Christy; this is definitely a challenge; One option is to "socket" one of the BGA's, but I've never come accross a good "production" socket yet. The other option is to use a solder "hierarchy", where one of the bga's is applied with a lower melting point solder than the other. A last option is to locally attach one of the bga's using a bga repair tool which only locally heats the bga location. hope this helps! Jim Herard KBL, Product Quality Engineering IBM Microelectronics Endicott t/l 857-7026 ---------------------- Forwarded by Jim Herard/Endicott/IBM on 07-22-97 07:16 AM --------------------------- [log in to unmask] 07-22-97 12:00 AM Please respond to [log in to unmask] @ internet To: [log in to unmask] @ internet cc: Subject: ASSY: BGA Mounting Hello, How does one mount two BGAs on a board, where one is on the primary side and the other on the secondary side, directly beneath the first? Thanks in advance for your help. Christy Graham MICOM Communications Corp. 805-577-2210 [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************