I would run a profile with a thermocouple right next to the discolored caps and compare it to the component datasheet.

Best regards,
Raye Rivera
 
 
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jim West
Sent: Tuesday, March 06, 2012 10:03 AM
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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