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July 2004

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Subject:
From:
James Hofer <[log in to unmask]>
Reply To:
James Hofer <[log in to unmask]>
Date:
Wed, 28 Jul 2004 09:52:01 -0700
Content-Type:
text/plain
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text/plain (98 lines)
If the new shop has issues etching 1 oz foil with line widths below 6 or 7
mils than again they must be carefully looked at.

James Hofer
Director of Operations
Accurate Circuit Engineering
3019 S. Kilson Dr.
Santa Ana Ca. 92707-4202
714-546-2162 work
714-473-6127 cell
[log in to unmask]
----- Original Message -----
From: "Jeffrey Bush" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, July 28, 2004 7:05 AM
Subject: Re: [TN] 1oz Copper vs. .5 oz Copper


This is likely a capability issue - getting down below 6 or 7 mil lines
and spaces the starting weight (what you are etching) of the foil needs
to be less than 1 oz for good line resolution.  Thicker conductors in
denser geometries create a host of issues from conductor definition to
soldermask coverage to ID screen legibility, etc.


Jeffrey Bush
Director, Quality Assurance and Technical Support

                          76 Technology Drive - POB 1890
                             Brattleboro, Vermont 05302-1890
                                Tel. 802.257.4571.21 Fax. 802.257.0011
                                    [log in to unmask]
                              http://www.vtcircuits.com



-----Original Message-----
From: Cal Driscoll [mailto:[log in to unmask]]
Sent: Wednesday, July 28, 2004 8:20 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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