R75RI21004030J

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Film Capacitors

Film capacitors are general-purpose capacitors with wide applications that are constructed with a dielectric composite film and metallized electrodes. The metallized electrodes on each side of the dielectric film give it electrical field strength and voltage stability. The dielectric film, along with the metallized electrodes, provide electrons with a conducting path from one side to the other, creating a useful capacitor. These types of capacitors are popular in electronic devices such as radios and televisions and are used for power supply and signal conditioning, protecting circuits and signal transmission.

R75RI21004030J Application Field and Working Principle

The R75RI21004030J is a type of film capacitor that is suitable for use in general electronics, telecommunication, and automotive applications. It has a maximum operating temperature of 105 °C and is a non-inductive type capacitor with a high capacitance per volume ratio. The R75RI21004030J is a relatively small capacitor, measuring only 18.5 x 21.5 mm. It has a rated voltage of 250VAC and uses a dielectric film of polypropylene (PP). This capacitor is designed for long-term stability and has a low equivalent series resistance (ESR) for high-frequency applications.

The working principle of the R75RI21004030J is based on the same principle as other types of film capacitors. When a charge is applied, an electric field is created between the two metallized electrodes that have been placed on top of the dielectric film. This electric field holds the charge in the middle of the capacitor between the two electrodes until a current is passed through. The current then dispels the charge from one side of the capacitor to the other, allowing the electric field to collapse and the charge to be re-allocated to its original place.

Film capacitors such as the R75RI21004030J offer a number of benefits, including greater temperature stability, low ESR, and excellent damping characteristics. They are also relatively resistant to voltage spikes and are highly reliable in general electronics, telecommunication and automotive applications. They are commonly used in analog applications including audio-frequency range (AFR) and wideband power supply filters.

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