Hi!
There are many problems with thermal mismatch and mechanical handling , as
all our friends have mentioned. The first nono I know, if you dare to ignore
them, is -don't put the large ones through wave soldering. Most chip
capacitor manufacturers give charts in their catalogs , in which you can see
if your choice of capacitor is good according to your process. They give you
also reflow profiles , pad size, a.s.o.
I don't want to play the all knowing person to you. We had the same problems
and changed component size, designs, handling procedures.
Good Luck!
Gaby

> ----------
> From:         Wanner Bernhard[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Wanner Bernhard
> Sent:         ?יום רביעי 10 נובמבר 1999? 18:57
> To:   [log in to unmask]
> Subject:      [TN] 1812 capacitors on FR-4
> 
>         -----Ursprungliche 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, Zurich
> 
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