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I need to replace these (what I think are) capacitors, but the rating seems very high. They are smaller than the tip of my finger, yet the label pretty clearly says 0.33F, 5.5V. This seems wrong, as in my experience, even caps in the range of 100's of μF are physically much larger. A precursory search on DigiKey doesn't show anything similar. Is this some type of special capacitor, or not even a capacitor at all?

The Cap The rating

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    \$\begingroup\$ It is a super cap \$\endgroup\$
    – DKNguyen
    Commented May 9, 2020 at 21:33
  • \$\begingroup\$ Typing "0.33f 5.5v 10mm" into Google finds several reputable distributers that sell similar parts. Product recommendations are however off topic. \$\endgroup\$
    – Tom Carpenter
    Commented May 9, 2020 at 21:35

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That's what's known as a Supercapacitor.

They have specialized uses, most commonly as energy storage for real-time clock/calendars or retaining data when the power is off or the main battery is being changed.

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  • \$\begingroup\$ Yeah, thats exactly what it was being used for. Thanks a lot. \$\endgroup\$
    – 7265469843
    Commented May 9, 2020 at 21:47

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