Mike

We design among other things, garage door openers which have five amp motors which can use as much as ten
amps with the motor stalled.  We use 1 oz copper and 0.090" wide traces and have found no problems after
ten years of service with discoloration, delamination or other problems.  Hope this helps.  Let me know if
you need more info.  BTW we selected these values from the table in IPC-D-275.


Mark Ross


Mike Meade wrote:

> Can anyone help me on this issue ....
> We are using standard 2oz copper onto FR4 double sided board. We expect
> tracks in some areas to be subjected to temperatures between 135 and 140
> degrees C due to high currents passing through the track.  This temperature
> (or the current causing this elevated temperature) would be present
> occasionally (say once or twice daily for the life of the product) for about
> 10 seconds.  I have some reliability questions for which I need some
> guidance; What is the long term effects should the copper laminate be
> subjected to this temperature.  What is the maximum temperature that the
> tracks could be reliably subjected to for longer periods of time than that
> mentioned above. If anyone has any experience in this field or could point
> me in the right direction I would appreciate it.
> Regards
> Mike Meade
>
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