Re: [SI-LIST] : 0.5 oz Cu's current density?

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From: Douglas McKean (dmckean@corp.auspex.com)
Date: Tue Oct 26 1999 - 19:13:10 PDT


At 09:43 AM 10/27/99 +0800, Hanyz@gsta.com wrote:
>
> I am routing a power supply board, but I don't
> know what trace width I should to use to feed
> a 10A current to load. Can somebody here tell
> me how calculate this?
>
> Thanks for any help
> HanYiZhou

I am reading straight off the graphs on page 38
of IPC-2221 "Generic Standard on Printed
Circuit Board Design", Feb 1998

Figure A
External: 10C rise = 425 sq mils
          20C rise = 250 sq mils

Figure C
Internal: 10C rise = off the chart
          20C rise = 700 sq mils

Since 1/2 oz Cu is about 0.7 mils in thickness,
divide out what you need for the width.

For this and other IPC specs, go to
http://www.ipc.org/

Regards, Doug

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