Dale CMF & RN Resistor

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kecapmanis021

kecapmanis021

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Joined 2017
#1
Need some advice regarding Dale CMF and RN. Are they basically the same wattage if we disregard the Mil-spec wattage derating for RN?

Let's say for use in amplifier, can we just equate:

CMF55 = RN55 = 0.5W?
CMF60 = RN60 = 1W?

Thanks guys.

~Kecap
 
#3
Straight from the datasheet:

"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)."
 
#6
If I look at the RN datasheet, it says:

CMF55 = RN55 = 1/8W
CMF60 = RN60 = 1/4W

If I look at CMF datasheet, it says:

CMF55 = 1/2W
CMF60 = 1W

I think basically CMF55 = RN55 = 1/2W, and
CMF60 = RN60 = 1W

when not used in military equipment (Mil-spec watt derating). I'd like to know what others think. Thanks.

~Kecap
 
#8
kecapmanis021 said:
If I look at the RN datasheet, it says:

CMF55 = RN55 = 1/8W
CMF60 = RN60 = 1/4W

If I look at CMF datasheet, it says:

CMF55 = 1/2W
CMF60 = 1W

I think basically CMF55 = RN55 = 1/2W, and
CMF60 = RN60 = 1W

when not used in military equipment (Mil-spec watt derating). I'd like to know what others think. Thanks.

~Kecap
Click to expand...

I'd agree with that. For our use the specs are 1/2W and 1W. In mil apps the derating is used to make sure the equipment keeps on working in a middle east desert, all covered up with dust etc.

So it is strictly a derating, no difference in the resistors themselves.

Jan
 
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