I think they are just sweating from the high speed data running through
them...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Tuesday, June 23, 2009 9:05 AM
To: [log in to unmask]
Subject: Re: [TN] "Blumpie" looking connector leads...
It's not dewetting of solder, more like a blistering/bubbling of the lead
finish. Try just heating a connector on its own and I suspect you will
generate the problem.
Blumpie is a great word BTW.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, June 23, 2009 12:49 PM
To: [log in to unmask]
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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