CMF55301R00FKRE70 Datasheet, PDF (3/5 Pages) Vishay Siliconix – Metal Film Resistors, Industrial, Precision

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CMF Industrial
Vishay Dale
TEMPERATURE COEFFICIENT CODES
GLOBAL TC CODE
HISTORICAL TC CODE
E
T-9
H
T-2
K
T-1
L
T-0
N
T-00
TEMPERATURE COEFFICIENT
25 ppm/°C
50 ppm/°C
100 ppm/°C
150 ppm/°C
200 ppm/°C
LOAD LIFE SHIFT DUE TO POWER AND DERATING (AT +70 °C AND AT +125 °C)
The power rating for the CMF parts is tied to the derating temperature, the heat rise of the parts, and the R for the load life performance.
When the tables/graphs below are used together they show that when the parts are run at their higher power ratings, the parts will run hotter,
which has the potential of causing the resistance of the parts to shift more over the life of the part.
LOAD LIFE SHIFT VS. POWER RATING
LOAD LIFE
± 0.15 %
MAXIMUM R (TYPICAL TEST LOTS)
± 0.5 %
± 1.0 %
± 0.15 %
± 0.5 %
± 1.0 %
MODEL
POWER RATING AT +70 °C
POWER RATING AT +125 °C
CMF50
1/20 W and 1/10 W
1/8 W
1/4 W
1/20 W
1/10 W
1/8 W
CMF55, CMF07
1/10 W and 1/8 W
1/4 W
1/2 W
1/10 W
1/8 W
1/4 W
CMF60, CMF20
1/8 W and 1/4 W
1/2 W
3/4 W and 1 W
1/8 W
1/4 W
1/2 W
CMF65
1/4 W and 1/2 W
3/4 W
1W
1/4 W
1/2 W
3/4 W
CMF70
1/4 W and 1/2 W
3/4 W
1W
1/4 W
1/2 W
3/4 W
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.
120
120
CMF50 CMF55,
CMF07
100
100
CMF60,
CMF20
80
80
CMF65,
CMF70
60
60
40
40
20
20
0
- 55 - 50 - 25 0
DERATING
0
0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1 1.125
25 50 70 75 100 125 150 165 175 200
APPLIED POWER IN W
AMBIENT TEMPERATURE IN °C _{THERMAL RESISTANCE}
Example:
When a CMF55 part is run at 1/8 W in a 70 °C ambient environment, the resistor will generate enough heat that the surface temperature of
the part will reach about 19 °C over the ambient temperature, and over the life of the part this could cause the resistance value to shift up to
± 0.15 %.
If the same resistor was instead run at 1/4 W in a 70 °C environment, the element will heat up to about 30 °C over ambient, and over the life
of the part the resistance value could shift roughly ± 0.5 %.
And if the resistor was run at it maximum power rating of 1/2 W in a 70 °C environment, it will heat up to about 58 °C over ambient, and you
could see the resistance value shift roughly ± 1 % over the life of the part.
MATERIAL SPECIFICATIONS
Element
Vacuum-deposited nickel-chrome alloy
Core
Fire-cleaned high purity ceramic
Coating
Solderability
Flame retardant epoxy, formulated for superior
moisture protection
Continuous satisfactory coverage when tested
in accordance with MIL-R-10509
Revision: 09-Sep-13
3
Document Number: 31018
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