Socially transmitted disease and an old term soldering temperature duration, which related to time an iron was held to a joint or dwell in a solder fountain or contact time across the wave. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David Tremmel Sent: Thursday, March 20, 2008 12:45 PM To: [log in to unmask] Subject: [TN] J-STD-33 and 33B.1 Hello TechNet gurus, In a former life I was responsible for a BGA reballing operation and the bake-in / bake-out times and temps was based on J-STD-33. A typical leaded PBGA was MSL 3 and we baked it for 24 hrs at 125°C yaddah, yaddah, yaddah. According to J-STD-33B.1 it appears that the same component now has a bake time of 27 hrs and not 24 hrs? I understand the same PBGA going from a lead to a lead-free package and from MSL 3 to MSL 4. But why were the 3 hours added between the 2 standards? Also, I realize that STD is short for STanDard, but doesn't STD also mean something else? Thank you in advance for your replies. Thank you, David Tremmel Value Recovery --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 15.0 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 -----------------------------------------------------