EEU-FC0J221

Aluminum Electrolytic Capacitors

Aluminum Electrolytic Capacitors are widely used in storages of electrical energy, power supplies of radio-frequency equipment, lightning-impulse current facilities, filters and electronics, since their capacitance range up to hundreds, thousands and even tens of thousands of microfarads. In this article, we are going to discuss about one particular model of aluminum electrolytic capacitors, the EEU-FC0J221, that finds its application field and working principle.

EEU-FC0J221 Application Field

EEU-FC0J221 is a small size radial leaded aluminum electrolytic capacitor series. These capacitors feature a compact body design with a high CV value and long life of 1000 hours to 3000 hours. Due to its compact body, it is widely used in audio equipment, like power amplifiers and portable radio, flyback transformers, AC inverter circuits, etc. Moreover, since its wide capacitance range of 10 μF to 220 μF and low E.S.R. (Equivalent Series Resistance) response, these capacitors are widely used in power supply and high power circuits. As a result, this series offers a cost-effective solution for applications where space is at premium, such as in digital cameras, DVD players and telecommunication equipments.

EEU-FC0J221 Working Principle

The principle of capacitor action is defined in the second law of thermodynamics, which states that charge must circulate between two points in order to create a current. In aluminum electrolytic capacitors, this principle is used to produce a capacitance. An aluminum oxide layer is formed on one electrode (usually an aluminum foil) and an electrolyte solution (usually an organic solvent) is present on the other electrode. This arrangement makes it possible for current (measured in coulombs) to circulate between the electrodes and thus a capacitance is produced.

The values of the capacitance and ESR (Equivalent Series Resistance) of the capacitors depend on the dielectric constant of the aluminum oxide layer. The ESR is proportional to the thickness of the oxide layer and thus as the oxidation layer increases, the ESR also increases. This makes it possible to achieve a great level of stability, since the ESR will not change too much with aging. Furthermore, since the aluminum oxide layer is self healing, these capacitors are known to have very long life expectancy.

Conclusion

EEU-FC0J221 is one of the most popular aluminum electrolytic capacitors of today. It finds its application in audio equipment, power amplifiers, AC inverter circuits and many other applications. The capacitance range is wide, from 10 μF to 220 μF, and offering a good ESR response. The working principle of this capacitor is based on the thermo-dynamic law, where an aluminum oxide layer acts as dielectric and an electrolyte solution produces the capacitance. Finally, the long life expectancy of this capacitor makes it a cost-effective solution for many applications.