Re: [SI-LIST] : conductor thickness versus current

Mike Dudinsky X3204 (mtda@eci-esyst.com)
Mon, 16 Nov 98 15:21:05 EST

Tim,
You might be better off going to IPC-D-275 (Design Standard for Rigid Printed Boards and Rigid Printed Board Assemblies) Figure 3-4 to determine current carrying capacity for conductors on a PCB. Assuming a 10 degree C maximum permissable temperature rise, a 20 square mil conductor can carry approx. 1.2A on outer layers (surface) and approx. 0.6A on inner layers (internal). Hope that helps!

Mike Dudinsky
PCB Design Engineer
Raytheon Systems Company

> From owner-si-list@silab.Eng.Sun.COM Mon Nov 16 13:55:33 1998
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> Date: Mon, 16 Nov 1998 17:35:28 +0000
> To: si-list@silab.Eng.Sun.COM
> From: Tim Parks <tparks@ferrotec.ie>
> Subject: [SI-LIST] : conductor thickness versus current
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> Dear list
> I'm looking at a graph on page page 40 of Gerald L. Gonsbergs book "Printed
> Circuit Design".
>
> It shows three grahps relating track width/cross section to current
> carrying capability.
>
> My question is which graph relates to internal PCB tracks and which to
> external? So which conductor can carries a higher current; A 20 sq. mils
> internal track or a 20sq. mils external track.
>
> thanks in adance for you help
> Tim
>
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