861221485012

Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are among the most important components in modern circuit design. They are widely used in all RF, audio, digital, and power electronics applications, providing high capacitance, long shelf-life, and low cost. In this article, we will discuss the application field and working principle of the 861221485012-type aluminum electrolytic capacitor.

Application Field

The 861221485012 type aluminum electrolytic capacitor is typically used in DC input voltage applications, such as power supplies, industrial equipment, and automotive electronics. It is also used for frequency compensation in AC circuits and for filtering and coupling in audio applications where low ripple current is desired. In addition, it is also used as an energy storage device in pulse power systems.

Working Principle

An aluminum electrolytic capacitor consists of two aluminum foils with oxidized surfaces, separated by a porous paper soaked in an electrolyte. The aluminum foils form the plates of the capacitor, while the electrolyte provides the additional dielectric. This type of capacitor contains a low-resistance element which is formed by the electrolyte. The plates are connected to the external leads. When the capacitor is charged, electric field is formed between the plates, forcing the electrolyte ions to gather around the plates. This forms a double-layer of electric charges, with one layer near each of the plates. This dielectric doubles the capacitance of the structure and increases its capacitance value.

Aluminum electrolytic capacitors can be found in a variety of shapes, sizes, and ratings. The larger the capacitor\'s size, the greater its capacity. The typical range of capacitance for this type of aluminum electrolytic capacitor is from 0.1uF to 22uF, which is suitable for most applications requiring this type of capacitor.

The 861221485012 type aluminum electrolytic capacitor has a high ripple current rating, making it suitable for use in power supplies and audio applications. It also has a high surge voltage capability, making it suitable for surge and transient applications such as power controllers, motor control circuits, and power supplies. The rated life of this type of capacitor is between 2000 - 5000 hours, depending on its temperature and voltage.

In summary, the 861221485012 type aluminum electrolytic capacitor is a versatile and robust type of capacitor that is suitable for a variety of applications. It is especially suited for DC input voltage applications, frequency compensation in AC circuits, filtering, and coupling in audio applications, and as an energy storage device in pulse power systems. Its high ripple current rating, large capacitance range, and high surge voltage capability make it the ideal choice for many applications.