515D228M063FV6AE3

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Aluminum Electrolytic Capacitors

An aluminum electrolytic capacitor, often simply called an electrolytic capacitor, is a polarized capacitance electronic component with an aluminum foil as the anode, a metal oxide film as the dielectric, and a liquid or solid electrolyte as the cathode. It is also known as an Al-cap or simply a capacitor. The generic part number 515D228M063FV6AE3 is a common form.

Application Field

Aluminum electrolytic capacitors can be found in many modern electronic devices due to their small size, low price and good performance characteristics. Uses of these capacitors include:

• Audio and video equipment, such as televisions, speakers, microphones, and mixers.
• Home appliances, such as washing machines, vacuum cleaners, and refrigerators.
• Electronic equipment for telecommunication, such as cell phones and modems.
• Computers and peripherals, such as printers and scanners.
• Automotive systems, such as ignition systems, fuel injection systems, and vehicle electronics.

Working Principle

Aluminum electrolytic capacitors work by storing energy in an electric field between two large metal plates with a thin dielectric material in between. The thickness of the dielectric influences the capacitance of the capacitor, with a thin dielectric having a higher capacitance than a thick one. The electric field is created when a voltage is applied to the plates. If the plates have an electrolyte solution between them, the electrolyte solution also influences the capacitance because it acts as a current bridge to carry the electric charge from one plate to the other.

The electric charge stored in the capacitor can be discharged directly to the load or alternatively, it can be used to power an electronic circuit. When a voltage is applied to the capacitor, the electric charge accumulates on the metal plates. The amount of charge stored is proportional to the voltage applied. The stored charge can then be discharged directly to the load or used to power an electronic circuit.

Advantages And Disadvantages

The main advantage of the aluminum electrolytic capacitor is its high capacity for charge storage. This makes it ideal for applications where large amounts of energy need to be provided quickly. In addition, aluminum electrolytic capacitors are relatively low cost, making them suitable for use in a variety of applications. Aluminum electrolytic capacitors also have a low equivalent series resistance (ESR) compared to other capacitor types, further increasing their efficiency in applications where low losses are desired.

Unfortunately, aluminum electrolytic capacitors also have a number of disadvantages. They have a limited operational temperature range, which means they can only be used in applications where the temperature is within this range. In addition, they have a limited lifetime, usually 5-20 years depending on the type of capacitor selected. Finally, their construction makes them susceptible to moisture and corrosion, which can reduce their performance.

In summary, aluminum electrolytic capacitors offer a number of advantages and disadvantages, which must be considered when selecting a capacitor for an application. They can provide high capacity for charge storage, making them ideal for applications requiring fast energy delivery, and they also have relatively low costs. However, they have a limited operational temperature range and a limited lifetime, as well as a susceptibility to moisture and corrosion.

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