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CMF Industrial

www.vishay.com

TEMPERATURE COEFFICIENT CODES

Vishay Dale

GLOBAL TC CODE

HISTORICAL TC CODE

T-9

T-2

T-1

T-0

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 %

± 0.5 %

MAXIMUM ? R (TYPICAL TEST LOTS)

± 1.0 % ± 0.15 %

± 0.5 %

± 1.0 %

MODEL

POWER RATING AT +70 °C

POWER RATING AT +125 °C

CMF50

CMF55, CMF07

CMF60, CMF20

CMF65

CMF70

1/20 W and 1/10 W

1/10 W and 1/8 W

1/8 W and 1/4 W

1/4 W and 1/2 W

1/8 W

1/4 W

1/2 W

3/4 W

1/4 W

1/2 W

3/4 W and 1 W

1/20 W

1/10 W

1/8 W

1/4 W

1/10 W

1/8 W

1/4 W

1/2 W

1/8 W

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

CMF50

CMF55,

CMF07

100

CMF60,

CMF20

CMF65,

CMF70

- 55 - 50 - 25

DERATING

70 75 100 125 150 165 175 200

AMBIENT TEMPERATURE IN °C

0 0.125 0.25 0.375 0.5

THERMAL RESISTANCE

0.625

0.75 0.875 1 1.125

APPLIED POWER IN W

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

Core

Revision: 09-Sep-13

Vacuum-deposited nickel-chrome alloy

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

Document Number: 31018

For technical questions, contact: ff2aresistors@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

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