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- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------