420USC120MEFC25X25

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Aluminum electrolytic capacitors (also known as “aluminum electrolytic caps” or “electrolytic caps”) are a very common type of capacitors, found in a wide variety of electronic circuits. They are used in power supplies and filters, motorized appliances, and digital control circuits.

Aluminum electrolytic capacitors are constructed from two aluminum foil electrodes separated by an electrically insulating dielectric layer of electrolyte. These capacitors are polarized and must be connected correctly in a circuit. The capacitors store energy while the aluminum foil serves as the anode. The electrolyte then acts as the dielectric material between the anode and cathode, with a plastic film or paper dielectric in between.

The most common types of aluminum electrolytic capacitors are radial and axial leaded capacitors. Radial leaded capacitors have a cylindrical body shape, with the leads emerging from the top and bottom. Axial leaded capacitors have two leads emerging from one side of the body. Each type of capacitor has its own application and design benefits.

The working principle of aluminum electrolytic capacitors is relatively simple. When a voltage is applied across the cap, the aluminum foil acts as the anode, and the electrolyte acts as the dielectric material between the anode and cathode. As the current passes through the component, the electrons are attracted to the aluminum foil, forming an electrical double layer on the surface. As the current continues to flow, the capacitance of the component increases. The capacitor thus acts as a form of energy storage.

The application fields of aluminum electrolytic capacitors are broad. They are commonly used in applications such as power supplies, motorized appliances, and digital control circuits, as well as in the protection and filtering of audio signals. The capacitance of the capacitor can range from several microfarads to several farads, depending on the size and design of the component. The most popular types of aluminum electrolytic capacitors include the 420 USC 120 MEFC (Micro Electrolytic Film Capacitor) with a 25x25mm case size and the 105 MFC (Miniature Aluminum Electrolytic Capacitor) with a 10x15mm case size.

In conclusion, aluminum electrolytic capacitors are an important and versatile component in many electrical and electronic circuit designs. They are often used in power supplies and filters, motorized appliances, as well as in digital control circuits and audio signal protection and filtering. The capacitance of these components can range from several microfarads to several farads, and the most popular case sizes are 25x25mm and 10x15mm.

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