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Old 14th November 2004, 08:26 PM   #1
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Default PCB Trace Width Current rating??

Is there a standard that determins trace width based on current?

IE, if i have a 2 oz copper board, how do i determin how wide the traces need to be at minimum for a given current rating???


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Old 14th November 2004, 08:34 PM   #2
Tim__x is offline Tim__x  Canada
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http://www.ultracad.com/ipcchart.htm
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Old 14th November 2004, 08:40 PM   #3
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Indeed Tim,

Also

http://www.ultracad.com/pcbtemp.pdf

and the free calculator:

http://www.ultracad.com/pcbtemp.zip

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Old 14th November 2004, 08:47 PM   #4
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Thank you!!!


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Old 15th November 2004, 06:55 AM   #5
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Try this

http://www.geocities.com/suppanz/TraceWidth.xls
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Old 16th November 2004, 05:16 AM   #6
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good reading material at
www.elfa.se
The file is fakta.pdf
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Old 16th November 2004, 06:31 AM   #7
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Default Re: PCB Trace Width Current rating??

Quote:
Originally posted by Zero Cool
Is there a standard that determins trace width based on current?

IE, if i have a 2 oz copper board, how do i determin how wide the traces need to be at minimum for a given current rating???


Zero
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Old 21st November 2004, 07:36 PM   #8
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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
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Old 21st November 2004, 07:47 PM   #9
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Zero Cool
If you are interested send me an email. I have a copy of the PCB engineering handbook that will give you more info then you could possibly use. (NOT)

We're both in the TC's, I can get it to you.
Mike
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Old 21st November 2004, 07:48 PM   #10
Electrons are yellow and more is better!
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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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