S0402-8N2F3E

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Fixed inductors are a type of electrical components with two terminals and four connections. In general, they consist of an inductor core and a coil winding. Other components may be involved, depending on the application of the device. The S0402-8N2F3E is an example of such a component, and this article seeks to explain its application field and working principle.

The S0402-8N2F3E is an SMD (surface-mount device) type of fixed inductor. It is constructed with an electro-magnetically controlled winding around a core made out of ferrite. Depending on the current passing through the winding, a certain level of magnetic flux is induced and stored in the core. When the current is turned off, the magnetic field value remains as long as the device is connected to a power source.

The S0402-8N2F3E is designed to handle currents of up to 0.2A (200mA). Its operating voltage range is 3.3V to 5.5V, with a maximum voltage of 10V. The inductance is 8uH ±20%, with a nominal current equivalent to 0.13A (130mA). The direct current resistance (DCR) is 9 mOhms (max), and the self-resonance is greater than 300MHz.

The primary application field for the S0402-8N2F3E is in circuit filtering, especially EMI (electromagnetic interference) suppression. It is used to filter high-frequency noise and Radiated EMI (REMI) signals, generated by microprocessors, CPU cores, or FPGAs. Other application fields include radio frequency (RF) circuits, switching power supplies, and switching mode power supplies (SMPS).

The S0402-8N2F3E\'s working principle is based on Faraday\'s law of induction. According to this law, when an electrical current passes through a conductor, it will create a magnetic field around it. As the current passes through the coil of the S0402-8N2F3E, a magnetic field is induced in the core of the inductor, causing the application of an inductive reactance to the current passing through it. This reactance is proportional to the frequency of the current and the inductance of the component. The higher the frequency and the inductance, the greater the reactance.

The S0402-8N2F3E is a very effective filtering component because it is capable of blocking high frequency current, while allowing the lower frequency ones to pass. The component works by absorbing the high frequency current and storing the energy in the inductive core. When the current with low frequency is passed through the device, the magnetic field created by the component releases the stored energy, which then dissipates into the environment.

In conclusion, the S0402-8N2F3E is a surface mount fixed inductor with a very low DCR (direct current resistance) and a very high self-resonance frequency. Its primary application is in EMI (electromagnetic interference) suppression. Its working principle is based on Faraday\'s law of induction. Furthermore, in circuits with high frequencies, the device is used to absorb the energy and dissipate it into the environment.

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