Hi Steve,

What's the silver content in your paste ?
I'd say by the looks that it is zero ,but I could be mistaken.
Personally , I think that a little silver would help the reflow process in this case.
And looking at the size of the component, it's going to be a hard job to reach the 25 % fillet.


Best regards,

Jowan  Iven
Process  Engineer  Manufacturing
Stork Electronics


-----Original Message-----
From:   Stephen R. Gregory [SMTP:[log in to unmask]]
Sent:   Thursday, September 07, 2000 3:49 PM
To:     [log in to unmask]
Subject:        [TN] Capacitor Fillets...

Mornin' All!

Well it's picture time again. We are running some boards this that uses a
ceramic multi-layer capacitor from Nippon Chemi-Con. We've noticed that the
fillets on these capacitors look different than what we've noticed before.
See the picture at:

http://www.driveway.com/share?sid=e25a88c4.8e904&name=Pictures

You can see that the fillet seems to climb partially up the termination and
then abruptly stop. The termination also has a sort of tarnished look to it.
I went to Nippon Chemi-Con's web page and looked up the part, and they say
the cap termination can be specified to be either silver or nickel barrier.

I've always thought that most ceramic caps do have nickel barrier
terminations, but then they would be finished with a tin/lead plating. Do you
think that in this day of lead free (especially since Japan is really pushing
for lead free electronics) that there's nothing but nickel on the
terminations? And if that is the case, what would you think of this solder
joint?

Thanks!

-Steve Gregory-

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