79F120K-TR-RC

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Fixed Inductors

An inductor is a two-terminal electric device that is used to store energy in the form of a magnetic field, or more correctly, as a change in magnetic flux through a magnetic core material. Inductors are passive components, which means that they don’t introduce any energy (such as a current source) into the circuit but are instead used to either store or absorb energy. Inductors come in different sizes and shapes and are made from a variety of materials such as ferrite, iron, and even air.

Two common types of inductors are fixed inductors and adjustable inductors. Fixed inductors are components that have a fixed inductance that does not change, even under different frequencies and applied voltages. They also have a higher inductance than adjustable inductors. They are mainly used to filter out radio frequency or other high frequency noise, while also having applications in power supplies and signal filtering.

An example of a fixed inductor is the 79F120K-TR-RC. It is a single layer, air core inductor with a fixed inductance of 120 uH (micro Henry) at 1 A (ampere). Its general purpose application field is noise filtering and its primary application is for IC power supplies.

Fixed inductors are used in electronic circuits to provide a constant and stable inductance value. They are generally made out of ferrite cores, although some other materials such as iron or air is also used depending on the application. Generally, fixed inductors are designed to hold an inductance value even when subjected to changing frequencies or changing voltages. This is typically achieved by wrapping multiple layers of insulated copper wire around the core material. The number of layers and the distance between each layer depends on the inductance value required.

The working principle of a fixed inductor is relatively simple. When current passes through the inductor, it produces a magnetic field. When this magnetic field changes, the magnetic field induces an electric field which produces a current in the opposite direction, thus reducing the current flowing through the inductor. This effect is known as the Faraday effect and it is used in fixed inductors to provide an effective and stable inductance value.

Fixed inductors are a commonly used passive electronic component and their ability to provide a constant inductance value makes them invaluable in electronic design. Fixed inductors are mainly used for filtering radio frequencies, signal filtering, and power supply applications. Despite their efficacy, their inductance value is fixed and cannot be adjusted, unlike adjustable inductors.

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