Julie
Most of our power supplies are part of a mixed signal board and
therefore limited to 1oz.  Where necessary we simply make the traces
wider.  As far as power carrying vias that are not filled with solder or
a component lead we use multiples to spread the load.  Our dedicated
power boards usually are 2oz and again, have parallel vias where
necessary.  Being that our particular uses range from a few mA to many
amps, there is no hard and fast rule, rather general guidelines and
engineering review.
John Thorup

> -----Original Message-----
> From: Julie Dixon [SMTP:[log in to unmask]]
> Sent: Wednesday, November 03, 1999 10:20 AM
> To:   [log in to unmask]
> Subject:      [TN] Power Supply PCB's
>
> Dear K.K.,
>
> What foil weight do you call out for the base laminate? 1 ounce or 2
> ounces?
> Do you require the PTH's to be plated to 1 mil or 2 mil?
> Thanks for response!
>
> Sincerely,
> Julie Dixon
>
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