Hi David, 
Steve is out today, not feeling well. He may monitor his mail. 
But, there was a thread a couple of weeks back about tin and purple tint on
the surface of solder. 
It might be of interest. 
Guy

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David Bealer
Sent: Thursday, March 08, 2012 9:32 AM
To: [log in to unmask]
Subject: [TN] Discolored Leads on D-Case Tantalum Caps

I have some tantalum caps that the leads are so discolored (a brown to
purple tint to them) that the pick & place vision system is rejecting all of
them.  these are supposed to be 100% Sn plated, are MSL 3 rated, and these
are new parts straight out of the manufacturer's packaging with no signs of
breach.  The leads also will wet out using solder paste with OA flux.

If I can get the machine to place these what reliability issues could we be
facing?

I have a picture of several parts that I'll ask Steve to post.

David Bealer  |  SMT Department Manager
Phone: (217) 442-0611 ext. 6022  |  Fax: (217) 477-7134

Watchfire Signs by Time-O-Matic Inc.
[log in to unmask]<mailto:[log in to unmask]>
www.watchfiresigns.com<http://www.watchfiresigns.com/>

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