Can you plug from one side and coat with LPI from the other? -----Original Message----- From: Ofer Cohen [mailto:[log in to unmask]] Sent: Tuesday, May 27, 2003 8:19 AM To: [log in to unmask] Subject: [TN] Plugging under BGAs Technetters, Most of our boards carry BGA (pitch => 1 mm). The finish is HASL, which, from various reasons, can't be changed. The general rule is to plug all the through-hole vias from the print side, apart of BGA locations, where the plugging is from the BGA side (mostly components side). In a new design, there are pairs of identical BGA-packaged components from both PCB sides, using the same TH vias. I have two options: 1. To select one side to plug (danger of solder balls under the BGA of the other side), or 2. Plug from both sides (danger of over-stress on the hole plating during the reflow, because of the air pressure inside the hole. What is your opinion? Regards Ofer Cohen Quality Assurance Manager Seabridge Ltd. --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------