Ditto. I've seen this several times with bright tin plat Steve, Ditto. I've seen this several times with bright tin plated parts. Regards, George George M. Wenger Andrew Solutions Senior Principal FMA/Reliability Engineer 40 Technology Drive, Warren, NJ 07059 (908) 546-4531 (Office) (732) 309-8964 (cell) [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman Sent: Tuesday, June 23, 2009 8:22 AM To: [log in to unmask] Subject: Re: [TN] "Blumpie" looking connector leads... Hi Steve - ah, the beauty of being a materials engineer is that the industry doesn't seem to learn from past material mistakes so I really don't need to learn anything new! I recommend you check with your connector vendor to confirm that the connector surface plating is bright acid tin. The photos appear to show a bright acid tin surface finish that has blistered during the solder reflow process due to excessive co-deposited organic material. Bright acid tin finishes (plated correctly) look very nice but have terrible solderability characteristics and are a known tin whisker generation source. It appears that you may have had a surface plating change from what you normally had been procuring. Good luck. Dave Hillman Rockwell Collins [log in to unmask] Steve Gregory <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 06/23/2009 06:49 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Steve Gregory <[log in to unmask]> To [log in to unmask] cc Subject [TN] "Blumpie" looking connector leads... Morning all! Trying to stay cool here! Broke 100 degrees yesterday and Sunday, and it's probably going to break 100 degrees today. Summer has come with a vengeance! Ran across something yesterday that I've never seen before. We build a board that uses this AMP Densipac SMT connector: http://tinyurl.com/nqbpcp We've built a lot of these boards before without any issues at all. This latest run we have something going on with these particular connectors. Here's a photo of them on the PCB: http://stevezeva.homestead.com/files/AMP_Connectors.jpg You can probably see that the leads have this "Blumpie" look to them...both bumpy and lumpy. This is fresh out of the reflow oven. Here's a closer look: http://stevezeva.homestead.com/files/Connector_Blumpies.jpg If you notice the two pins either side of the white line look fine. They are the anchor pins that are for mechanical strength for the connector...they are not I/O pins. The rest of the board looks absolutely fine too. Not a bit of problem. It's just the I/O pins. We have noticed that connectors with certain date codes don't have this problem. Also, before reflow the connectors look okay. Luckily we've only built a few boards, and we're stopping until we can get to the bottom of this... Have any of you ever seen "blumpie" connectors like these before? Steve --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. If you have received it in error, please notify the sender immediately and delete the original. Any unauthorized use of this email is prohibited. ------------------------------------------------------------------------------------------------ [mf2] --------------------------------------------------- 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 -----------------------------------------------------