As far as #2, go to  http://www.ultracad.com  and download the calculator
that you need.
Roger M. Stoops, C.I.D., PCB Designer


Trimble
Engineering and Construction Division
5475 Kellenburger Rd.
Dayton, OH 45424-1099 USA
Ph: +01 937.233.8921 or +01 937.233.4574 ext 288
Fax: +01 937.233.7511






                    "Jana L.
                    Carraway"              To:     [log in to unmask]
                    <carrawayj@BIOT        cc:
                    RONIK.COM>             Subject:     [TN] Etch Rates/Factors and Current Carrying Capacity of Fine lines
                    Sent by:
                    TechNet
                    <[log in to unmask]
                    G>


                    03/26/01 11:21
                    AM
                    Please respond
                    to "TechNet
                    E-Mail Forum.";
                    Please respond
                    to "Jana L.
                    Carraway"





Greetings IPC TechNet Forum!

I am in search of information on two topics: 1)Etch rates/factors for
cupric
chloride etchant and 2) current carrying capacity of very fine lines.

1) With respect to Cupric Chloride etchant, does anyone have information
they would be willing to share on the etch rate and etch profile?  My dusty
brain cells seem to remember that the etch rate increases with acid
normality, but that the lateral etch increases as well.  I have it in mind
that for fine line, an acid normality of around 1.0 N produced the best
etch
factor, although affected the speed/throughput.  Would anyone have a bit of
information they could share on this?

2) My copy of the Printed Circuit Manufacturing book has current carrying
capacity vs line width down to 0.020" lines.... I am looking for the
current
carrying capacity of 25, 50, and 75 micron lines.  Could someone point me
in
the direction of this information?

I greatly appreciate the help.
Best Regards,
Jana Carraway


Jana Carraway
Micro Systems Engineering, Inc.
6024 SW Jean Road
Lake Oswego, OR  97035
503-635-4016

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