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Film Capacitors

A film capacitor is a type of electrical capacitors, also known as polyester capacitors or plastic film capacitors, which uses a plastic film as the dielectric. It contains a number of metal electrodes separated by a dielectric layer, and is commonly used for high volatage and high-frequency applications. Film capacitors, such as the SFT66T35K475B-F, are designed for use in power electronics, motors, AC drives, consumer electronics, and devices that require increased energy storage.

Working Principle

The SFT66T35K475B-F film capacitor is a polarized capacitor, with two metal electrodes separated by a dielectric or insulating layer. The electrodes are typically made of aluminum or tin-plated copper. The dielectric layer is typically made of plastic, polycarbonate, or polyphenylene sulfide (PPS). When an electric voltage is applied across the electrodes, an electric field is created that stores electrical energy between the metal electrodes.

The capacitance of the capacitor is determined by the area of the electrodes, the distance between them, and the dielectric constant of the dielectric material. The capacitance of the capacitor can be adjusted through changes in the electrode size or the dielectric layer thickness. Additionally, the dielectric constant of the film determines the amount of energy stored by the capacitor, which is known as its energy storage capacity; a higher dielectric constant means a greater energy storage capacity, and a lower dielectric constant means a smaller energy storage capacity.

Applications

The SFT66T35K475B-F is a film capacitor, designed for use in applications that require high-voltage and high-frequency requirements. It is typically used in power electronics, AC drives, motor control, consumer electronics, and audio equipment. It is also suitable for applications where a high-temperature rating or high humidity is required. Additionally, it can be used as a DC blocking capacitor, filtering noise, and energy storage.

The SFT66T35K475B-F is a robust film capacitor with a wide operating temperature range of -40°C to +85°C. It offers a rated voltage of 660 volts, a capacitance tolerance of -20 to +80 %, and a lifetime of 10000 hours at maximum voltage. It is safety approved to UL, CSA, and VDE standards and has full testing documentation available.

In conclusion, the SFT66T35K475B-F is a high-performance film capacitor designed for use in high-voltage and high-frequency applications. It offers a wide operating temperature range, a rated voltage of 660 volts, and a maximum energy storage capacity, making it ideal for power electronics, AC drives, motor control, consumer electronics, and audio equipment.

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