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Reply To: | TechNet E-Mail Forum. |
Date: | Mon, 22 May 2000 19:41:56 +0000 |
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Is this 4oz before plating or after plating? Typically you start with 3oz
Cu and plate 1oz, which gives you a little more than 0.001" Cu plating in
the holes. Don't forget to allow for etch factor, i.e., a 0.020" trace
will be equivalent to 0.017" or so after etching. Forget about 6 or 7 mil
traces.
You can use 3 oz copper for inner layers, but the same scenario above
applies. Check with your current supplier(s) to see if they have any
heartburn about this. Thay may want to only see 2 oz Cu at the maximum.
Be sure and spell out exactly what you want in your documentation.
Have you thought about a 6-layer board, using 2 oz copper on the inner
layers, duplicating say, layer 2 and 4, and 3 and 5? This would distribute
any resulting heat. and you would get better current-carrying capacity
because of the redundant thermal connections (if you use them).
Roger M. Stoops, PCB Designer
Spectra Precision Inc. Ph: 937.233.8921
5475 Kellenburger Rd. 937.233.4574 ext
Dayton, OH 45424-1099 288
USA Fax: 937.233.7511
Member IPC
Designer's Council,
C.I.D.
Darrel
Therriault To: [log in to unmask]
<darrelt@NCUB cc:
E.COM> Subject: [TN] 4 oz Cu
Sent by:
TechNet
<[log in to unmask]
ORG>
05/22/00
07:19 PM
Please
respond to
"TechNet
E-Mail
Forum.";
Please
respond to
Darrel
Therriault
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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