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Date: | Wed, 28 Jul 2004 09:52:01 -0700 |
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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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