CMF Industrial

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Vishay Dale

Revision: 07-May-2024

3

Document Number: 31018

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LOAD LIFE SHIFT DUE TO POWER AND DERATING AT +70 °C

The power rating for the CMF parts is tied to the derating temperature, the heat rise of the parts, and the

ΔR 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

MAXIMUM

ΔR (TYPICAL TEST LOTS)

± 0.15 %

± 0.5 %

± 1.0 %

MODEL

POWER RATING AT +70 °C

CMF50

1/10 W

1/8 W

1/4 W

CMF55, CMF07

1/8 W

1/4 W

1/2 W

CMF60, CMF20

1/4 W

1/2 W

1 W

CMF resistors have an operating temperature range of -55 °C to +125 °C. They must be derated at high ambient temperatures according to

the derating curve.

DERATING

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 JSTD-002

MARKING

Temperature coefficient: T00 = 200 ppm, T0 = 150 ppm, T1 = 100 ppm, T2 = 50 ppm, T9 = 25 ppm, M = 300 ppm

CMF50: (2 lines)

CMF55, CMF60, CMF65, CMF70: (4 lines)

3.01

Value

DALE

Manufacturer’s name

K 1 %

Ohm, K or M sign and tolerance

CMF55

Style and size

49.9 k

Ω

Value

1 % T2

Tolerance and TC

10

100

1000

10000

0

20

40

60

80

100

120

-55 -50

-25

0

25

50

100

150

165

200

175

Axis Title

Ambient Temperature (°C)

70

125