Re: PCB trace temperature?

From: Spehro Pefhany (speffSNIP_at_interlogDOTyou.knowwhat)
Date: 12/17/04 

Date: Thu, 16 Dec 2004 21:46:58 -0500

On Fri, 17 Dec 2004 01:18:58 GMT, the renowned "Gary Pace"
<xxx@yyy.com> wrote:

>100C on FR4 with good bonding between the copper and substrate. This will
>probably discolour the board over a couple of years. 80C if you're being
>conservative.

Keep in mind that the temperature rise is above ambient temperature in
the area where the traces are. If it's 45°C outside the housing and
65°C inside the housing, then that's your base temperature. If you
want to limit it to 80°C then you can't have any more than 15°C rise.

>Much hotter on expensive substrates etc.

Yes, some of the expensive substrates are MUCH better than FR4.

Best regards,
Spehro Pefhany 

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