I have the same problem with some BGAs and I would like to find out where I can buy the spacers? Any vendors? Rick Thompson <[log in to unmask]> on 10/10/2000 09:37:20 AM Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to Rick Thompson <[log in to unmask]> To: [log in to unmask] cc: (bcc: Arturo Urias/AUS/NIC) Subject: Re: [TN] Heavy BGA's, now it's fine-pitch ! Daan, Based on our experience with the larger TI '6x' BGAs I'd agree with Ryan and Steve. With those parts we try to shim them so that ball collapse is 30-35% of the ball diameter. Rick Thompson Ventura Electronics Assembly 2665A Park Center Dr. Simi Valley, CA 93065 +1 (805) 584-9858 voice +1 (805) 584-1529 fax [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of d. terstegge Sent: Tuesday, October 10, 2000 7:25 AM To: [log in to unmask] Subject: Re: [TN] Heavy BGA's, now it's fine-pitch ! Hi Jim, Thanks for the suggestion. Any idea on how thick such a spacer should be, and how to apply it ? Like I mentioned, trial and error is no option for this project. Kind regards, Daan Terstegge SMT Centre Signaal Communications Unclassified mail Personal Website: http://www.smtinfo.net >>> "Marsico, James" <[log in to unmask]> 10/10 2:08 pm >>> How about using a temporary spacer under each corner? Jim M. -----Original Message----- From: d. terstegge [SMTP:[log in to unmask]] Sent: Tuesday, October 10, 2000 9:59 AM To: [log in to unmask] Subject: [TN] Heavy BGA's, now it's fine-pitch ! Hi Technet, I need your advice on this one: Some time ago there was a discussion about soldering problems with partnumberTMS320C6201GJC200 of Texas Instruments. It's a 1.27 mm pich BGA with a heavy heat-slug on top. The weight of the heat-slug makes the solderballs collapse a little too much, resulting in solder bridges. Now I've got to assemble some boards with similar parts, but with a much smaller ballpitch of only 0.8 mm. No problem for the ordinary type BGA's, but with the heatsink I'm starting to feel uncomfortable. For the record: it's TI's part numberTMX320C6203GLS. I've got to build two boards, and all I've got is two components. No trial and error possible...... If anyone of you have experience or thoughts about this, please let me know. Kind regards, Daan Terstegge SMT Centre Signaal Communications Unclassified mail Personal Website: http://www.smtinfo.net ---------------------------------------------------------------------------- ----- 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 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 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 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 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 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 ---------------------------------------------------------------------------------