Hi Carl, Go with 1), forget 4) Werner -----Original Message----- From: Carl Ray <[log in to unmask]> To: [log in to unmask] Sent: Mon, Feb 15, 2010 5:49 pm Subject: [TN] Pre-Tinned BGA? Hello All, I had a question to see if anyone has tried anything different. Most of our customers are some how related to the military. So we have one product that the customer just found out was a PB-Free device. They want us to "pre-tin" the spheres. Now I have tried several process for forward and backward processes. None of them include re-tinning of a BGA Device. We do re-tin other leaded and some non leaded devices. So below are the three options I have recommended but still have reliability concerns as the end product is to be coated with Paralyne. 1. Re- Ball to PB/SN 2. Sue a selective rework machine and place pate with isolated heat if the substraight could handle. 3. Purchase the component in PB/SN material 4. Reflow the product with slightly higher temps (5c per 10 zones) once out of over and cold to room temp underfil the device. Again if anyone has any more ideas I am game!! Carl Ray Lewisburg TN 37091 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- 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 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- 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 -----------------------------------------------------