Different locations, identical caps placed along and normal to the board. :-)
Regards,
Vladimir
----- Original Message -----
From: Allen Maddox <[log in to unmask]>
To: TechNet E-Mail Forum <[log in to unmask]>; Igoshev, Vladimir
Sent: Mon Jul 14 11:19:16 2008
Subject: Re: [TN] Ceramic caps
Just curious if there is any consistency in the size of the cap or it's place on the board and direction it faces?
It seems like you've covered all the obvious failures so far.
Allen Maddox, CID+
"Igoshev, Vladimir" <[log in to unmask]> wrote:
That was the first thing I asked and was told "No", they hadn't been re-worked or placed manually.
What bugs me the most is that I have a hard time imagining how a top half of a cap can be separated from the bottom one. If it wasn't a manufacturing problem, then how it should have been loaded (mechanically) to crack like that.
Regards,
Vladimir
----- Original Message -----
From: TechNet
To: [log in to unmask]
Sent: Mon Jul 14 10:39:57 2008
Subject: Re: [TN] Ceramic caps
In addition to the very good info you have already received, consider
how the caps are being soldered or reworked. I would check to make sure
none were soldered by hand using conventional solder irons. Rework such
as solder touchup should only be done with a hand-held hot air device
such as a Hakko or JVC.
Never, ever allow an MLCCC to be soldered with a conventional soldering
tool, as the sudden thermal shock will crack the body of the connector,
and/or the large heat transfer can melt the high-temp solder connections
internally (plate to terminal connections).
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Igoshev, Vladimir
Sent: Monday, July 14, 2008 8:08 AM
To: [log in to unmask]
Subject: [TN] Ceramic caps
Hi TechNeters,
I came across an unusual (at least to me) failure mode of ceramic caps.
They crack along the component body in either normal (from top all the
way through to the bottom), or parallel (from one side all the way
through to the other side) direction to the board the caps are mounted
on.
Has anyone seen something similar?
Thanks a lot in advance.
Regards,
Vladimir
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