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Film Capacitors

A film capacitor, also known as a foil capacitor, is a capacitor that uses a thin plastic film as the dielectric, and metal foil as the electrodes. The plastic film is actually the main constituent in the capacitor, and is typically polyester or polycarbonate, but sometimes in heavier duty applications fluoropolymer films are used. These capacitors can have values ranging from pico to milli Farads; depending on the construction, capacitance per unit volume could be as low as 0.1nF/mm³ and as high as 5µF/mm³.

The 255PMB850KF is a standard film capacitor made with excellent performance. It is constructed with a unique capacitor element not found in other products. This capacitor combines a deep drawn foil electrolytic anode foil with an insulating paper. The paper helps to increase component stability, and increases resistance to dielectric breakdown.

Applications

The 255PMB850KF is suitable for a wide range of applications. It is a great choice for high frequency/high ripple current power supplies and voltage sources. It is also suitable for low frequency power supply filtering/rectifying and coupling capacitors. It is perfect for high voltage and high current traffic signalling, automotive and communication systems.

Working Principle

The working principle of the 255PMB850KF is relatively simple. It is constructed like that of any other standard film capacitor, consisting of two electrodes, and a dielectric layer in between them. When voltage is applied to the electrodes, electric fields are created and this causes electrons to flow through the dielectric material in between them. This is how the capacitor stores energy and generates a current when needed.

The electrode structure of the 255PMB850KF is different to most other film capacitors in that it combines a deep drawn electrolytic anode foil with an insulating paper as the other electrode. This unique construction helps to increase component stability, and increases resistance to dielectric breakdown.

The 255PMB850KF also has an increased ripple current tolerance. This is due to the unique combination of electrical and mechanical properties that aid in heat dissipation, which leads to more efficient operation.

The 255PMB850KF film capacitors are designed to provide superior performance compared to traditional film capacitors. They have a wide range of uses and can be found in a variety of applications such as automotive, communication systems, and high voltage & high current traffic signals.

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