Datasheet

Radial Super Capacitor
RND is a trademark of Distrelec
Figure 4–Circuit for a.c. resistance method
Measuring method
The internal resistance Ra of a capacitor shall be calculated by the following formula:
Ra is the a.c. internal resistance (Ω)
U is the effective value of a.c. voltage (V r.m.s.)
I is the effective value of a.c. current (V r.m.s.)
The frequency of the measuring voltage shall be 1 kHz The a.c. current shall be from 1 mA to 10 mA
equipment: Internal resistance tester
Preauctions for use
Supercapacitors cannot be used in the following states:
a) temperature above the nominal temperature
When the temperature of the capacitor exceeds the nominal temperature, it will cause the electrolyte to decompose, and
the capacitor will heat up and the capacity will drop
Moreover, the internal resistance is increased and the life is shortened.
b) voltage exceeding the rated voltage
When the capacitor voltage exceeds the nominal voltage, it will cause the electrolyte to decompose, and the capacitor
will heat up and the capacity will drop
Moreover, the internal resistance is increased and the life is shortened. Therefore, reducing the voltage used can increase the
service life.
c) loading of reverse voltage or alternating voltage
2. Influence of ambient temperature on supercapacitors
The service life of supercapacitors is affected by the temperature of use. Under normal circumstances, the temperature of the
supercapacitor is reduced by 10 °C, and the life of the supercapacitor is shortened by half. Try to use it in a low temperature
environment below the maximum operating temperature. If it is used beyond the maximum operating temperature, the
characteristics may deteriorate rapidly and be damaged.
The temperature of the supercapacitor should be determined not only by the temperature around the device, but also by the internal
temperature. The radiant heat of the heating element (power transistor, resistor, etc.) in the device and the self-heating temperature
caused by the ripple current are also confirmed. Also, do not install the heating element near the supercapacitor.
3. Please use the positive and negative signs of the capacitor correctly.
4. Please avoid using super capacitors in the following environments.