Techies, The paragraph below is from one of our design engineers asking about placing BGAs on both sides of the board. I am not as up-to-date on this as I could be, so I am asking for advice from the group. "Recently I talked to Jerry about sequential lam PWB technology. This basically creates a double-sided board conceptually like the old Cu-Invar-Cu double-sided boards, except without the core, and with the capability for through-hole vias to connect the two sides. If we use sequential lam, then it will be natural to want to put BGA packages on both sides of the board, otherwise we will not get the full benefit out of this. I know this was taboo the last time I asked, but I now need to ask in more detail if any options at all exist for putting BGAs on both sides, and roughly what the cost impact might be." Any help with experiences or further resources is most appreciated. Thanks, Stu Korringa Product Quality Engineer Smiths Industries-Aerospace Grand Rapids, Mi. 616-241-8189 ********************************************************************** This e-mail and any files transmitted with it are confidential and may be legally privileged or otherwise exempt from disclosure under applicable law. This e-mail and its files are intended solely for the individual or entity to whom they are addressed and their content is the property of Smiths Aerospace. If you are not the intended recipient, please do not read, copy, use or disclose this communication. If you have received this e-mail in error please notify the e-mail administrator at [log in to unmask] and then delete this e-mail, its files and any copies. This footnote also confirms that this e-mail message has been scanned for the presence of known computer viruses. Smiths addresses are changing! The new addresses will be of the form [log in to unmask] Please update your address books! *********************************************************************** --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 -----------------------------------------------------