THe question is why does the connector shift? Is it due to warping of the connector, the board, oven or conveyor transport vibration, due to uneven melting of the solder- similar to tombstoning of chip parts- in the oven. We had a TO252 that would shift when it went into reflow because of uneven thermal mass connected to the pads. We added a water soluble mask across non soldered areas of the parts and then wash off the masking material. Don't get it on solder paste. Not elegant but it would work. my $0.02 worth Tom Gervascio Senior Process Engineer Sparton Electronics (352) 540-4040 >>> [log in to unmask] 11/03/04 01:39PM >>> Hi all, Looking for recommendations on ways to keep an SMT connector from shifting during reflow. This particular connector does not have any guidepost to help keep it in one place. Is there any special pad design that can be incorporated to help assist with keeping the part in place during reflow? The pads are currently rectangular shaped. Jim --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 1.8e 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 -----------------------------------------------------