7

SCC Series

High Capacitance Cylindrical SuperCapacitors

TDS-SC-0001 | Rev 1

TEST METHODS (continued)

MAXIMUM CONTINUOUS CURRENT

• This is the maximum current when temperature rise of the supercapacitor during its operation is less than 15°C

MAXIMUM PEAK CURRENT

• This is the maximum current during 1 second time interval (dt)

WATT DENSITY

• Watt Density = (0.12*V2 / R

DC ) / mass

ENERGY DENSITY

• Energy Density = (½ CV2) / (3600*mass)

POLARITY AND REVERSE VOLTAGE

For product consistency and optimum performance, it is recommended that the capacitor be connected with polarity indicated. Reversing polarity could result

in permanent damage to the circuit including much higher leakage current for a short duration of time and the life time of the supercapacitors will be reduced.

LIFE TIME AND TEMPERATURE PERFORMANCE

The life of a supercapacitor is impacted by a combination of operating voltage and the operating temperature according to the following

Time to Failure equation:

t

∝Vn×e(−Q)kT

where V is the operating voltage, Q is the activation energy in electron volts (eV), k is the Boltzmann constant in eV, and T is the operating temperature in Kelvin

(K). Typical values for the voltage exponent, n, is between 2.5-3.5, and Q is between 1.0-1.2 eV in the normal operating temperature range of -40° to 65°C.

The industry standard for supercapacitor end of life is when the equivalent series resistance, ESR, increases to 200% of the specified value and the capacitance

drops by 30% from specified value. Typically a supercapacitor shows an initial “jump” in the ESR value and then levels off. If the supercapacitors are exposed

to excessive temperatures the ESR will show a continuous degradation (increase). In the extreme case, if the temperature or voltage are substantially higher

than the rated specifications, this could result in the part venting and the product showing a faster degradation of capacitance and ESR, which may be many

times the specified value.

– supercapacitors –

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available

online at www.kyocera-avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.