MLF1005G1R8KT

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Fixed Inductors

Fixed inductors, as the name suggests, are non-variable inductors that are designed to always maintain a constant inductance value. They have no moving parts and are widely employed as components for frequency-dependent circuit applications such as radio frequency (RF) filters and impedance matching networks. Here we examine the application field and working principle of MLF1005G1R8KT fixed inductors.

MLF1005G1R8KT: Application Field

MLF1005G1R8KT is a surface mount fixed inductor from Toshiba. The model has footprint dimensions of 1.0 × 0.5 mm and is able to handle up to 1 ampere (A) of direct current (DC) without any additional heat sinking. The inductance range of the device is between 1.8 and 33 nanofarad (nF), with a self-resonant frequency of 1.2 to 20GHz. The inductance tolerance is ± 10%, making it suitable for applications with precise inductance requirements such as power line filters, impedance matching networks and high-frequency filters.

Due to its wider operating temperature range of -40°C to +105°C, the MLF1005G1R8KT inductor can handle higher power dissipation with minimal temperature rise. It also has good current transfer and voltage distribution characteristics, making it suitable for designing circuits with minimal power loss, as well as for frequency-dependent loop filters in precision amplification systems.

MLF1005G1R8KT: Working Principle

The working principle of an inductor is based on the principle of induction according to Faraday’s law of induction. Any alternating current passing through the inductor creates an electromagnetic field around the coil, which in turn induces a voltage in the same coil. This induced voltage opposes the change in current and, therefore, opposes any further change in magnetic field. This opposition to change in magnetic field is termed as inductance, which is mathematically represented by the equation:

L=μN²A/l

Where,

L = Inductance (in henry, H)

μ = Permeability constant (in H/m)

N = Number of turns of coil

A = Cross-sectional area of coil (in m²)

l = Mean length of coil (in m)

The MLF1005G1R8KT inductor utilises this equation for its applications. The inductor consists of a coil with a ferrite core. The ferrite core acts as an electromagnetic shield and increases the inductance value. The core material is selected according to the desired resonance frequency of the inductor. An alternating current passes through the coil of the inductor to produce the required inductance value.

The oscillations of the alternating current generate an electromagnetic field around the core, inducing a voltage in the same coil. This voltage opposes the rise and fall of the alternating current in the coil as a whole. The resulting inductance depends on the surrounding cross-sectional area, core material, and coil length. The MLF1005G1R8KT design ensures that the resulting inductance is within the specified range of 1.8-33 nF.

Conclusion

The MLF1005G1R8KT fixed inductor is a nanoscale component widely employed in frequency-dependent applications. Its widespread applications range from high-frequency filters to power line filters, impedance matching networks, and precision amplifier systems, due to the component’s improved efficiency compared to variable inductors. Its working principle is based on Faraday’s law of induction, which states that an alternating current passing through the inductor produces an electromagnetic field that induces a voltage in the same coil.

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