RL855-121K

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Fixed Inductors

Fixed inductors, also known as choke coils, are types of electronic components used to store and create a larger inductance in a circuit than what would normally be present. There are a wide variety of fixed inductor packages, which typically feature two points of connection for both the AC current input and DC current output. The broad area of their application includes switching power supplies, RF, and other filter applications. One such exemplar is the RL855-121K, which is used in high frequency filter applications.

Principle of Operation and Construction of RL855-121K

RL855-121K is an inductor manufactured by Taiyo Yuden, which is a multi-layer ceramic chip inductor of small size and with high inductance value. It consists of core material i.e. Ni-Zn ferrite, windings, and other components. The ferrite core provides an inductor with an air gap, which increases the inductance from 1.2µH to 8.2µH in this particular construction. The windings of the component are made up of a thin copper wire. Dimensional characteristics of RL855-121K are 6.0mm x 6.2mm x 4.2mm.

The RL855-121K is used primarily as a low-frequency filter which filters out high-frequency noise or spurious signals. This is done by passing an AC signal through the inductor, wherein the alternating current produces a magnetic field in the core, allowing it to be converted into a DC signal that can then be further filtered. This prevents high-frequency noise from affecting the circuit and causing it to malfunction.

The RL855-121K also has a wide application field. One example of its usage is for noise decoupling. It is also used for DC power line noise suppression, signal line noise decoupling, antenna tuning, and RF interference suppression. RL855-121K can also be used for low impedance filtering against high frequency EMI signals in a power system.

Features and Benefits of RL855-121K

The RL855-121K is a high quality, precision component designed for reliability. It possesses good anti-EMI characteristics and a wide range of inductance values which make it ideal for multiple different applications. One of its main advantages is its size; it is relatively small compared to other inductors, with a maximum size of 6.0mm x 6.2mm x 4.2mm.

Furthermore, it also offers an excellent temperature stability of -20 degrees Celsius to + 105 degrees Celsius, with an operating temperature range of -25 degrees Celsius to + 85 degrees Celsius. The RL855-121K provides a high return current ratio making it suitable for high-frequency applications such as RFI and EMI suppression. Moreover, it also provides a low DC resistance for a low power consumption through the component.

Conclusion

The RL855-121K is an exemplary component showing the versatility and efficiency of fixed inductors for various applications. It has proven to be a reliable component with good temperature stability and excellent anti-EMI characteristics, making it ideal for use in high-frequency applications. Additionally, its small size and high return current ratio provide advantages not found in other inductors. This makes it suitable for use in a variety of applications, including decoupling, RFI, and power line noise suppression.

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