SFC66T18K391B-F

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Film capacitors are electronic components comprising two conducting electrodes that are separated by an insulating film. The conducting electrodes are an anode and a cathode, and the insulating film is the dielectric. A wide range of film capacitors are available in the market, including the SFC66T18K391B-F.

The SFC66T18K391B-F is a radial, polyethylene naphthalate (PEN) film capacitor. It is often used in a variety of applications for filtering, timing, polarity reversing, bypassing, coupling, blocking, and other electrical circuits. In particular, this type of capacitor is used in potential dividers, AC switchgear controllers, LED drivers, power supplies, and radio receivers.

The SFC66T18K391B-F has a wide range of values (50V to 8,000VDC) and several shapes, including snap-in, screw, and axial. This variety allows for maximum flexibility depending on the specific application. It is designed for temperatures ranging from -55°C to 105°C and with a maximum capacitance of 6700uF. It produces low dielectric loss and has a low dissipation factor (DF). The combined features make it resistant to high vibration environments. The material used in the construction of the film also gives rise to low inductance and low parasitic series resistance.

The working principle of the SFC66T18K391B-F is quintessential of how all film capacitors work. When voltage is applied to the terminals, an electric field is created between the electrodes, which polarizes the dielectric film (the insulator). This causes electrons to move continuously towards the electrodes and creates an electric current. The current then forms an electric charge that is stored in the electrostatic field between the electrodes. This charge can be maintained over time, and it is released when the current is interrupted.

In conclusion, the SFC66T18K391B-F is a film capacitor designed for a variety of applications that require a robust and reliable solution. The wide range of values and shapes, along with the low dielectric losses and dissipation factor makes it an excellent choice for electrical circuits that require filtering, timing, reversing, bypassing, coupling, and blocking. Understanding its working principle is essential for using it properly and getting the desired performance.

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