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November 1999

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Subject:
From:
Tom Burek <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 10 Nov 1999 20:26:10 -0500
Content-Type:
text/plain
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text/plain (65 lines)
I heard that cracks on the corners could be an indication of a CTE mismatch with the solder joint and the component.  It may be that there is too much solder around the cap.  The solder does not expand the same as the component or PCB thus causing a crack at the corner.  A smaller pad is suppose to help in these situations.  Check out the MuRata catalog C-22-B.
Tom

 -----Original Message-----
From: [log in to unmask] [SMTP:UNIX :[log in to unmask]]
Sent: Wednesday, November 10, 1999 1:22 PM
To: [log in to unmask]
Subject: [TN] 1812 capacitors on FR-4

 << File: ENVELOPE.TXT >>
 --------------------------------------------------------------------------  --
        -----Ursprüngliche Nachricht-----
        Von:    Matthew Lamkin
[SMTP:[log in to unmask]]
        Gesendet am:    Freitag, 25. Juni 1999 09:26
        An:     [log in to unmask]
        Betreff:        Re: [TN] FW: What it would be like living in
Australia

        Well I don't know about being a joke, but I've saved it as a handy
        little utility.
        By selecting it from my start menu I can now turn a PCB that I am
        working on upside down to view it from another angle.

        Something that I have occasionally wanted to do. I can remember
actually
        going as far as turning the monitor on its side
        before, just so that I could view something from a different angle
        without upsetting everything else in the PCB file.... <g>
Hi technos, we have some problems with 1812 (and also with 1210)
capacitors
on FR4 because cracks at the corner. Is there any size limit for SMT cap's
on FR4 (may be different classed for different application temperatures)?
Thanks, Bernhard, Zürich

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