[sdiy] Trace width and via diameter/hole size

[Philippe Derenne]

Hi Bert,

A little late, but...

I've seen something about trace's width and maximum current in Elektor
(sept. 2005)
The copper's thickness is supposed to be 35 µm.

0.1 mm - 0.5 A
0.2 mm - 0.7 A
0.3 mm - 1.0 A
0.5 mm - 1.2 A
0.8 mm - 1.5 A
1.0 mm - 1.7 A
1.5 mm - 2.0 A
2.0 mm - 4.0 A
3.0 mm - 6.0 A
5.0 mm - 8.0 A
10  mm - 12 A

Looks like your 640 mA for a 0.2 mm trace id pretty good...

Phil.----- Original Message -----
From: "Bert Schiettecatte" <bert at percussa.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, September 07, 2005 5:31 PM
Subject: [sdiy] Trace width and via diameter/hole size


> Hi all,
>
> I'm still working on a pcb here in Eagle, and I've been using the
> length-freq-ri.ulp program to find out how much current can go through
> my traces. It says 640mA through a 0.2mm trace. Is this correct? It
> sounds like a lot of current through such a tiny trace. The copper
> thickness is 0.035mm.
>
> This program tells you how much current can go through the traces, but
> what about the vias? How do you figure out how large the via hole needs
> to be to carry the required current? I searched and searched with google
> but couldn't find anything about via size, only trace width and
> clearance.
>
> Any ideas?
>
> Thanks,
> Bert
>