"DaveC" schreef in bericht
...
Trying to find a replacement for a 1F/2.5V supercap.

Original:

http://www.newark.com/cooper-bussman...super-1f-2-5v-
0-4ohm/dp/78K7800?Ntt=B0810-2R5105-R

I can find local replacements rated 1F/5V but the ESR is ~30 ohms instead
of
0.4.

I presume that supercaps aren't applied to filter applications -- their
specialty being an alternative to batteries to power memory or such -- so
ripple current shouldn't be an issue.

My question: what's the impact of replacing a supercap with one with a
higher
ESR?

Thanks,
Dave


Well,

As its says itself it's a Equivalent Series Resistor so it can be considered
a resistor in series with the capacitor. As such it dissipates some energy
during charging and charging takes some more time. On discharging the
resistor will also dissipate some of the energy and lowers the on the cap
available voltage by the voltage drop over the resistor. So a high ESR gives
a less power efficiency and will earlier be "empty".

petrus bitbyter