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May 2000

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Subject:
From:
"Roger M. Stoops" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 22 May 2000 19:41:56 +0000
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text/plain (102 lines)
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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