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Film Capacitors

Film capacitors are a type of capacitor that utilizes a polymer film, such as polystyrene, polyester, or polyethylene, as the dielectric medium. They are commonly used in high-end electronic equipment such as computers, amplifiers, audio mixers, and medical devices. Film capacitors come in many varieties, including radial leaded, axial leaded, surface-mount, and snap-in styles. In this article, we’ll take a closer look at a specific type of film capacitor, the 935C1W5K, along with its application fields and working principle.

Types of Film Capacitors

Film capacitors are divided into a few major categories depending on their construction, including foil film capacitors, metalized film capacitors, and plastic film capacitors. The type of dielectric material used is also important. Each type has its own advantages and disadvantages.

Foil Film Capacitors

Foil film capacitors are composed of polyester film wrapped around a sheet of aluminum foil. This type of capacitor typically has higher voltage ratings than plastic film capacitors and can offer better temperature stability. They also have better insulation and low dielectric absorption.

Metalized Film Capacitors

Metalized film capacitors are made from a polyester or polypropylene film with a metalized layer on the outside. They are similar to foil film capacitors in that they offer high voltage ratings and good temperature stability, although their insulation properties are not as good. They are also typically more expensive.

Plastic Film Capacitors

Plastic film capacitors are composed of a plasticized birch or polypropylene film. This type of capacitor offers high capacitance and low cost, but is limited in terms of temperature stability and voltage ratings. They are commonly used in applications such as consumer electronics, motors, and signal processing.

935C1W5K Application Fields and Working Principle

The935C1W5K film capacitor is a high voltage, high current, surface-mount device designed for use in a wide array of critical circuit applications, including aircraft and medical electronic systems. It features extremely reliable performance over a wide temperature range and is capable of withstanding up to 10,000 volts of continuous working voltage. Additionally, the 935C1W5K can handle transients and surges of up to 50,000 volts.

The working principle of the 935C1W5K is fairly straightforward. It utilizes the electrostatic principle of two conductors separated by an insulating material, in this case, a polymer film. When a voltage is applied between the two conductors, an electric field is created. This field pushes the electric charges from one conductor to the other, thus creating a capacitance. The value of the capacitance is determined by the size and material of the film and the distance between the two conductors.

Conclusion

The 935C1W5K is a highly versatile and reliable film capacitor ideal for applications in challenging environments. Its superior performance combined with its wide range of voltage and current ratings make it an excellent choice for projects for both commercial and consumer electronics.

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