My notes are little vague. It looks like it was with a 6 mil stencil for BGA/gullwing configurations. I know J-leads you will need 8 mil or better. J-leads because of shape/wetted area are hardest to hang upside down. BGA's are much easier to suspend inverted. -Mike -----Original Message----- From: Leland Woodall [mailto:[log in to unmask]] Sent: Monday, September 21, 2009 11:44 AM To: TechNet E-Mail Forum; McGee, Michael Subject: RE: [TN] Double sided reflow? Michael, Do you know what stencil thickness was used during the testing you mentioned below? Leland -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of McGee, Michael Sent: Monday, September 21, 2009 12:10 PM To: [log in to unmask] Subject: Re: [TN] Double sided reflow? Experience and testing have shown that <.046g/mm2 works good. I believe this number was posted on technet before. The area refers to the wetted area of the lead i.e. the foot that sits on the pad. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Braddock, Iain (UK) Sent: Monday, September 21, 2009 11:00 AM To: [log in to unmask] Subject: [TN] Double sided reflow? Tech's, I know it has been well covered in the past but I urgently need the rule of thumb formula (surface area/component mass?) for ensuring components previously soldered on one side won't fall off when subjected to second side reflowing. I have it somewhere but can I find it...? I have tried to access the archives and am struggling with passwords, so in the meantime could anyone help? CIA, Iain. ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. MBDA UK Limited, a company registered in England and Wales, registration number 3144919 whose registered office is at Six Hills Way, Stevenage, Hertfordshire, SG1 2DA, England. ******************************************************************** ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------