Datasheet

Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
Electric Double Layer Capacitors (Gold Capacitor)
Application Guidelines (Gold Capacitor)
1. Circuit design
1.1 Product Life
The life of an electric double layer capacitor is limited. Its capacitance will decrease and its internal
resistance will increase over time.
The life of a capacitor greatly depends on the ambient temperature, humidity, applied voltage and
discharging currents. Capacitor life can be extended when these parameters are set well below the ratings.
The guaranteed durability of electric double-layer capacitors is between 1000 hours at 70 °C and 6000
hours at 85 °C. depending on product series. Generally, it is 1000 hours at 70 °C. The life of the capacitor
is guaranteed to be 16000 hours at a normal temperature (30 °C) by applying the acceleration double for
every 10 °C. Please choose the product that is suitable for the reliability that you need.
If your application incorporates this capacitor over a long period of time, then check it periodically and
replace it when necessary.
1.2 Polarity and voltage
Capacitors have polarities.
Do not apply a reverse or AC voltage. If a reversed voltage is applied to a capacitor for a long period of
time, then its life will be reduced and critical failures such as electrolyte leakage might occur.
Do not apply an over-voltage (a voltage exceeding the rated voltage).
If voltage exceeding the rating is applied to the capacitor for a long time, then its life will be reduced and critical
failures such as electrolyte leakage or physical damage due to gas generated by electrochemical reaction or
explosion might occur.
1.3 Circuits though which ripple currents pass
When using a capacitor in a circuit through which ripple currents pass, please note following matters.
(1) The internal resistance of electric double-layer capacitors is higher than that of electrolytic capacitors.
Electric double-layer capacitors may generate heat due to ripple currents.
(2) Please do not exceed the maximum operating voltage when the voltage changes from ripple.
(3) Because internal resistance is high, the gold capacitor is not basically suitable for the absorption of ripple
current.
1.4 Ambient temperature and product life
Capacitor life is affected by usage temperatures. Generally speaking, capacitor life is approximately doubled
when the temperature is decreased by 10 °C. Therefore, lower the usage temperature as much as possible.
Using capacitors beyond the guaranteed range might cause rapid deterioration of their characteristics and
cause them to break down. The temperature referred to here includes the ambient temperature within the
equipment, the heat produced by heat generating devices (power transistor, resistors, etc.), self-heating due to
ripple currents, etc. Take all of these factors into consideration when checking the capacitor’s temperature.
Do not place any heat generating devices on the back of the capacitors. Life acceleration can be
calculated with the following equation :
L
2
= L
1
×2
( )
L
1
: Life at temperature T
1
°C (h)
L
2
: Life at temperature T
2
°C (h)
T
1
: Category s upper limit temperature
T
2
: Ambient temperature to calculate the life + heat generation due to ripple current (°C)
✽ Humidity also affects the capacitor’s life. When using capacitors outside the following conditions, please contact us.
A temperature at +55 °C and a relative humidity of 90 % to 95% for 500 hours.
✽ The result that a very long term backup can be expected in calculation might be obtained by use conditions.
However, please consider checking regularly and exchanging it when using it for the set that long-term reliability is
basically demanded from the Gold Capacitor.
1.5 Voltage drop
Pay particular attention to the instantaneous working current and the voltage drop due to the capacitor’s
internal resistance when used in backup mode. The discharging current level is different depending on the
capacitor’s internal resistance. Use a capacitor with a discharging current below what is specified by the
corresponding capacitor.
Series
Max. Discharging Current
0.047 F or less 0.1 F to 0.33 F 0.47 F to 1.5 F 3.3 F to 4.7 F 10 F to 100 F
SG/SD/SE/NF/F 200 µA 300 µA 1 mA — —
RF
(–40 °C, –25 °C) — 300 µA, 3 mA 1 mA, 20 mA — —
LF (–40 °C) — — 1 mA — —
RG
(–40 °C, –25 °C) — 300 µA, 1 mA 1 mA, 20 mA — —
T
1
-T
2
10
Jan. 201705