PM75-221K

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Fixed inductors are electrical components that hold onto a certain amount of energy in their magnetic field upon currents being applied to them. PM75-221K is one of the widely used fixed inductors amongst similar devices within the electronic industry.

PM75-221K is a SMD common mode filter which is an unshielded type. It consists of two symmetrically twisted windings that are inductively coupled. The inductance value of this component is between 15uH and 1000uH, and can be utilized within circuit boards of power cables or other similar electronics.

This component is mainly used to reject electromagnetic interferences that are generated by motors or transformers. It is suitable to provide EMI filters for the elimination of common mode interferences in power lines and is also useful to reduce the conducted noise of the signal lines. PM75-221K are also often used for the suppression of differential mode interferences on the signal lines.

The working principle of PM75-221K lies in the combination of two symmetrically distributed windings which are wound together. When currents enter one of the windings, the magnetic flux is induced which inturn produces a voltage in the opposite winding, thereby becoming a mutual inductor. The current flowing through the inductor produces a magnetic field which in term generates a voltage across the inductor. This causes the electromagnetic interference to be reduced, suppressing the EMI.

The components of PM75-221K when mounted on a PCB are quite compact and low profile. Its small size enables it to function in small to medium sized systems. Apart from the PCB mounting, SMD filter parts can also be plugged directly onto the cables and grounded. This ensures consistent insertion loss and low insertion loss which is essential for EMI filtering requirements.

PM75-221K has very good thermal stability and high Q value, it is well protected against the environmental temperature and humidity. The insulation performance is very good and it can support a wide range of temperature from -50 to +125°C, ensuring a good circuit efficiency. Moreover, PM75-221K can also be offered with built in ferrite beads elements to make it an even better noise filter.

In conclusion, PM75-221K is a fixed inductor that is widely used in various systems. Due to its flexible SMD filter parts, this component is also quite versatile and can be used to reduce EMI and differential mode interference. With its superior thermal stability, insulation performance and high Q value, this component is essential for ensuring a noise free environment.

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