I have tried to search for answers for this on this forum but have not found it. I read too many conflicting info on Google.
I have a circuit that will take 2 amps max. I the trace is 20 mil wide. The via is 12mm hole and 24mm pad. The length is less than 2 inches.
How much current will this compfortably handle? If it is not enough do I increase the hole or the pad, or both? or number of Vias?
Thank you.
Charlie
It's a tricky subject and not well documented.
You have not said anything about the edge speed of any currents flowing through the vias(s). This is important if you are using them in the high current signal paths for a switch mode circuit such as a PSU or Class D amplifier since the impedance due to the via inductance may dominate the DC resistance and even the AC resistance due to skin effect.
https://www.ti.com/seclit/ml/slup230/slup230.pdf
and:
https://www.ultracad.com/articles/viacurrents.pdf
given in:
http://circuitcalculator.com/wordpress/2006/03/12/pcb-via-calculator/
https://www.dataweek.co.za/59129n
You may be able to find copies of the book it refers to from a number of online sources.
BTW, I assume that "The via is 12mm hole and 24mm pad." should be:
"The via is 12mil hole and 24mil pad."