SD3118-2R2-R Inductors, Coils, Chokes

Fixed Inductors

Fixed inductors are electrical components, usually constructed from a coil of wire, that incorporate a magnetic core. The SD3118-2R2-R is a popular fixed inductor primarily used for power source filtering and noise decrease applications.It provides a significantly smaller size as compared to other types of inductors, while still boasting an excellent combination of current ratings up to 3.2A, inductance values from 2.2uH to 22uH, and it is able to dissipate up to 1.2W at full rated current.

Applications

SD3118-2R2-R fixed inductors are commonly used for power supply filtering, electromagnetic interference (EMI) and radio frequency interference (RFI) reduction, as well as for suppressing transients and noise. These inductors can also be used to construct a tuned circuit, in order to differentiate between AC and DC signals.

Working Principle

Fixed inductors work by inducing a magnetic field in a coil of wire when a current passes through the wire, resulting in a voltage being induced in the coil. This voltage is proportional to the rate of change of the current, and is known as back EMF (electromotive force). This back EMF opposes the flowing current, which restricts its flow and provides an inductance.

When the inductor is connected in a circuit, the current through it is subject to the properties of the coil and the applied voltage. It also depends on the frequency of the applied voltage. At low frequencies, the current is approximately equal to the voltage applied, and at higher frequencies, the current results in the coil appearing as if it is an open circuit. This is known as the resonance frequency, and is unique to each inductor design.