I would be treating it as a high temp BGA or CGA. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Nowland, Russell Howard (Russell) Sent: Monday, March 22, 2010 3:57 PM To: [log in to unmask] Subject: [TN] TI/Emerson SMT Board Mounted Power Hello Technetters, I have a problem I hope someone out there has a solution for. I have on a PCA that uses a Texas Instrument/(Emerson Power/Artesyn) (dual sourced but part of the POLA) SMT board mounted power converter. The MPN is PTH03050WAS. It is actually combination PTH and SMT. The device has 40 mil diameter pins for PTH and to make it SMT they simply add a donut (solder dam) on the pin and round the edges and call it a solder ball. I think the problem my EMS is having is really with pick-n-place because the pick-up point (Actually the top of a transformer) is off-center, fairly small, and it has a plastic label on it. The problem is the device is coming out of the oven skewed and violating IPC 610D. The pad diameter is exactly what is recommended by the datasheet (.085-inches). The TI datasheet recommended a 0.080-0.085 diameter aperture @ six mils. Originally my EMS had 0.085-inch @ 5 mils but changed the aperture to a bull's-eye shape with the thought the bull's-eye would help center the device. Both of the stencils have failed to draw the device to the center. Because this is really a Butt Joint I am holding the EMS to no side overhang. This is causing them quite a headache. They have also not come up with a viable solution either. Here is the link to the data sheet http://www.emerson.com/sites/network_power/en-US/Products/Product_Detail/Pro duct1/Documents/PTH03050%20DC-DC%20Converter/PTH03050%20Data%20Sheet.pdf Has anybody used these devices with good results? If so can you share your methodology? Thanks in advanced, Russell Nowland Alcatel-Lucent Advanced Manufacturing Engineer Address: 14000 Quail Spring Parkway, Suite 300 Oklahoma City, OK 73134 email: [log in to unmask]<mailto:[log in to unmask] > Desk: 405-302-1660 Cell: 405-203-0034 Fax: 405-302-1622 ______________________________________________________________________ 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 -----------------------------------------------------