Mike, Enlarging the corner pads would seriously affect co-planarity. A better approach seems to be to eliminate the corner pads. Many manufacturers are doing this. Bruce Misner > ---------- > From: Yuen, Mike[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum. > Sent: Wednesday, October 17, 2001 10:59 AM > To: [log in to unmask] > Subject: [TN] BGA corner pad > > Greetings, > > I understand BGA reliability is a very complex subject. Folks had been > doing DOEs for years trying to determine the significant factors > involved. For most perimeter PBGA, corners joint seem to be the weakest > link. I wonder if anyone out there had done studies on enlarging just > the corner pads of a BGA to enhance reliability. > > Thanks, > M. Yuen > > -------------------------------------------------------------------------- > ------- > 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 the following message: SET > Technet 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 > -------------------------------------------------------------------------- > ------- > --------------------------------------------------------------------------------- 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 the following message: SET Technet 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 ---------------------------------------------------------------------------------