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Coin Cell Super Capacitors | Kemet

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Coin Cell Super Capacitors | Kemet

The Super Capacitor is the most outstanding capacitor concept to appear in the past decade. The large capacitance, slow rate of discharge and small package make it useful as a non-battery reserve power source that can provide currents (1-100 mA) and protect microcomputers from power shutdowns lasting several seconds. It is also useful for maintaining the contents of low dissipation volatile memories (i.e. CMOS) for several months.

The operating principle of the Super Capacitor is based on an electric double layer appearing at the interface between activated carbon particles and sulfuric acid solution as electrolyte. The two electrodes are separated by an ionically conducting but electrically insulating porous membrane.

Conductive rubber membranes contain the electrode and electrolyte material and make contact to the cell. Several cells are stacked in series to achieve the 5.5 V and 11 V rated voltages. Since the Super Capacitor exhibit relatively high ESR, it is not recommended for ripple absorption in DC power supply applications. In some manufacturing operations it has been polarized with the following voltage direction.

  • Shorter lead: Positive
  • Longer lead (connected to case): Negative

Therefore, the use of the Super Capacitor in that direction is recommended in actual usage.

The FC Series enables surface mounting, high rated voltage of 5.5V, and high reliability solution leakage.

The FG series includes small-size electric double-layer capacitors with excellent voltage holding characteristics.  The FG series are ideal as long-time backup devices for minute-current loads in small and lightweight systems.

The FR series Super Capacitors are small-size electric double-layer capacitors that can operate in a temperature range as wide as –40°C to +85°C. These capacitors are ideal as long-time backup devices for minute current loads in industrial equipment such as measuring instruments, control equipment, and communications equipment.

The FS series Super Capacitors are ideal as short-time (30 minutes max.) backup devices in small and lightweight systems. 5.5 VDC (0.022 F to 1.0 F), 11 VDC (0.47 F and 1.0 F only) and 12 VDC (1.0 F and 5.0 F only).

The FT series Super Capacitors are ideal as short-time (30 minutes max.) backup devices in small and lightweight systems. 5.5 VDC (0.10 F to 5.6 F)

The FY series includes small-size electric double-layer capacitors with excellent voltage holding characteristics. The FYD type occupies only a small area on a printed circuit board, and the FYH and FYL types feature a low profile in height, so that they can be used in various systems. These capacitors are ideal as long-time backup devices for minute-current loads in small and lightweight systems.

 

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