Hi Victor - BGAs on both sides is doable - but it is not very much fun. I have seen some SMT test boards with double sided BGA but there was careful selection of BGA pad size and weight so that the solder surface tension was favorable and the reflow profile was very rigidly controlled with little room for error/changes. The process window was considered to be too tight and the design never went to production. There may be other TechNetee's that have made the last leap. Good luck. Dave Hillman Rockwell Collins [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: Re: BGA assembly. Author: [log in to unmask] at ccmgw1 Date: 12/10/96 10:08 AM Hi Victor, I have seen one side QFP and the other side BGA. Both sides mount with BGAs, I have not seen before. To do that, reflow the side with QFP first, of course please remember to glue the QFP, then reflow the other side with BGA. That's all...This is what I have seen. In case you ever seen reflow BGA both sides of the Board, please do tell me. I am curious to know too.. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-=-=-=-=-=-=-=-==-=-=-=-=-=-=-= -=-= / Kong Hui Poh / / Techgate / / - The Technological Gateway - / / Email Add: [log in to unmask] / / ............................................................................ ...................................................../ /__________________________________________________________________________/ *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * 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 unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * 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] * ***************************************************************************