There are several tables available through various standards, I'm sure
that someone will quote the relevant IPC std.

However if you want to work out some specific dimensions etc rather than
"about" ones try the PCBTEMP program available freely from:
www.ultracad.com
Its a PCB trace current/temperature calculator that allows you to enter
the required track widths/currents/thickness/temp rise etc & works out
the required result.

I find it very useful for this, as I can use it from the desktop rather
than search in the filing cabinet for a table.

Matthew Lamkin
Printed Circuitboard Draughtsman
Protec Fire Detection PLC.
Protec Hse, Churchill way,
Nelson, Lancashire.
England UK.
Email [log in to unmask]



>-----Original Message-----
>From:  Roberto Radaelli [SMTP:[log in to unmask]]
>Sent:  Tuesday, September 14, 1999 9:29 AM
>To:    [log in to unmask]
>Subject:       [TN] maximun current on pcb
>Importance:    High
>
>hi..
>
>i want to know if there is a table or rules
>to determine the maximun current in a pcb trace
>on fr4 material with different thickness of the copper
>
>for example the width for a 15 amps with a tamb of 45 celsius
>
>
>thank's at all
>
>[log in to unmask]
>rancilio coffee machine s.p.a. << File: ATT00090.html >>

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