60, -65, -70, -20
1/2
CMF-55, -60, -65, -70, -20
CMF-60, -65, -70, -20
3/4
CMF-60, -65, -70, -20
CMF-65, -70
1
CMF-60, -65, -70, -20
—
Note: The above table summarizes the more common combinations of power rating, case size and ambient operating temperature that prevail in
various Industrial and Military resistor specifications. The “performance” table in ensuing pages qualifies the load life stability under these
combinations
ORDERING INFORMATION
CMF-55
MODEL
CMF-50 CMF-70
CMF-55 CMF-07
CMF-60 CMF-20
CMF-65
3010
RESISTANCE* VALUE
First three digits are significant.
(Two for ± 2% and ± 5% tolerance.)
Last digit specifies the number of
zeros to follow.
F
TOLERANCE
B = ± 0.1%
C = ± 0.25%
D = ± 0.5%
F = ± 1%
G= ± 2%
J = ± 5%
T-1
TEMPERATURE***
COEFFICIENT
T-00 = ± 200ppm/°C
T-0 = ± 150ppm/°C
T-1 = ± 100ppm/°C
T-2 = ± 50ppm/°C
T-9 = ± 25ppm/°C
* 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.
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24
For Technical Questions, contact: ff2bresistors@vishay.com
Document Number: 31018
Revision 11-Feb-03
CMF Industrial
Vishay Dale
Metal Film Resistors, Industrial
120
The increase in resistor surface temperature due to the rated load
is shown below.
Resistor surface temperature = heat rise plus ambient
temperature.
100
HEAT RISE (°C)
RATED POWER IN %
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.
100
80
60
1W
80
1W
60
3/4 W
1/2 W
40
1/4 W
20
1/8 W
1/10 W
20
0
0
-55 -50 -25
DERATING
0
25
3/4 W
1/2 W
40
1/2 W
1/4 W
1/8 W 1/4 W
CMF-55 CMF-60 CMF-65
CMF-07 CMF-20 CMF-70
50 70 75 100 125 150 165 175 200
AMBIENT TEMPERATURE IN ˚C
HEAT RISE
MATERIAL SPECIFICATIONS
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
SPECIAL MODIFICATIONS
MARKING
1. Terminals may be supplied in any commercial material with
several type finishes.
— Value
2. Special pre-conditioning (power aging, temperature cycling, etc.)
to customer specifications.
3. Non-helixed resistors can be supplied for critical high frequency
applications.
— Decade and Tolerance
— Date code
(Alternate parts may be MIL marked)
4. Fusible, flameproof versions available.
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26
For Technical Questions, contact: ff2bresistors@vishay.com
Document Number: 31018
Revision 11-Feb-03
