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Typical accepted trace temperature rise
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MathPi:
Hi All,

I tried searching through the forum but couldn't quite find what I am looking for. When designing PCB and calculating current rating for a given trace (let's say a trace on an outer layer), what is a typically accepted temperature rise? Reading through other forums/blog/online I see a large range anywhere between +10C to +85C. I'm thinking 20C is a good reasonable temp increase, but can't quite find anything to confirm/deny that. If ambient temp is 25C and trace increases in temp by 20C, then the result is 45C, which isn't going to burn the user if they touch it. I realize that the components nearby the trace will play a factor in this consideration, but for my particular application let's assume the trace is stand-alone trace without anything else nearby it. Looking for a rule of thumb, etc. Any user experience out there?

Cheers,
MathPi
Vovk_Z:
Possibly, it depends on your design restrictions and reliability/size ratio.
As I know, for a commercial design 70 C is not a high temperature.

What a design it is where a user is allowed to touch parts and PCB?
TimFox:
Important question:  at what temperature is there a risk of copper delamination from the substrate?
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