SD18-821-R

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Fixed inductors are electricity-storing components used in circuits like power supplies and oscillator applications. SD18-821-R is a type of fixed inductor that offers high inductance values for moderate DC current levels. This inductor has various application fields as well as a working principle.

Specifications

The SD18-821-R offers an inductance rating of 1.9uH with a DC resistance of 13mΩ. It has a self-resonant frequency of 3.6MHz and a rated current of 1.2A. This component also has a surge current rating of 6.2A and a total to core ratio of 10.3.

Significance of Specifications

High inductance values are essential for low DC current levels. This is because inductors are designed to store electricity whereas resistors are designed to restrict current. The SD18-821-R, therefore, is very effective in such circuits. The high self-resonant frequency, total turn ratio, and surge current ratings make this inductor suitable for high-frequency applications.

Application Fields

The SD18-821-R can be used in power supply circuits, oscillator circuits, computer and cellular phone circuits, and other switching circuits. It can also be used for high-frequency filtering applications like radio frequency interference suppression and noise filtering.

Working Principle

An inductor is essentially a coil of wire which, when connected in a circuit, passes a varying current due to an applied voltage. The SD18-821-R inductor works on the same principle. When current passing through it undergoes a change, the changing magnetic field around it induces a voltage in it. This voltage then opposes the change in current, resulting in a delayed response. This is called inductive reactance.

Conclusion

The SD18-821-R is a type of fixed inductor which offers high inductance values for moderate DC current levels. It is suitable for high-frequency applications due to its high self-resonant frequency, total turn ratio, and surge current ratings. It can be used in various circuits like power supply circuits, oscillator circuits, computer and cellular phone circuits, and other switching circuits. This type of fixed inductor works on the principle of inductive reactance, where the changing current in it induces a voltage which opposes the change.

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