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Film Capacitors

Film capacitors are a type of capacitor made from foil material, generally plastic film, paper, or metal foil, and are part of a family of capacitors known as “Film Capacitors” or “Film Dielectric Capacitors”. They have a variety of uses, including power electronics, consumer electronics, and even high-frequency applications. Film capacitors are stabler with temperature, and have a longer life time compared to traditional ceramic and electrolytic capacitors.

The SFA66S3K288B application field

The SFA66S3K288B is a film capacitor manufactured by Shanghai Nangjing Baoye Group Film Capacitor Industry Co., Ltd., and is primarily used in high frequency, audio and radio frequency applications. It is typically used to provide signal and power line noise suppression, and can also act as a DC-blocking capacitor for music, television, and other audio equipment. The SFA66S3K288B capacitor has a capacitance of 68 nF, a voltage rating of 630 V, and dimensions of 18 x 35 mm.

The SFA66S3K288B working principle

Film capacitors are based on the principle of dielectric polarization. When exposed to an electrical field, dielectric polarized molecules in the film material are attracted towards the electrodes. This creates a Faraday effect, also known as displacement current, which is the current flowing between the electrodes. The distance between the electrodes and the thickness of the film material determine the capacitance of the capacitor.

The SFA66S3K288B film capacitor is a polypropylene film capacitor that is designed to provide excellent high frequency noise reduction capabilities. It consists of a low-loss ED Copper foil and a polypropylene film, which have a low-loss rate, low temperature coefficient, and a high insulation resistance. This ensures that it can handle large amount of current and voltage, while still providing good signal clarity and low distortion.

Conclusion

The SFA66S3K288B is a film capacitor manufactured by Shanghai Nangjing Baoye Group Film Capacitor Industry Co., Ltd. It primarily used for high frequency, audio, and radio frequency applications, and is used to provide signal and power line noise suppression, as well as DC-blocking for music and television equipment. It uses the principles of dielectric polarization, which involves molecules in the film material being attracted towards the electrodes, creating displacement current which determines the capacitance.

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