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Film Capacitors

A film capacitor consists of a plastic film such as polycarbonate or polyester-imide as a dielectric layer, with electrodes on both sides, usually of aluminum. Film capacitors have excellent frequency characteristics, low ESR, and low noise, and are used in many high-frequency applications. One type of film capacitor, 930C1W3P3K-F, is designed for use as a suppressor in high-pulse withstand type of circuits where a low ESR is a must. This type of capacitor is typically used in the following applications:

• Gate Flyback capacitors
• Surge Protection Circuits
• Ignition Circuitry
• Coupling or Signal Filtering
• Timing Circuits
• DC/DC converters

The working principle of a porous film capacitor is based on the production of electrical charge on the surface of the plastic film when the electrodes interact with the dielectric materials of the film. The electrical charge then accumulates on the surfaces of the two electrodes and the charges on the surfaces repel each other, and the capacitor becomes charged. The polarity of the charge determines the polarity of the voltage. When an electrical field is created, a charge is stored in the capacitor\'s dielectric. Continuously applied electric field energy is dissipated as thermal energy to recharge the capacitor and dissipate static charge.

Because of its design, a 930C1W3P3K-F capacitor has excellent electric performance characteristics: low rise time due to low ESR, high stability, high frequency response, and high reliability. The electric parameters, such as leakage current, resistive loss, and maximum rated voltage, are higher than those of ceramic capacitors. The design also ensures it has low self-inductance, making it preferable when used in high-frequency or high-transient applications.

In conclusion, 930C1W3P3K-F capacitors are widely used for various applications. The design allows for excellent electric performance and high reliability. It is ideal for use in high-pulse withstanding circuits, gate flyback capacitors, surge protection circuitry, coupling and signal filtering, timing circuits, and DC/DC converters.

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