David Ricketts
Pertek Engineering
Voice:
949-475-4485
Fax: 949-475-4493
-----Original Message-----
From: TechNet
[mailto:[log in to unmask]]On Behalf Of Steve Gregory
Sent:
Friday, June 21, 2002 11:54 AM
To: [log in to unmask]
Subject:
[TN] PCB lay-out problem...
Hi all,
We're having a board lay-out done outside, and as with
new designs, I will get asked to look at the preliminary gerbers to see if I can
see anything out of place that might need changing.
I looked the the
gerbers that were given to me and the first think I noticed was that on some IC
footprints, there was 1 rectangular pad, then 9 pads where the corners were
rounded, then a rectangular pad, and on and on...
So I fed that back to
our engineer here who is over this project, then he fed that back to the
individual who is doing the lay-out. Our engineer here then came back to me and
asked if that would be a problem, and I told him it could be, but why not make
all the pads uniform? Go to: http://www.stevezeva.homestead.com and look at
"OrCad" to see what I mean.
His reply was that the individual doing the
layout told him he would have to go in and manually edit each one of the pads
that were rectangular, and that it would be too much trouble. He said this is
the way OrCad put the footprint down, and if it was such a problem, why would
OrCad have this footprint in the library? Then he added that the IPC-SM-782 says
that you can either use rectangular pads or optionally round the corners, so
that tells him you can use either one or both, and it doesn't make any
difference. So he told the layout person to leave things as they are.
I
don't know anything at all about OrCad, but something tells me there's an
operator problem here. I've never seen a footprint like this before, and no
matter what I say, I can't convince our engineer here that the footprint needs
to be fixed.
HELP!!! PLEASE!!!
Thanks,
-Steve
Gregory-