Hi Joe! I've always left them in the tray ball-down when I've baked them, less handling that way. I never experienced any problems when doing that. Only other thing you should do is make sure that the tray can withstand the temperature. Because I've seen on occasion BGA's coming in non-bakable trays. -Steve Gregory- -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Macko, Joe @ IEC Sent: Wednesday, December 13, 2006 1:25 PM To: [log in to unmask] Subject: [TN] BGA placement in carrier trays during bake out Hello Fellow Techs, A question came up about what industry or best practice is when baking BGAs in high-temp. carrier trays (i.e., whether BGAs should be facing up or down in the carrier tray when baked out to avoid potential ball contamination). Question -- When baking out BGAs at 125 C, is it common practice to turn the parts upside down so the balls are facing UP (and not in contact with any carrier material) or is it acceptable to bake with the parts facing down into the carrier? I did not see anything about this in J-STD-033B. Thanks -Joe --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------