4445R-21K

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Fixed Inductors

Fixed Inductors are components of an electrical circuit that allows the an alternating current to flow through a coil in a single direction. A 4445R-21K fixed inductor, specifically, is a passive component built with a copper core that is coated with syntactic lacquer and is usually kept in a shielded metal package.

Application Field

The 4445R-21K fixed inductor is used in various industries such as semiconductor, automotive, industrial, military, medical, and consumer electronics. It is widely used in the telecommunications and computer industries for filtering signals, transmitting signals and matching impedances. It can also be used in switching power supplies, oscillators and amplifiers.

Working Principle

The 4445R-21K inductor works by generating a magnetic field in a coiled wire when a current passes through it. The presence of a magnetic field alters the magnetic field of the inductor, causing a voltage to be generated across the inductor. The higher the current passing through the inductor, the higher the magnetic field and the greater the voltage. This inductance, or the rate of change of the voltage across the inductor, is determined by the number of turns of the coiled wire, or the number of loops of the coil. The more turns of wire, the greater is the inductance.

Impedance Matching

In certain inductors, the two terminals are placed at 90° angles to make sure that all the current flows in the same direction. These inductors are used in impedance matching and are designed for resonance with a specific capacity. This allows a voltage to be generated across the inductor when it is connected in series with an impedance that is different from the impedance of the winding. Impedance matching is commonly used to ensure that the electrical output is stable and the current passing through the inductor is at a minimum.

Inductor Failure

Inductor failure can occur due to thermal runaway or due to a loose connection to the ground. If the inductor is used for voltage regulation or in a switching power supply, it should be designed with adequate thermal dissipation or else the coil can get too hot and cause the device to fail. A loose connection to the ground can cause the inductor to oscillate as current is not properly regulated. It is therefore important to check the inductor for any loose connections or to check the connections to the ground regularly to prevent such failure.

Conclusion

The 4445R-21K fixed inductor is a passive electronic component that is used for the transmission and filtering of signals, matching impedances and voltage regulation. This inductor is used in many different industry applications such as automotive, industrial, medical, military and consumer electronics. It works by generating a magnetic field in a coiled wire which changes the magnetic field of the inductor, causing a voltage to be generated. It can fail due either thermal runaway or loose connections. It is important to regularly check for any loose connections to prevent inductor failure.

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