Hal Murray wrote:
>> Depends on what it's made of and how well it's cooled. We use 0603
>> surface-mount resistors at half a watt, because we heat sink them
>> well. Half-watt carbon resistors will die at half a watt in a confined
>> space.
>> Enameled wirewounds are very tough, up until the enamel melts.
>> Some resistors will die from temperture cycling stress.
>> But in general it's good to derate 0.5 maybe.
> There is another dimension to consider: duty cycle. I've been told
> (but don't have first hand experience) that old fashioned carbon
> composition resistors are much better at pulse loads that newer
> carbon film resistors.
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