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ALUMINUM ELECTROLYTIC CAPACITORS
?
Cautions for Using Aluminum Electrolytic Capacitors
Please read product specifications before using ELNA products.
The following cautions should be observed when using our aluminum electrolytic capacitors to assure their maximum
stability and performance. When your application design conditions or operating conditions exceed the limit of the
product specification, please contact us. If used under conditions beyond the limit of our specifications, it may cause
defects such as short circuit, open circuit, leakage, explosion or combustion.
Cautions for usage
1. DC electrolytic capacitors are polarized.
? If used with a wrong polarity, it creates an abnormal
current resulting in a short circuit or damage to
itself. Use DC bipolar electrolytic capacitors for use
with uncertain or unknown polarity. DC capacitors
cannot be used in AC circuits.
2. Use within the rated voltage.
? If a voltage exceeding the rated voltage is applied,
it may cause characteristic deterioration or damage
due to the increased leakage current.
? When ripple current is loaded, make sure that the
peak value of the ripple voltage does not exceed
the rated voltage.
3. Using for power supply circuit.
? While aluminum electrolytic capacitors are operated
electrolyte liquid inside dries up and E.S.R.
(Equivalent Series Resistance) of the capacitor
increases. In case operated longer than rated life
time, the capacitance much decreases, tangent of
loss angle and E.S.R. much increases. Therefore
for some case the sum of bias direct voltage and
the peak of ripple voltage is over the rated voltage
of the capacitor.
? For any type of circuit, in case the sum of bias
direct voltage and the peak of ripple voltage is over
the rated voltage of the capacitors or in case the
minimum voltage is lower than 0 (zero) volt, the
voltage control for the capacitors shall be provided.
4. Do not use in a circuit which requires rapid
charging or discharging.
? If used in a circuit requiring rapid charging or dis-
charging, it may cause characteristic deterioration
or damage to itself due to the heat generated inside
the capacitor. In such cases, contact us for our
rapid charging / discharging capacitors.
the characteristics are not deteriorated by remaining
at a high temperature for a long time). If used at a
temperature exceeding the guaranteed temperature
range, the capacitor may be damaged due to the
increased leakage current. Pay attention to the
capacitor temperature being affected by the ambient
temperature of the unit, the temperature inside the
appliance, the heat radiated by another hot component
in the unit and the heat inside the capacitor itself due
to the ripple current.
(1)The electrostatic capacitance is normally shown
as the value at 20°C-120Hz. It increases as the
temperature raises and decreases as it lowers.
(2)The tangent of loss angle (tan δ ) is normally
shown as the value at 20°C-120Hz. It decreases
as the ambient temperature gets high and
increases as it gets low.
(3)The leakage current increases as the tem-
perature gets high and decreases as it gets low.
7. Changes in the characteristics due to frequency.
? The characteristics of an electrolytic capacitor will
change according to the change in the operating
frequency.
(1)The electrostatic capacity is normally shown as
the value at 20°C-120Hz. It decreases as the
frequency increases.
(2)The tangent of loss angle (tan δ ) is normally
shown as the value at 20°C-120Hz. It increases
as the frequency gets high.
(3)The impedance is normally shown as the value at
100kHz 20°C. It increases as the frequency lowers.
8. Aluminum electrolytic capacitor life.
? The life of an aluminum electrolytic capacitor termi-
nates when it fails due to the deterioration in its
electronic characteristics. Temperature and the
ripple current since they especially affect the life.
See chart on page.
5. Use within the rated ripple current.
? If applied ripple current exceeds rated ripple current,
the life of the capacitor may be shortened, or in an
extreme case it gets destroyed due to its internal heat.
Use high-ripple type capacitors for such circuits.
6. Changes in characteristics due to operating
temperature.
? The characteristics of an electrolytic capacitor will
change with a change in the temperature. Such
changes are temporary and the original characteris-
tics will be restored at the original temperature (if
CAT.No.2008/2009E(2008.10.1)
9. Changes in aluminum electrolytic capacitors
during storage.
? After storage for a long period, whether unused of
mounted on the appliance, the leakage current of
an aluminum electrolytic capacitor will increase.
This tendency is more prominent when the ambient
temperature is high. If a capacitor has been stored
for more than 2 years under normal temperature
(shorter if high temperature) and it shows increased
leakage current, a treatment by voltage application
is recommended. Addition of a protective circuit in
NOTE
Design, Speci?cations are subject to change without notice.
Ask factory for technical speci?cations before purchase and/or use.
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