381LQ393M025K052

Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are a type of capacitor that uses an aluminum oxide layer as its dielectric, combined with a reasonably thick electrolyte solution of aluminum ions. Most electrolytic capacitors are polarized, meaning that they need to be connected the correct way around for the device to work properly. The most common type of aluminum electrolytic capacitor is the round can variety, which is also referred to as a “radial” capacitor.

The 381LQ393M025K052, which is an aluminum electrolytic capacitor from KEMET Corporation, is no exception. This device is a surface-mounted capacitor with an overall size of 0.400" x 0.600" and is entirely encased in a highly conductive aluminum shell, which is electroplated with a layer of gold. The 381LQ393M025K052 features a capacitance of 25μF, and its rated voltage is 63V.

Application Field

Aluminum electrolytic capacitors are widely used in a variety of electronic applications, such as in power supplies, DC-DC converters, DC motor drives, and audio equipment. In particular, aluminum electrolytic capacitors like the 381LQ393M025K052 are often used in high frequency switching applications where they help filter and stabilize power inputs. Furthermore, because this particular capacitor is surface-mountable, it can be easily used in higher density spaces.

Working Principle

The working principle of an aluminum electrolytic capacitor is based on the fact that when voltage is applied across an electrolytic material, ions are attracted to the surface of the material. These ions form a layer of oppositely charged particles, which act as the dielectric for the capacitor. When voltage is applied, the ions rearrange themselves to form a stable electrical field across the dielectric layer. As current moves through the capacitor, the ions rotate to help maintain the stability of the electrical field. This process of constantly adjusting the ions’ position allows the capacitor to store energy.

In addition to using oppositely charged ions, most aluminum electrolytic capacitors also use an anode and cathode. The anode is a layer of aluminum foil, which is covered in an aluminum oxide coating. The cathode is the electrolyte solution of aluminum ions. As current enters the capacitor, the anode acts as a repository for electrons, and the electrolyte solution helps to stabilize the electrical field.

Conclusion

The KEMET 381LQ393M025K052 is a radial aluminum electrolytic capacitor with a capacitance of 25μF and a rated voltage of 63V. It is generally used for high frequency switching applications, and its surface-mountable design makes it suitable for higher density applications. The working principle of aluminum electrolytic capacitors is based on the ionic behavior of aluminum oxide and electrolyte solution, which helps to create a stable electrical field.