IR04BH120K

Fixed inductors are a type of passive electronic component used to induce the flow of electric current. Amongst the commonly used fixed inductors is the IR04BH120K. It is a surface-mounted (SMT) fixed inductor with a rated inductance of 1200nH (min) at dc 20mA. In this article, the application field and working principle of the IR04BH120K will be discussed.

The IR04BH120K fixed inductor is suitable for high frequency applications such as radio frequency (RF) circuits, switching regulator circuit, and power supply circuit. Its construction comprises of a ferrite core with two windings of copper wire, and it is enclosed in an airtight environment. As the core of this inductor is made of ferrite, it increases the inductance and results in a higher quality factor. Its high saturation flux density and high self-resonant frequency enable it to be applied to high frequency applications. Moreover, it features a maximum operating temperature of 125 °C and an insulation resistance of 500 MΩ (min).

The operating principle of the IR04BH120K utilizes the Faraday’s law of induction. According to Faraday’s law, the induced voltage in an inductor is mathematically proportional to the rate of change of current in it. This is because when a varying current passes through the copper winding of the inductor, a varying magnetic field is generated, thus inducing electric current through the winding. This induced current remains in phase with the primary current, thus resulting in the energy being stored in the magnetic field. This stored energy can be released by connecting an external circuit and thus creating a self resonant frequency with a characteristic that varies for different inductors.

In conclusion, the IR04BH120K fixed inductor is an example of a surface mount fixed inductor with numerous capabilities due to its configuration. It is suitable for high frequency applications, features low self-resonant frequency, high saturation flux density and maximum operating temperature of 125 °C, and it utilizes the Faraday’s law of induction. Therefore, the IR04BH120K is one of the most purchased fixed inductors in the market.