MKT1822410404W

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Film Capacitors

Film capacitors, also known as plastic film capacitors, are capacitors which use a plastic film as the dielectric. They are formed by the combination of a metal layer deposited on both sides of the film. Film capacitors are popular in many applications, such as coupling, bypass, snubber, DC blocking and high-frequency power filtering.

The MKT1822410404W is a typical film capacitor with excellent electrical parameters and dielectric strength. It is usually used in AC and DC coupling circuits, DC blocking circuits, and power filtering applications. The MKT1822410404W is constructed by depositing two metallic layers on both sides of a polyester film as the dielectric. Its capacitance ranges from 0.0022uF to 2.2uF, and its rated voltage ranges from 10 to 400Vdc.

Working Principle

The MKT1822410404W stores energy similarly to an inductor. The two metal layers on both sides of the plastic dielectric have charges of opposite polarity, and when a voltage is applied across them, they are automatically polarized. The amount of voltage stored is equal to the product of the applied voltage and the capacitance of the capacitor.

Since the voltage is reversely proportional to the capacitance, the MKT1822410404W can be used to couple AC or DC voltage across low- and high-impedance elements. It can also maintain a direct current by blocking AC voltage, be used to filter high frequency signals, or serve as a snubber by protecting the rest of the circuit from high voltage transients.

Application Fields

The MKT1822410404W is suitable for many application fields due to its wide capacitance and voltage range. It is mainly used as a coupling capacitor, since it allows AC signals in the low frequencies to pass through, while blocking DC signals. This is often used in radio receivers to block DC currents, allowing only AC signals in the audible frequency range to be amplified. Moreover, the MKT1822410404W can be used in DC blocking circuits to pass AC signals but block DC voltage. This can be used in industrial or automotive systems, such as DC motor controllers.

The MKT1822410404W can also be used as a power filtering capacitor for suppressing high frequency noise. This is especially useful in switching power supplies, as high frequency noises can disrupt other circuits and interfere with signals. It can also be used in snubber applications, to protect the circuit from voltage spikes. A typical use would be protecting a relay from voltage spikes, so it does not inadvertently activate and keep the system safe.

In conclusion, the MKT1822410404W is a versatile plastic film capacitor with a wide range of capacitance and voltage values, making it suitable for many applications. Its excellent electrical parameters and dielectric strength make it a great choice for coupling, DC blocking, high-frequency power filtering, and snubber applications.

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