Sean,
Fortunately I don't understand your english so I'm blessed... :)

If you expect from your capacitor to filter the max ripple current as
well at 20C and at 105C you are very optimistic.

b) is the most plausible

My advice (based on 20 years of reading datasheets very carefully and
many times testing some parameters from datasheet):

NEVER EVER believe entirely the producer datasheet, any producer will
be. The producer is a humble human being. The datasheet writer also.
And the user too.

On 4/13/07, Sean Breheny <shb7@cornell.edu> wrote:
> Hi all,
>
> Can anyone tell me exactly what the temperature rating for aluminum
> electrolytic caps means? When the datasheet says 105 deg C max, which
> of the following (if any) does this mean:
>
> a) the capacitor will operate within specs (including max ripple
> current) when the ambient temp is 105 deg C (so the case could
> actually be 20 to 30 deg C hotter)
>
> b) the capacitor will operate within specs when the case is 105 deg C
> (so the ambient may need to be 20 to 30 deg C cooler if running at max
> ripple current)
>
> c) the capacitor will operate within specs when the maximum internal
> temperature (hot spot) is 105 deg C (very difficult to determine
> without more data from the manufacturer)
>
> Thanks,
>
> Sean
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