Is it likely that surface mount resistors will burn out at 82C?
Is it likely that surface mount resistors will burn out at 82C?
(OP)
Is it likely that surface mount resistors would burn out at 82C (180F) when they are not powered? I do not have a datasheet for these; a general idea of what temperature different resistors typically burn out at would be helpful.
Thanks,
David
Thanks,
David





RE: Is it likely that surface mount resistors will burn out at 82C?
RE: Is it likely that surface mount resistors will burn out at 82C?
Of course, a resistor operated in a ambient temperature of 82 C would have to be de-rated for it's power dissipation. The chart I have for this shows derating to about 85% of normal at this temperature. The chart I have in front of me (Venkel) shows at 150C the resistor has to be derated to about 25% of normal. If these resistors operate to these temperatures, the should be able to be stored (non-operating) at these temperatures.
RE: Is it likely that surface mount resistors will burn out at 82C?
Look at a data sheet you will get a feel for the subject.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Is it likely that surface mount resistors will burn out at 82C?
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Is it likely that surface mount resistors will burn out at 82C?
RE: Is it likely that surface mount resistors will burn out at 82C?
The conformal coating on the circuit boards has been changed and he is concerned about the resistors burning out at high temperature- he only wants to expose the boards to the high temperature though, not power them at high temperature.
The exposure time is 7 days and I don't imagine the coating will change the temperature the board reaches. Perhaps it will get there a bit faster... Any thoughts?
RE: Is it likely that surface mount resistors will burn out at 82C?
And conformal coating surface mount parts will change their power dissipation ability during powered use, of course.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com