Do a search on Google with the terms "pcb trace width and current".
Select images and use the charts that have been in place for decades. A
good picture is at
http://www.ultracad.com/ipccha1.gifEasy charts to use. Based on current desired and temperature rise, say
10C. Use the top graph to find cross section of 7 sq.mils. Then go down
one graph to the External Copper layers and, depending on copper
thickness, say 1/2 oz, the trace width should be about 0.010. Use the
bottom chart for internal copper layers.
Derek Koonce
DDK Interactive Consulting Services
On 10/4/2012 8:32 AM, Boots Hughston wrote:
>
> I would not run 500ma through a 8/1000 trace. It will not handle it
> for long.
>
> Boots-2b1
>
> Sent from my iPhone
>
> On Oct 4, 2012, at 7:37 AM, Kevin Byrne <kbyrne10@...
> <mailto:kbyrne10%40yahoo.com>> wrote:
>
> > Thanks for the math. It is a study I struggle with. The web site I
> talked about has a way of putting oz formula into the calculator I did
> not know about.
> > Example current 500mA, spec.trace width - inch, spec. length 4in.
> Answer comes out to 0.00878in trace width @ 500mA. That is what I was
> after. Best to you and thank you for clearing that up
> > from myself. Kevin
> >
> > ________________________________
> > From: John Anhalt <janhalt@... <mailto:janhalt%40cox.net>>
> > To: Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>
> > Sent: Thursday, October 4, 2012 8:29 AM
> > Subject: Re: [Homebrew_PCBs] Re: Copper Clad Board Info
> >
> >
> >
> > 35 microns = 35x10^-3 mm
> >
> > (35X10^-3mm) รท (25.4mm/in) = 1.38X10^-3 inch = 1.38 mil
> >
> > John
> >
> > ----- Original Message -----
> > From: kbyrne10
> > To: Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>
> > Sent: Thursday, October 04, 2012 9:02 AM
> > Subject: [Homebrew_PCBs] Re: Copper Clad Board Info
> >
> > Thanks for the help. Is there a good conversion calculator site
> available as I suffer thru math?
> >
> > --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>, Leon Heller <leon355@...> wrote:
> > >
> > > On 04/10/2012 11:54, kbyrne10 wrote:
> > > > I know of a trace calculator on a web site for determining
> width's of
> > > > traces but I need a question answered. If I buy stock PCB boards
> what is
> > > > the thickness of the copper itself? It asks for thickness like 1mil,
> > > > 2mil, 5mil, & 10mil. To be exact I need to figure this out.
> Thank you Kevin
> > >
> > > Copper thickness for most board material available to hobbyists is
> 1 oz
> > > per sq. ft. which equates to 35 microns.
> > >
> > > Leon
> > > --
> > > Leon Heller
> > > G1HSM
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> > [Non-text portions of this message have been removed]
> >
> >
>
> [Non-text portions of this message have been removed]
>
>
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