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March 2012

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Subject:
From:
Robert Kondner <[log in to unmask]>
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Date:
Tue, 6 Mar 2012 14:05:39 -0500
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It is not flux up on the leads by chance?  Does the brown scrape off?

Bob K.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jim West
Sent: Tuesday, March 06, 2012 1:03 PM
To: [log in to unmask]
Subject: [TN] Capacitors end termination discolored.

Hi all,

Take a look at the photo's at the below links (one shows picture of a new
cap).  I'm trying to figure out why the end terminations of a tantalum
capacitor (C37 and C38) are coming out of the reflow discolored.  In our
process, the middle boards of our panel have the discolored terminations.
The boards on the outside of the panel are all fine.  I think it's a heat
related issue, but I don't know why only the middle boards are affected.
All the solder joints are looking fine as well (even on the discolored
terminations).

Any thoughts as to what might be happening?  In your opinion, would your
reject these?

http://stevezeva.homestead.com/Discolored_Tant.jpg

http://stevezeva.homestead.com/New_Tant.jpg

Jim West







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