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381LR151M420K012 Aluminum Electrolytic Capacitors

Introduction to Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are passive components that utilize electrolytes to increase their capacitance per unit volume. They consist of metal layers that are anodized or sputtered, and between these layers are electrical insulators that keep the capacitor’s voltage rating. The construction of the aluminum electrolytic capacitor has a low equivalent series resistance (ESR) value and high available capacitance when compared with other types of capacitors. Since they have an electric double layer effect, they can store electrical energy in it.

Application Field

The 381LR151M420K012 aluminum electrolytic capacitor is a device that is most commonly used in electronic circuits. It is designed for 250VAC applications and is available in various case sizes and styles. It is used for smoothing power supply ripple, storing energy for release on demand, creating a time delay, and harmonic filtering. With its high capacitance and low ESR value, it is ideal for high frequency circuits and power supplies. It is used in several different fields, such as automotive, industrial, medical, military/aerospace, and in applications requiring miniaturization.

Working Principle

The 381LR151M420K012 aluminum electrolytic capacitor works on the principle of a double layer capacitor. The basic construction of the device is made up of two metal layers, with a layer of aluminum oxide insulation between them. During the manufacturing process, the metal layers are treated and a chemical reaction takes place, forming a thin layer of oxide film on the surface. This oxide film acts as a capacitor dielectric and provides electrical insulation between the two metal layers. The electrolyte, which is a type of liquid, is sealed between the dielectric and metal layers, giving the aluminum electrolytic capacitor its high capacitance value. It acts as a reservoir for charge and when the voltage increases, additional current is stored in the electrolyte, thus increasing the capacitance. The capacitor is polarized and must be connected correctly in order to prevent electrical damage.

Conclusion

The 381LR151M420K012 aluminum electrolytic capacitor is an important component used in various electronic applications. It has a high capacitance per unit volume and a low equivalent series resistance, making it suitable for high frequency circuits and power supplies. This capacitor is typically polarized and must be connected in the correct direction to prevent electrical damage. With its high capacitance and low ESR, it is a popular choice for high voltage applications such as automotive, military/aerospace, medical, and industrial.

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