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 ---------------------------------------------------------------------------------