.... tacky past fux, eh? Never thought of bringing any of those to work. Peter tuan.bui@CONE XANT.COM To: [log in to unmask] Sent by: cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST TechNet Aero/ST Group) <[log in to unmask] Subject: Re: [TN] BGA Rework Using Paste vs. ORG> No Paste 02/01/02 02:58 AM Please respond to "TechNet E-Mail Forum."; Please respond to tuan.bui Jeff, We have been working and reworking BGA and Micro BGA for quite sometime. This is a requirement in a prorotye environment. We tried using micro stencil when we first attempt to replace the BGAs and found out that using micro stencil was not a good method. We then tried using no-clean tacky past fux and applied to both the BGA and the PWB substrates. This process has been adopted in our process and has been working well for us. Here are some great benefit of using flux paste only. - No micro stencil cost. - No cleaning is needed (No-clean flux). - No aligning equipment is needed, since we can place the BGA into its footprints without worry about smearing the solder paste, and if the hand alignment if off ( no more than 50%), the liquid tension of the reflowed solder balls will pull it back. - Save time and money. ( stencil cost, cleaning, and aligning). If the solder balls on the BGA are made of non-eutectic, solder paste is required. Tuan Bui Conexant Systems Inc. Prototype Process Dev. Eng. Jeff Ferry <jferry@CIRCUITTE To: [log in to unmask] CHCTR.COM> cc: Sent by: TechNet Subject: [TN] BGA Rework Using Paste vs. <[log in to unmask]> No Paste 01/31/02 08:54 AM Please respond to "TechNet E-Mail Forum."; Please respond to Jeff Ferry Fellow TechNetters, We nearly always apply solder paste to the circuit board when we replace BGA components during rework. Yet, after speaking with a handfull of BGA equipment companies at APEX, seems like they all recommend using flux only vs. paste, unless the circuit board is used in a high rel application. What do ya'all do/recommend for BAG rework? Can you point me to any studies/reports on the subject? Thanks, Jeff Ferry CEO Circuit Technology Center, Inc. --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 --------------------------------------------------------------------------------- [This e-mail is confidential and may also be privileged. If you are not the intended recipient, please delete it and notify us immediately; you should not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------