Interesting. We have a new engineer who the powers that be allowed to use
his personal Orcad copy to lay out a board because of capacity constraints
in design. I just looked at his output and it has the same pattern. I'm
told it is a pin counting aid (10,20,30,etc). I'll be interested to know if
anybody has had a problem with this. The board went for FAB today, quick
turn and can't fail. I think Murphy is visiting.
> -----Original Message-----
> From: Steve Gregory [SMTP:[log in to unmask]]
> 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-
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