Darrel,

We have found that many houses are UL certified to 4 oz. copper, however
there is a price to pay for it, both in cost and raw material delivery time.

We had one vendor who realized that with the heavy copper that the vias
should be thicker to accommodate the assumed higher current carrying
capability of the 4 oz. copper traces.

Good luck,

Phil Nutting
Manufacturing Engineer
Kaiser Systems, Inc.
126 Sohier Road
Beverly, MA 01915
ph: 978-922-9300
fx: 978-922-8374
[log in to unmask]


-----Original Message-----
From: Darrel Therriault [mailto:[log in to unmask]]
Sent: Monday, May 22, 2000 3:20 PM
To: [log in to unmask]
Subject: [TN] 4 oz Cu


TechNetters,

Design Engineering is requesting we go to 4 oz Cu for a new power module
design, 4 layer PWB.

Any gotcha's with 4 oz Cu we need to be aware of and is this a fairly
standard job for
PWB houses??

Any comments, info or recommended PWB suppliers appreciated.

Tks......DT

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