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Film Capacitors

Film capacitors, also known as plastic film capacitors or film dielectric capacitors, are a type of capacitor whose dielectric medium consists of electro-statically charged plastic films between two metal electrodes. This type of capacitor is especially well suited for electronic applications such as a timing circuit, an oscillator, DC blocking, energy storage, and so on. The BFC236859103 is one such film capacitor and below is a detailed description of its application field and working principle.

Application Field

The BFC236859103 capacitor is ideal for a wide range of applications in the electronics industry. One of the primary uses of this film capacitor is for timing purposes. It can be used in circuits such as an astable circuit, a monostable circuit, or a voltage-controlled oscillator. It is also suitable for applications such as AC blocking, coupling, and energy storage. In addition, this type of capacitor is also used in storage and commutation circuits, and as a steadying element in UHF power amplifiers.

Working Principle

A film capacitor consists of two pieces of metallic foil, each having a thin polymer film sheet in between them. The polymer is the main component of a film capacitor which provides the dielectric (insulator). The distance between two electrodes is fixed while the voltage across the electrodes is alternated continuously to induce an electromechanical force, thereby transfer of electric charges between the electrodes and piles up on one electrode while drawing away from another. This phenomenon is known as “dielectric absorption”. The charge stored in a film capacitor is proportional to the product of its capacity and voltage.

The film capacitor is a polarized device, and the polarizing voltage is directly proportional to the capacitance. That is why the capacitors of this type require at least a few volts of direct current (DC) to operate properly. The most common way of measuring the voltage of a film capacitor is through the electrostatic test method, which involves a small voltage applied at a specific frequency until the equivalent of the capacitor is obtained.

Conclusion

To summarize, the BFC236859103 is an example of a film capacitor that is suited for various electronic applications. Such applications include timing, oscillation, energy storage, and AC blocking/coupling. The film capacitor utilizes a polymer film dielectric between two metallic foils. Polarization voltage must be applied to the capacitor to behave properly. The voltage capacity of a film capacitor is determined using the electrostatic test method.

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