PCB hole with solder current rating. need confirm? - diyAudio
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Old 29th January 2015, 03:22 PM   #1
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Default PCB hole with solder current rating. need confirm?

In my PSU PCB there is a pad between two side of the board to pass current from big caps . Diameter is 1.5mm. It was filled with solder paste.

This is my caculate:

Circle area = d2 / 2 * pi = 1.5 * 1.5 * 3.14 / 2 = 3.53 mm2

So if copper thickness = 1oz = 0.035mm -> it is the same as copper with width = 3.53 / 0.035 = 100mm

So it can pass a lot of current? Am I right?

Last edited by obscurus; 29th January 2015 at 03:56 PM.
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Old 29th January 2015, 03:54 PM   #2
RJM1 is offline RJM1  United States
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Old 29th January 2015, 04:32 PM   #3
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Quote:
Originally Posted by RJM1 View Post
Thanks! That's help my problem. I also found add solder to that holes make no diferent because solder resistance ~ 10x bigger than copper.
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Old 31st January 2015, 09:39 AM   #4
AndrewT is offline AndrewT  Scotland
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Quote:
Circle area = d2 / 2 * pi = 1.5 * 1.5 * 3.14 / 2 = 3.53 mm2
Pi*D = circumference
Pi * RČ = area

D/2 * Pi = half of the circumference !

Area of the annual ring of a through plated hole = Pi * {DČ-dČ} / 4 where D = outer diameter and d = inner diameter.
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