Who is going to get blumpie into a company spec?
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tan Geok Ang
Sent: Wednesday, June 24, 2009 3:17 AM
To: [log in to unmask]
Subject: Re: [TN] "Blumpie" looking connector leads...
Observed that solder joints between pictures seems different (Lead-free
and leaded). Even the good one, seems to have "Blumpie" at the high end
of those pins. I believed that plating of the pins, solder volume and
temperature are factors on this issue.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, 23 June 2009 10:43 PM
To: [log in to unmask]
Subject: Re: [TN] "Blumpie" looking connector leads...
So far, we've isolated down to one datecode, and we have quite a few of
the bad date code. Problem is, we've had these in stock for a while, and
I don't know if anybody is going to pony up and take responsibilty for
them and replace them for us.
Here's what the other datecodes look like:
http://stevezeva.homestead.com/files/Good_DensiPac.jpg
Just a little better looking huh?
Steve
________________________________
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Tuesday, June 23, 2009 7:22 AM
To: TechNet E-Mail Forum; Steve Gregory
Cc: [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
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Steve Gregory <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
06/23/2009 06:49 AM
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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
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