PCB Trace Width Current rating??

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Zero Cool

Zero Cool

Member
Joined 2004
Thanks for the info.

I was trying to determin how wide i needed to make traces for a Power Supply PCB.

If the supply is rated for 70-100Vdc at at least 10 amps, how wide do i need to make the traces with a 2 oz copper PCB???

If i understand the info correctly, a 420mil wide traces will work and have a 10 deg C temp rise.

But, what is allowable for temp rise? what is a standard temp rise number?

Thanks resolution for the XLS chart. that works well.


Zero
 
peranders

peranders

Member
Joined 2002
sjostromaudio.com
Paid Member
150 mils 1 oz. copper, 20A => the copper gets warm.

100 mils, 2 oz. 10 A is really OK but if you can make it wider do so. You must also consider the short circuit current and how big you fuses are. Can the pcb handle a short circuit?

My recomendation is 150 mils at least but 200-300 mils better if you can.

Max temp is 130-150 deg but the pcb will eventually get brown/black. Strive for max 60-80 degrees C.
 
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