MKT1817227406W

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Film capacitors are a variety of capacitors that use a thin plastic film as a dielectric. They can come in various shapes and sizes, but are typically cylindrical in shape, and use high value capacitance ratings and low inductance. The MKT1817227406W is a film capacitor utilizing a polypropylene dielectric material and features a voltage rating of 400VAC, a capacitance rating of 270nF, an operating temperature of +85°C, and an ESR of 0.18Ω.

The MKT1817227406W films capacitors can be used in a wide variety of applications. It is often used in DC detection circuits and audio circuits due to its combination of high capacitance and low ESR rating. It is also used in high frequency AC signal measurement circuits, as well as in DC filtering circuits for protecting circuits from voltage spikes.

The working principle of a film capacitor is relatively simple and straightforward. A thin plastic film is placed between two electrodes, usually made of metal. When a voltage is applied to the positive and negative electrodes, an electrical field is produced through the film, giving the film capacitor its capacitance.

The interior of the film capacitor is filled with a liquid or air. When a voltage is applied, a phenomenon known as electro-mechanical polarization occurs, which causes electrons to move at an angle to the straight line between the electrodes. This forms a sort of “wall” of positively charged particles at one electrode and negatively charged particles at the other electrode. This wall effectively stores electric charge, and this stored electric charge is what creates capacitance in the film capacitor.

By placing a plastic dielectric over the two electrodes, the area where the electric field is strongest is reduced, thus increasing the capacitance of the film capacitor. It also increases the dielectric strength, which is the voltage level where the capacitance starts to decrease. This is how the MKT1817227406W was able to achieve its high voltage rating.

As well as increasing the dielectric strength, the MKT1817227406W film capacitor’s construction also helps to reduce the ESR. Electrostatic shielding occurs due to the distance between the electrodes and the plastic film, as well as the dielectric material used. This helps to reduce the inductance of the capacitor, which in turn reduces the ESR.

In summary, the MKT1817227406W is a film capacitor that uses a polypropylene dielectric material, has a voltage rating of 400VAC, a capacitance rating of 270nF, an operating temperature of +85°C, and an ESR of 0.18Ω. Due to the combination of its high capacitance and low ESR rating, it can be used in a variety of applications, such as DC detection circuits, audio circuits, high frequency AC signal measurement circuits, and DC filtering circuits. Its working principle relies on electro-mechanical polarization and the use of a dielectric material to increase capacitance and reduce ESR.

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