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/>
>
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