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Film Capacitors

BFC233824684 Application Field and Working Principle

Film capacitors are on-state components, used in a wide range of applications, from low-frequency circuits for signal coupling and bypassing to high-end communication and data processing applications. The product range covers miniature AC capacitors, AC metallized film capacitors, radial and snap-in metallized DC capacitors, Y2-rated DC capacitors and others.

The BFC233824684 product, for example, is a 300VAC series radial metallized film capacitor with a housing diameter of 15.5+/- 0.5mm. It offers a dielectric constant of approximately 2.2 and an insulation resistance of 100MΩ. This series is generally used for applications such as high-frequency resonant power supplies, DC-DC converters, switching converters and SMPS.

Working Principle

At the heart of the BFC233824684 product lies a metalized polypropylene film as the dielectric, which has an extremely high insulation resistance. It is furthermore highly resistant to chemical and atmospheric influences. This imparts to the capacitor an extended service life.

When a voltage is applied across the BFC233824684 terminals, the metalized edge regions create charge carriers by ionization, due to the high electric field strength at the edges of the dielectric. This creates a charge storage layer on the film, which is picked up by the metal electrodes and stored in the form of an electric field with no leakage current. This electric field creates a capacitance, storing electric energy.

Advantages

One of the great advantages of Film Capacitors, such as the BFC233824684, is their high pulse current capability, whereas electrolytic capacitors, which are primarily designed for power supply applications, are limited in this area. Film Capacitors also have the advantage of extremely low ageing, providing the user with a consistent performance over an extended period of time.

Lastly, they possess very high insulation resistance and are highly durable, meaning they can be used in very harsh environments and high temperatures, withstanding temperature loads of up to 105°C.

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