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Film Capacitors

Film capacitors are used frequently in applications where high frequency, stability, low loss and large capacitance values are required. Generally, film capacitors are small, low-cost, and physically robust compared to other capacitor types. The most common film capacitor used is the polyester class, also known as Mylar.

305QPC250KA3A1CLA

The 305QPC250KA3A1CLA is a film capacitor from Panasonic. It is a physically-small, low-inductance capacitor, utilizing two layers of aluminum foil and two layers of metallized polyester film. The metallized layers are the electrodes and are connected to the external leads by means of soldering. A series of spacers between the electrodes and the external leads provide the necessary rigidity.

Application Field

The 305QPC250KA3A1CLA film capacitor is mainly used for the power supply and output filtering of switching power supplies. It is suitable for various pulse circuits and ripple capacitors, and can offer excellent performance in different environments. Also, it can be used in telephone switchboard, TV sets and other electronic equipments.

Working Principle

The 305QPC250KA3A1CLA film capacitor works using dielectric insulating material between two metal foil electrodes. It is constructed by extruding a polymer film to produce a long continuous membrane of polyester film that is then metallized to create a capacitor. The electrodes and dielectric layers are then laminated together under high temperature and pressure, creating a single component. The capacitor is then rolled up and enclosed in a plastic or metal can.

The 305QPC250KA3A1CLA film capacitor has a good self-healing property, excellent insulation strength and heat resistance. It can be connected in an AC circuit and its capacitance value is constant with frequency. Also, it has low impedance across the frequency range and does not suffer from voltage coefficient changes.

Additionally, the capacitor exhibits excellent noise suppression characteristics, making it ideal for use in high-frequency applications. It is also capable of handling high frequency ripple current and varying voltage. Finally, the dielectric material used in its construction gives the 305QPC250KA3A1CLA film capacitor superior high-temperature stability, making it suitable for extreme temperature applications.

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