James Paul, Removing or reducing unused internal pads should have no effect on your board If this is a soldered pad, the fault most likely lies in the soldering of the pad/hole. Without the additional internal copper to dissipate the heat, it may have broken down. Many fabricators recommend or will remove unused pads on internal layers for you. A 60 pad should be sufficient for a 32 hole though. A 64 is more ideal, but it all depends on application. If internal pads are to be removed, it is recommended that the external pads are a bit larger to dissipate heat. Chris Robertson [log in to unmask] Senior Designer Lockheed-Martin Services Inc. 4912 Research Dr. Huntsville, AL 35805 (256) 722-2626 http://www.lmsg.lmco.com > Hi > I have used 60 mil pad dia with 32 mil hole design for > past 14 years. so far i did not come accross any > failure of the solder joint due to design error. > however i have found failures when i suppressed the > pads in the power plane where it was unconected, on > high frequency ECL design boards. hence i feel 60 mil > pad dia with 32 mil pad and unsuppressed pads in the > planes will give best reliability > > regards james m paul > > --- Jack Olson <[log in to unmask]> wrote: > > I never thought THAT coin would have two sides... > > HA! > > It isn't often that a response takes me totally > > by surprise. > > Thanks, that was a great one! > > > > sushi anyone? > > Jack > > > > > > --- [log in to unmask] wrote: > > > Jack- > > > > > > Sometimes a guy just wants a fish. Sometimes a guy > > > is just visiting the > > > coast and wants to try fish. You could give him > > one > > > or you could teach him > > > to fish. So he's gotta buy a hook and some line, > > > probably a rod and reel, > > > maybe some bait. Then he has to learn how to bait > > > the hook. He has to > > > learn where and when they bite. Pretty soon he > > finds > > > he has to buy a boat > > > to do any good. So he decides he hates seafood > > > anyway and goes back to his > > > cattle ranch. But if you'd given him a fish, maybe > > > he'd-a liked it enough > > > to learn how to fish himself. > > > > > > __________________________________________________ > > Do You Yahoo!? > > Make international calls for as low as $.04/minute > > with Yahoo! Messenger > > http://phonecard.yahoo.com/ > > > > > -------------------------------------------------------------- > ------------------- > > DesignerCouncil 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 > > DesignerCouncil. > > To set a vacation stop for delivery of > > DesignerCouncil send: SET DesignerCouncil NOMAIL > > Search previous postings at: www.ipc.org > On-Line > > Resources & Databases > E-mail 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 > > > -------------------------------------------------------------- > ------------------- > > > __________________________________________________ > Do You Yahoo!? > Get email alerts & NEW webcam video instant messaging with > Yahoo! Messenger > http://im.yahoo.com > > -------------------------------------------------------------- > ------------------- > DesignerCouncil 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 DesignerCouncil. > To set a vacation stop for delivery of DesignerCouncil send: > SET DesignerCouncil NOMAIL > Search previous postings at: www.ipc.org > On-Line Resources > & Databases > E-mail 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 > -------------------------------------------------------------- > -------------------