ALF20C561EF400

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Aluminum electrolytic capacitors are widely used in electronic circuits and are indispensable components in modern electronics. ALF20C561EF400 is an advanced aluminum electrolytic capacitor which has gained wide popularity in recent years. This article will discuss the application field and working principle of ALF20C561EF400.

The ALF20C561EF400 aluminum electrolytic capacitors typically come in cylindrical cases with two copper terminals at both ends, connected to the aluminum foil inside. This capacitor is mainly used in AC circuits, and can also be used in DC circuits as well, mainly for the purpose of filtering and bypassing. It can help reduce high frequency noise while allowing normal AC signals to pass through. Other applications include power supply smoothing, line decoupling, and protection circuits, as well as electromagnetic compatibility.

The ALF20C561EF400 features an extended lifetime and stable operation in high temperature and humidity environments. It has an operating temperature range of -40～+125°C, a rated voltage of 400V, and a capacitance of 20 μF. The maximum ripple current ratings reaches up to 640 mA, making it suitable for applications with large current load demands.

The working principle of the ALF20C561EF400 is based on the electrolysis of aluminum, which is created when it is rolled into thin sheet. On the aluminum sheet, two thin oxide films are formed which act as the dielectric between the two metal electrodes. The oxide film contains two layers, the first being an ohmic layer and the second, a semiconductor-like layer. The presence of the semiconductor-like layer makes the device self-healing, which helps protect the capacitor from any damage due to excessive current.

When a voltage is applied to the capacitor, the electric current will flow from aluminum to the electrolyte. This generates aluminum ions, which are then absorbed by the oxide. This generates an electric double layer, which is responsible for storing energy and creating the capacitance. The capacitance of the ALF20C561EF400 is often referred to as its “volumetric capacitance” and is affected by various factors, such as temperature, frequency, and the thickness of the oxide film.

In conclusion, the ALF20C561EF400 is a high-quality aluminum electrolytic capacitor that can be used for a wide range of applications. It has excellent performance and is capable of withstanding a wide range of temperatures, voltages, and frequencies. It works by harnessing the combined properties of aluminum and electrolysis and is capable of storing large amounts of energy, thus allowing it to be used for AC and DC applications.

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