ELJ-FD3R3KF Inductors, Coils, Chokes

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Fixed Inductors are electrical components used to store energy in electromagnetic fields. They play an important role in radio-frequency (RF) circuits, from the antenna stage through to the final power amplifier. Many inductors are of the fixed type, meaning that their inductance is constant and can’t be changed. The ELJ-FD3R3KF is one such fixed inductor, and in this article we’ll take a look at its application field and working principle.

First off, let’s look at what makes the ELJ-FD3R3KF so attractive for RF designs. Its small size makes it ideal for use in small form factor PCBs, and its high rated inductance is also accommodating. The inductance is rated at 3.3nH, with a DC resistance of 47 milliohms. These specs make it perfect for applications such as antenna matching circuits, filter circuits, and power amplifier circuits.

Now, let’s break down how fixed inductors actually work. These components are essentially composed of two closely-knit wire coils, known as windings. Flowing current through these windings induces an opposing force, known as impedance. This is the property of an inductor that is responsible for storing energy within the electromagnetic field generated by the windings. The amount of impedance – and subsequently, stored energy – can be determined by the inductance, which is largely determined by the number of windings and the cross-sectional area of each wire.

This is where the ELJ-FD3R3KF’s high rated inductance comes into play. The high number of windings and extremely small wire cross-sectional area combine to create an inductor with an impressive amount of impedance. This impedance allows the inductor to store more energy within the electromagnetic field. The amount of impedance generated every time a certain amount of current passes through an inductor is known as the inductive reactance, and it is given by the equation X = 2πfL, where f is the frequency and L is the inductance. The ELJ-FD3R3KF’s rated inductance of 3.3nH would, according to this equation, generate a reactance of 207 ohms when operating at 100MHz.

The design of fixed inductors is mainly focused on making sure they don’t suffer from any losses. The highest amount of energy is stored in an inductor when the current is flowing through the windings in a single direction. However, due to the nature of AC current, they can actually end up carrying a “backflow” of current in the opposite direction. This affects the efficiency of the inductor, and can eventually lead to heat losses. This is why the ELJ-FD3R3KF features an effective shielding solution, ensuring that as little of the inductive energy as possible is lost.

A key characteristic of any inductor is its self-resonant frequency, which is the frequency at which the AC reactance of the component is equal to its internal resistance. If the component is subjected to a higher frequency than this, it can cause the inductor to enter what’s known as a parallel resonance. This resonant frequency can cause losses, effectively downgrading the performance of the component, and it’s important that this frequency is kept in check. The ELJ-FD3R3KF’s self-resonant frequency is rated at beyonf 4GHz, ensuring that it is suitable for use in most RF designs.

In conclusion, we’ve learnt that the ELJ-FD3R3KF is a fixed inductor designed specifically for RF applications. It has an impressive inductance of 3.3nH, and a high self-resonant frequency of greater than 4GHz. Its shield design ensures minimal heat and energy losses, making it a great choice for any designer in need of a reliable, high-performance inductor.

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