FY0H104ZF Datasheet, PDF (11/14 Pages) Kemet Corporation – Supercapacitors FY Series

Supercapacitors – FY Series
Notes on Using Supercapacitors or Electric Double-Layer Capacitors (EDLCs)
1. Circuitry Design
1.1 Useful life
The FC Series Supercapacitor (EDLC) uses an electrolyte in a sealed container. Water in the electrolyte can evaporate while in
use over long periods of time at high temperatures, thus reducing electrostatic capacity which in turn will create greater internal
resistance. The characteristics of the supercapacitor can vary greatly depending on the environment in which it is used. 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 approximately 0.006 Fit. We estimate that unreported failures are ten times this
amount. Therefore, we assume that the fail rate is below 0.06 Fit.
1.3 Exceeding maximum usable voltage
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)
As supercapacitors contain a high level of internal resistance, they are not recommended for use as smoothing capacitors in
electrical circuits. Performance may be compromised and, in some cases, leakage or damage may occur if a supercapacitor is
used in ripple absorption.
1.5 Series connections
As applied voltage balance to each supercapacitor is lost when used in series connection, excess voltage may be applied to some
supercapacitors, 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 supercapacitor (partial pressure resistor/voltage
divider) when using supercapacitors in series connection. Also, arrange supercapacitors so that the temperature between each
capacitor will not vary.
1.6 Case Polarity
The supercapacitor 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.
1.7 Use next to heat emitters
Useful life of the supercapacitor will be significantly affected if used near heat emitting items (coils, power transistors and posistors,
etc.) where the supercapacitor itself may become heated.
1.8 Usage environment
This device cannot be used in any acidic, alkaline or similar type of environment.
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