Temperature Coefficient for Metal Film Resistors 1

[podri]

The Temperature Coefficient for Metal Film Resistors defined by manufacturers as +/- ppm.
What is the reason for such definition (what is the physical process for decreasing resistance with increasing temperature)?

 

[buzzp]

Podri,
I guess I never paid much attention to MF but should not the resistance go down with a decrease in temp?

 

[IRstuff]

http://www.vishay.com/document/63000/63000.pdf

explains why you might get positive or negative TC's for metal film resistors

TTFN

 

[nbucska]

There are two thermal effects: 1.) the spec. R of the metall
is increasing with T. 2.) The thermal expansion of the substate.


<nbucska@pcperipherals.com>

 

[buzzp]

Thanks for the link. Never knew that about MF resistors.