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July 2004

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Subject:
From:
"Mcmaster, Michael" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 28 Jul 2004 09:40:39 -0700
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text/plain (58 lines)
This could also be an issue of inventory/material availability.  The
fabricator may not have 1 oz copper in stock.

Another issue is the use of electrolytic nickel/gold.  There are galvanic
etching problems with the combination of Cu/Ni/Au as well as overhang/leaf
of the gold plating.  The more you have to etch through the more this can
become a problem.  0.5 oz copper in place of 1 oz makes sense in this
application.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Cal Driscoll
Sent: Wednesday, July 28, 2004 5:20 AM
To: [log in to unmask]
Subject: [TN] 1oz Copper vs. .5 oz Copper

Hi All-

One of our PCB designers came to us with a recommendation from our Bare
Board fab house-
We typically use 1 oz copper and the fab house is asking us to use .5 oz
copper and build it up to 1 oz.

Since I am not a designer, so I would like some input from TechNet on this
type of practice.

Facts:
99% of our boards are used in Telecommunications products
Most of our boards have QFP's in the 12 mil range
Typically most of our boards have Gold pads/finish


Thanks,
cal

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