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March 2000

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Subject:
From:
Franklin Asbell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 15 Mar 2000 11:56:11 -0800
Content-Type:
text/plain
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text/plain (104 lines)
Dave,

Actually, if we receive trace requirements where finished width (to be
compensated by artwork) may be an issue we would compensate in the artwork
by default.

A good example is 3 mils or less, we would by default, bump that up slightly
because we already know what our etch capability is for fine lines. And
should width reduction become an issue it would be measured off of the
original 3 mil requirement.

Franklin D Asbell


----- Original Message -----
From: Dave Kell <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, March 15, 2000 6:07 AM
Subject: Re: [TN] Etched "Notches" or "Nicks" in copper traces -Reply


Yes, if your master is designed at 6 mil, your vendor can have overall width
down to 4.8 mils and isolated reductions down to 3.8 mils.  If this will
affect function, you need to specify a 6 mil minimum on your drawing.  Your
vendor will hopefully ask to increase their production artwork.

>>> [log in to unmask] 03/14/00 04:27pm >>>
It's a good question, I think you just misunderstood it.

Say I design a board with 6 mil minimum traces,
but I have routed the IC power at 10mils.
Is anyone saying I should accept 20% less than 6mils on those traces?
I don't think so....

                -----Original Message-----
                From:   Howieson, Rick [mailto:[log in to unmask]]

                What part of the minimum value is misunderstood? If the
requirement
                states minimum 10 mils WHY are you making it 11???
                Rick

                >-----Original Message-----
                >From:  Franklin Asbell [SMTP:[log in to unmask]]
                >
                >Keep in mind how that is worded. The requirement say's
"...20% of the
                >minimum value, or less."
                >
                >Now if the artwork require a minimum trace width of let's
say 10 mils, and
                >you make the trace 11 mils, the 11 mils trace is reduce by
21%, would this
                >be rejectable in accordance with A-600? Or would the
minimum value (i.e. 10
                >mils plus or minus the allowable tolerance) be the starting
point to
                >subtract 20%?


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