Yes, Dave is right. I had them too and had fun popping the big ones.
See that the leads which are at the ends of the part-look like mounting
spacers- don't have this defect because they are from a different batch of
leads and are OK.
There is a big chance that leads with this defect would have been OK for
through hole mounting and would have passed without detection of the plating
with excess of organic brighteners .
Gaby

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: ו 06 אוגוסט 2010 20:54
To: [log in to unmask]
Subject: Re: [TN] blumpy

Hi Chris!

Looks just like what I had back in Tulsa. I started calling what I saw
"Blumpy" (bumpy + lumpy = blumpy) ;^)

http://stevezeva.homestead.com/files/Connector_Blumpies.jpg

Dave Hillman and a few others said that it was co-deposited organics from
bright tin plating.

To me, the solder joints in the picture look like "head-in-pillow" joints. I
wouldn't accept them and I would reject the parts back to the vendor. The
part looks like a TI part. I thought TI was plating their leads with
palladium and not tin though...

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Friday, August 06, 2010 1:35 PM
To: [log in to unmask]
Subject: [TN] blumpy

So a customer has the blumpies (see link to pictures below).  The hand (dry)
solder melt-front smokes like a freight train under the microscope.

My questions are:

Have we really coined "blumpy"? and
If it wets and forms proper fillets, is it conformant?

Thanks!
Chris


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