Some vendor got two termination for cap, solder able or silver epoxy attached one. Sounds like someone took the wrong type. Noble metal finishing termination most likely not intend to be soldered.
From Z10 with efficiency.
Original Message
From: Guy Ramsey
Sent: Wednesday, June 4, 2014 6:38 AM
To: [log in to unmask]
Reply To: [log in to unmask]
Subject: Re: [TN] השב: [TN] Capacitor - strange soldering behavior
No nickel?
http://www.johansondielectrics.com/technical-notes/product-training/basics-o
f-ceramic-chip-capacitors.html#.U47yS_ldXK0
I was going to suggest a thin coating of solder resist. But, it sounds like
this is part specific.
Hummm.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Zilber Gil
Sent: Monday, June 02, 2014 3:18 PM
To: [log in to unmask]
Subject: [TN] השב: [TN] Capacitor - strange soldering behavior
The XRF indicate Sn, Pb and Cu.
Thanks
-------- הודעה מקורית --------
מאת: "Wenger, George M. [Contractor]"
תאריך:02/06/2014 6:16 PM (GMT+02:00)
אל: TechNet E-Mail Forum ,Zilber Gil
נושא: RE: [TN] Capacitor - strange soldering behavior
What did the XRF indicate?
Regards,
George
George M. Wenger
Failure Signature & Characterization Lab LLC
609 Cokesbury Road, High Bridge, NJ 08829
(908) 638-8771 Home (732) 309-8964 Mobile E-mail [log in to unmask]
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Zilber Gil
Sent: Monday, June 02, 2014 11:13 AM
To: [log in to unmask]
Subject: Re: [TN] Capacitor - strange soldering behavior
XRF was done on a new part before reflow. Before reflow the surface was
shine. After reflow it was grayed and porous as seen in the picture.
Thanks,
Gil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Monday, June 02, 2014 6:06 PM
To: [log in to unmask]
Subject: Re: [TN] Capacitor - strange soldering behavior
Would XRF plating alloy identification work here on a loose part?
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David Hillman
Sent: Monday, June 02, 2014 9:36 AM
To: [log in to unmask]
Subject: Re: [TN] Capacitor - strange soldering behavior
Hi Gil - two questions: (1) Does the capacitor have a barrier layer of
copper or nickel to prevent the underlying metallization from leaching into
the solder joint?; (2) Have you completed a cross section to assess the
solder joint microstructure?
Dave Hillman
Rockwell Collins
[log in to unmask]
On Thu, May 29, 2014 at 9:01 AM, Zilber Gil wrote:
> Hello Technet,
>
> While soldering this ceramic capacitor (
> http://ipc-technet.groupsite.com/gallery/27235), its looks like that
> the capacitor suck the solder from the PCB`s pad to the capacitor pad
> and the color is now grayish and porosity. XRF found Sn, Pb, Cu on the
> capacitor pad. PCB Solderability was good and the profile was SnPb at
> 225 deg C under Nitrogen. Other capacitors and components on the board
> look normal with shine soldering.
> Can anybody seen something like that before? Any ideas?
>
> Thanks and have a wonderful weekend.
>
> Dr. Gil Zilber
> Technologist, Elta system Ltd.
>
>
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