EKMM251VSN821MQ60S

Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are electrochemical capacitors, which use a solid electrolyte to store charge. They are the most common type of capacitors and are widely used in almost every electronics application due to their relatively large capacitance values and low cost. The letters ‘EKMM251VSN821MQ60S’ indicate the model of an aluminum electrolytic capacitor.

Application Field

Aluminum electrolytic capacitors are popularly used in the power supply circuits, smoothing out fluctuations in the voltage for devices such as LCD TVs, computers and automotive electronics. They are also used to couple amplifiers for regulators, audio stages, amplifiers, and filter circuits. They are used for high-frequency coupling and decoupling circuits, and for noise suppression. They can be used for both AC and DC.

Working Principle

Aluminum electrolytic capacitors are constructed of two aluminum electrodes that are separated by a paper spacer that has been impregnated with an electrolyte. An aluminum oxide film forms on the surface of the anode, resulting a large dielectric surface area to store charge. This can result in higher capacitance than other types of capacitors. The capacitance and life of the aluminum electrolytic capacitor depend on the type and quality of the electrolyte used. The rated voltage is determined by the quality and thickness of the dielectric oxide layer. As a rule, the higher the voltage, the thicker the oxide layer.

The capacitor works when a voltage is applied across its terminals. This causes an electric field to appear in the capacitor, causing electrons to flow through it, resulting in an electric current. The current leaves the positive terminal and enters the negative terminal, forming an electric field in the electrolyte. This electric field causes a rearrangement of charges on the electrodes and leads to the accumulation of charges in the dielectric material.

The accumulated charge creates a potential difference between the two electrodes, known as the capacitance. The capacitance of an aluminum electrolytic capacitor is determined by the type of electrolyte, the area of the electrodes, and the distance between them. As a rule, a higher capacitance requires a larger plate area and a higher working voltage.

Due to the conductive oxide layer on the surface of the anode, aluminum electrolytic capacitors have a limited amount of charge that they can hold. This charge is discharged when the voltage drops below a certain threshold, resulting in a decrease in the capacitance and increasing leakage current. This type of capacitor is not suitable for high-frequency applications.

Conclusion

Aluminum electrolytic capacitors are widely used in most electronics applications due to their ability to store large amounts of charge and relatively low cost. They are available in a variety of capacitance values and voltage ratings. The model \'EKMM251VSN821MQ60S\' is one of the many types of aluminum electrolytic capacitors available, and its use and working principle has been discussed in this article.