Author Topic: Typical accepted trace temperature rise  (Read 704 times)

0 Members and 1 Guest are viewing this topic.

Offline MathPiTopic starter

  • Newbie
  • Posts: 3
  • Country: ca
Typical accepted trace temperature rise
« on: March 28, 2022, 08:21:34 pm »
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
« Last Edit: March 28, 2022, 08:23:20 pm by MathPi »
 

Offline Vovk_Z

  • Super Contributor
  • ***
  • Posts: 1478
  • Country: ua
Re: Typical accepted trace temperature rise
« Reply #1 on: March 29, 2022, 01:53:37 pm »
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?
« Last Edit: March 29, 2022, 01:55:11 pm by Vovk_Z »
 
The following users thanked this post: MathPi

Offline TimFox

  • Super Contributor
  • ***
  • Posts: 9002
  • Country: us
  • Retired, now restoring antique test equipment
Re: Typical accepted trace temperature rise
« Reply #2 on: March 29, 2022, 02:02:30 pm »
Important question:  at what temperature is there a risk of copper delamination from the substrate?
 
The following users thanked this post: MathPi


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf