[sdiy] SMD resistors

[Fredrik Carlqvist]

Hi everybody!

I'm going to use a 1206 package with four 603 resistors inside with a
power rating of 1/16W per element. That's 1/4 W for the whole package.

How hot will it get at the maximum power? 

The maximum temp is specified to +125C, and the max ambient temp at
+70C. Derating starts at +70C. Does this mean that it will run 55C
hotter than ambient at full power?

Data sheet here: 
http://www.elfa.se/pdf/60/06040349.pdf


Thanks,

Fredrik C