Hi Anne,

                In 1 oz copper, you can carry 25 amps on an external layer,
with a 50 degrees C rise
        in conductor temperature above ambient, with a trace .400" wide. In
2 oz copper, you can carry
        25 amps on an external layer, with a 30 degrees C rise in
temperature above ambient, with a trace
        about .250" wide. See IPC-2221, Sec 6.2. (or ANSI/IPC-D-275, Sec
3.5.2).
                Just between us, I'd strongly suggest using a power plane or
split power plane to
        minimize impedance and temperature rise.


 Michael Hiteshew
 Lockheed Martin Launching Systems
 [log in to unmask]
 (410) 682-1259



> Good Afternoon Technet,
>
> Does anyone know how thick a trace is required to carry 25 amps in 1 oz
> copper?  How about 2 oz copper?  Let's assume it's .062 thick material.
> Need help ASAP.  Thanks in advance.
>
> Anne Ledger
> EMDS, Inc.
> [log in to unmask]
>
>

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