●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.

●Please request for a specification sheet for detailed product data prior to the purchase.

●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.

2010.11.8 9565SCAVOL12E

36 Super Capacitors Vol.12

10.

Notes on Using Super Capacitor

(Electric Double-Layer Capacitor)

1. Circuitry design

1.1 Useful life

The electrical double layered capacitor (super capacitor) uses electrolyte and is sealed with rubber etc. Water in the

electrolyte can evaporate in use over long periods at high temperatures, thus reducing electrostatic capacity which in turn will

create greater internal resistance. The characteristics of the super capacitor can vary greatly depending on the environment

it is used in. Therefore, controlling the usage environment will ensure prolonged life of the part.

Basic breakdown mode is an open mode due to increased internal resistance.

1.2 Fail rate in the field

Based on field data, the fail rate is calculated at approx. 0.006Fit. We estimate that unreported failures are ten times this

amount. Therefore, we assume that the fail rate is below 0.06Fit.

1.3 Voltage application when maximum usable voltage is exceeded

Performance may be compromised, and in some cases leakage or damage may occur if applied voltage exceeds maximum

working voltage.

1.4 Use of capacitor as a smoothing capacitor (ripple absorption) in electrical circuits

As super capacitors contain a high level of internal resistance, they are not recommended for use as electrical smoothing

capacitors in electrical circuits.

Performance may be compromised, and in some cases leakage or damage may occur if a super capacitor is used in ripple

absorption.

1.5 Series connections

As applied voltage balance to each super capacitor is lost when used in series connection, excess voltage may be applied to

some super capacitors, which will not only negatively affect its performance but may also cause leakage and/or damage.

Allow ample margin for maximum voltage or attach a circuit for applying equal voltage to each super capacitor (partial

pressure resistor/voltage divider) when using super capacitors in series connection.

Also, arrange super capacitors so that the temperature between each capacitor will not vary.

1.6 Outer sleeve insulation

The outer sleeve wrapped around the super capacitor indicates that it is sealed, however the outer sleeve is not guaranteed

for insulation purposes. Therefore, it cannot be used where insulation is necessary.

1.7 Polar characteristics

The super capacitor is manufactured so that the terminal on the outer case is negative (-). Align the (-) symbol during use. Even

though discharging has been carried out prior to shipping, any residual electrical charge may negatively affect other parts.

1.8 Use next to heat emitters

Useful life of the super capacitor will be significantly affected if used near heat emitting items (coils, power transistors, and

posistors etc) where the super capacitor itself may become heated.

1.9 Usage environment

This device cannot be used in any acidic, alkaline or similar type of environment.