Charles,

I did some trials in the mid 80's on (wave soldered) 1812 capacitors.
Severe solder fillet cracking was observed after 1000 cycles -55 to
+125 (compared with no observable damage to 1206 devices after 2000+
cycles). What was more surprising was that failures in a PCB bending
test (intended to act as greatly accelerated test) did not show a
dramatic difference between the two component sizes!

Little difference was observed in damp heat (85/85) test performance.

David Whalley

>I am researching concerns about the reliability of big surface mount
>discrete components (larger than 1812 capacitors / resistors).
>
>Are there any reliability issues involved in using these ?
>Are there manufacturability issues involved in using these ?
>We have experience with 0402 up to but not including 1812 discretes.
>
>Any technical references would be appreciated.
>Thanks.
>
>Charles Elliott

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