SFT37T70-5K391E-F

Film Capacitors

Film capacitors are a type of capacitor that uses a polymer film as the dielectric material between the two electrodes. They are used for a variety of applications due to their excellent electrical characteristics – such as high temperature stability, low ESR and ESL values, and low losses. One of the most common types is SFT37T70-5K391E-F, which is designed for applications that require a wide array of electrical characteristics.

Application field and working principle

SFT37T70-5K391E-F capacitors are primarily designed for general purpose, decorative, and motor electric applications. Due to their electrical characteristics, they can also be used in various other applications, such as power supplies, switching regulators, high-speed motors, and AC power supplies. They can also be used in medical and military applications, due to their reliable performance and low noise output.

The working principle of this type of capacitor is based on its dielectric layer. It consists of two layers of metal oxide film that are deposited onto the two aluminum foil electrodes. When the capacitor is placed in between the two poles of a power source, the positive charge on one foil polarizes the dielectric and an electrostatic field is created. This field acts as an insulator and prevents current flow between the two electrodes and thus allows it to store electrical energy. This stored energy can then be released when the capacitor is put between two different electrical potentials, thus producing a useful output.

The electrical characteristics of this type are determined by the thickness of the dielectric layer and the special characteristics of the aluminum foil electrodes. The thicker the dielectric layer, the higher the voltage that the capacitor can withstand before failing. On the other hand, thinner layers provide a better dielectric loss factor and better insulation resistance. Aluminum foils on the other hand, provide high levels of conductivity and low impedance for the capacitor. This helps to make SFT37T70-5K391E-F capacitors well-suited for a wide range of electrical applications.

The most important physical characteristic of SFT37T70-5K391E-F capacitors is its size. This type of capacitor is usually constructed from an aluminum housing that is much larger than other capacitors, making them more suited to industrial applications where vibration and shock resistance is required. It also has a larger temperature coefficient, but this is usually not a major factor when applied in industrial applications.

Overall, SFT37T70-5K391E-F capacitors are a reliable and versatile type of capacitor that can be used in a variety of applications. Its electrical characteristics, combined with its large size, make it one of the most popular choices for industrial applications.