So, this manufacturer does not have control on his process and asks you to accept discolored leads. Strange arguments. I have decades of experience behind and I have seen that LEAD FINISH is one of the most frequent failure sources.Just be careful. Inge On 2 April 2012 22:23, David Bealer <[log in to unmask]> wrote: > Update: > > The manufacturer has replied that the discoloration is a normal result of > their aging process which uses heat and humidity (these are not Tantalum > caps but a Polymer Aluminum equivalent). They stressed that the discolored > leads are still solderable, and as such were not defective. > > > 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] > www.watchfiresigns.com > > -----Original Message----- > From: David Bealer > Sent: Thursday, March 08, 2012 12:56 PM > To: 'TechNet E-Mail Forum'; 'Steve Gregory' > Subject: RE: [TN] Discolored Leads on D-Case Tantalum Caps > > I had the same thought - that the parts are "recycled". These are not > Vishay. The distributor certifies that these are genuine, and we have now > gotten the manufacturer involved. They will have samples in their hands > tomorrow so hopefully we will have this all cleared up shortly. > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory > Sent: Thursday, March 08, 2012 12:23 PM > To: [log in to unmask] > Subject: Re: [TN] Discolored Leads on D-Case Tantalum Caps > > Hi David, > > Sorry about not getting this posted earlier, but I have not been feeling > well today, and just got around to checking my email. I have your picture > posted now though: > > http://stevezeva.homestead.com/discolored_leads.jpg > > I think what guy was referring to was a thread from a while back that I > started about a purplish tint that I saw with some SAC305 solder on a gold > plated board. Here was the picture: > > http://stevezeva.homestead.com/Trippy_Solder.jpg > > George Wenger was interested in analyzing it for me, and this was his > report: > > http://stevezeva.homestead.com/FSC-5178.ppt > > But what I see with your caps is different I think. The purplish tint that > you are seeing maybe some of same sort of oxide that was in the SAC305 > solder that I saw, but I find it hard to believe that the manufacturer > would ship tantalum capacitors looking like that. I've seen many, many > reels of tantalum capacitors, and I can say that I've never seen them come > from the manufacturer looking like this. Do these happen to be Vishay? > > One of the things that come to my mind is that these may be counterfeit. > They almost look like they've been pulled off boards. You say that they're > straight out of the manufacturer packaging, but where did you actually > purchase them from? > > Just from the picture, I would be suspect of these parts... > > Steve > > > -----Original Message----- > From: Guy Ramsey > Sent: Thursday, March 08, 2012 10:36 AM > To: [log in to unmask] > Subject: Re: [TN] Discolored Leads on D-Case Tantalum Caps > > 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/> > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. 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