B32621A0332K289

Film capacitors, also known as polyester capacitors, are electronic components consisting of flat sheet-like polyethylene terephthalate (PET) dielectric sheets. They are widely used in many kinds of applications, including electronic circuits, and are particularly well-suited for high-frequency and high-sensitivity applications. In this article, we will discuss the application field and working principle of the B32621A0332K289 film capacitor.

Application Field

The B32621A0332K289 is a comprehensive metallized polyester capacitor designed for general purpose, high frequency, and RF applications including audio equipment, TV sets, radios, power and lighting line filters, and instrumentation. It is capable of operating at frequencies of up to 500 MHz, has a maximum temperature range of - 55°C to + 125°C, and is available in a radiation hard, derated UL-94V-0 case. The tight capacitance tolerance and long life make it suitable for industrial and consumer applications.

Working principle

When a voltage is applied across a film capacitor, an electric field is produced in the dielectric material (around the metal layer). This electric field creates a charge separation and thus generates a polarization. This results in a current that flows through the connections of the film capacitor and a voltage drop at the terminals corresponds to the stored charge. The capacitance of the film capacitor is defined by the area of the electrodes, thickness of the dielectric material, and the dielectric constant of the material itself. With a given voltage applied across the device, the amount of charge stored and the amount of current is proportional to the capacitance.

Conclusion

The B32621A0332K289 film capacitor is a widely-used, high-performance capacitance device suitable for a variety of applications. Its wide range of operating temperatures, tight capacitance tolerances, and long life make it an ideal choice for many industrial and consumer applications. It is capable of operating at frequencies up to 500 MHz. Understanding the basic working principle of film capacitors can help the user determine its optimal performance and settings for a given application.