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April 2007

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Subject:
From:
Chris Ball <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 18 Apr 2007 08:20:03 -0400
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I have no documentation on specific problems that may have caused the 
creation of this guideline. The failure mode is a cracked cap. Usually 
doesn't show up in ICT but fails short later (normal X7R, not open mode 
part).




Wayne Thayer <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
04/18/2007 08:01 AM
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Subject
Re: [TN] Panellization query -- need urgent inputs






Chris-

Do you have any documentation on what the failure mode is on the X7R
caps?  The board stress due to the shear wheel doesn't look like much to
me.  We had some X7R parts fail by shorting in the vicinity of a score
line, but ended up attributing it to voltage stress, not physical
stress.  We are certain that the shear wheel didn't contact the part.

Wayne Thayer

>>> [log in to unmask] 4/18/2007 7:51:25 am >>>
Depends,,, X7R caps should be way far. We say 7MM in our guidelines but

can't always comply. Orientation is also a factor. Parallel is better
than 
perpindicular (to the Vscore. Same caps from different sources can make
a 
difference too. 

Our general rule is 3.5MM but again, it's not always possible and
doesn't 
always cause a problem when closer.

-Chris




pras chop <[log in to unmask]> 
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04/18/2007 05:06 AM
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pras chop <[log in to unmask]>


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Subject
[TN] Panellization query -- need urgent inputs






Hi,
 
  Need help to know as what is the latest DFM guidelines for the 
spacing of the components from the V-score.
 
    We are using a V-groove for panellization. So, what should be the 
minimum distance of the components from the V-groove so as to avoid 
component damage or cracking during the depanilization using pizza
cutter.
 
  Thanks in advance to all for help.
 
  Rgds

 
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