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C878AG35400AA2J application field and working principle

Film capacitors, sometimes called film dielectric capacitors, polyester capacitors, or plastic film capacitors, are electrical capacitors with an insulating plastic film as the dielectric, sometimes combined with paper as a stabilizer or separator. This kind of capacitor includes metal foil electrodes, which are embedded into the plastic film. The two different types of film capacitors are polyester and polypropylene capacitors.

Application Field

Film capacitors are most commonly used in filter applications such as suppression of high-frequency interference in power supplies or in high-voltage travo applications. They can also be used for coupling, bypassing, and decoupling applications, as well as in pulse circuits, timing circuits, measuring devices and many audio applications. Polypropylene film capacitors with high-temperature stability and superior self-healing characteristics are used in demanding medical applications and in circuits that handle high surge currents.

Working Principle

The principle of film capacitors is based on the idea of a dielectric-insulated plate capacitor. There are two conductive plates, such as copper or aluminum strips, separated by a thin layer of insulating polyester film, polypropylene film, or glass fiber. A voltage applied across the capacitor causes an electric field to exist between the two plates, resulting in a capacitor with a specific capacitance.

Film capacitors have a low equivalent series resistance (ESR) and are not prone to audible noise or microphonics. These capacitors also exhibit significantly less internal heating compared to ceramic capacitors due to their higher dielectric constant and resulting low ESR. These characteristics mean that film capacitors are useful in situations where high precision and stability are needed.

Conclusion

In summary, C878AG35400AA2J is a type of film capacitor which is used in a wide range of applications, from audio applications to high-voltage power supply applications. It has excellent characteristics, such as low equivalent series resistance (ESR) and high temperature stability, making it suitable for various applications.

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