I agree. The time and temperature required to dry the chips in tubes would be highly dependent on how much air can circulate through the tubes while drying. If the tubes are airtight, the chips would never dry out. Dave Roach -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Leo Higgins Sent: Thursday, December 01, 2005 9:05 AM To: [log in to unmask] Subject: Re: [TN] moisture bake-out of ICs in tubes Hello Graham, What are the package details (type, dimensions, pin count)? I suggest you use a service company to transfer the parts from the tubes to proper Jedec trays and then bake them per recommended Jedec procedures. The relatively low cost for this service should more than offset the risk to shortcut proper procedures. All bets are off otherwise. Best regards, Leo Leo M. Higgins III, Ph.D. Vice President Technical Support Operations ASAT, Inc. 3755 Capital of Texas Highway, Suite 100 Austin, Texas 78704 ph 512-383-4593 fx 512-383-1590 [log in to unmask] www.asat.com The information contained in this electronic message is CUSTOMER/SUPPLIER PRIVILEGED AND CONFIDENTIAL INFORMATION intended only for the use of the individual or entity named above. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution and copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by electronic mail. Thank you. -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Graham Collins Sent: Thursday, December 01, 2005 8:04 AM To: [log in to unmask] Subject: [TN] moisture bake-out of ICs in tubes Hello Technet! I've got a pile of ICs received in tubes, that are MSL 3 and have been exposed to ambient conditions. Thus, the parts need to be baked out. My question is this: if I want to bake them in the tubes (not take them out of the tubes), what lowered temperature / longer time can I use? The quantity means it would be very painful to take them out of the tubes, and I know the tubes won't withstand 90C / 2 days, but the 40C / 28 days alternative per J-STD-033 (body <= 2mm, per table 4-1) is not great either. How can I calculate a happy medium between these two time/temp combinations? I do know this has come up on Technet before, but I can't find it in the archive. Thanks! regards, Graham Collins Process Engineer, L-3 Communications Electronic Systems Inc. Halifax (902) 873-2000 ext 6215 --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------