BLM21BD601SH1D Filters

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BLM21BD601SH1D Application Field and Working Principle

The BLM21BD601SH1D, from Murata, is a ferrite bead and chip. These components are mainly used for suppressing electromagnetic noise from a conducted circuit to ensure the proper operation of the circuit. It has a impedance of 0.6 ohm at 100 MHz and a rated current of 4 A max.

Application fields

The BLM21BD601SH1D is most commonly used in automotive applications, such as in the vehicles alternator, to reduce the generation of noise during start and stop. It is also used in power supplmies, DC-DC converters, digital circuits, inverters, and electrical control systems. Because of its low impedance, it is well-suited for signal line noise suppression in densely populated PCBs. The BLM21BD601SH1D can also be used to reduce EMI between two circuits, such as between an input and output.

Working Principle

The BLM21BD601SH1D works by providing a low-impedance path for the induced noise current, enabling it to bypass the circuit without disruption. The component acts as a filter, allowing the desired signal to pass while blocking the interference. There are two main components of a ferrite bead and chip: the core and the winding. The core is made up of soft-magnetic material, which is designed to have high magnetic permeability and low losses. The winding consists of a coil wound around the core, which acts as an inductor. Its impedance is high at low frequencies and low at high frequencies. When the induced noise flows through the coil, its impedance is increased, providing a low-impedance pathway for the noise current, thus suppressing the EMI.

Conclusion

The BLM21BD601SH1D is a ferrite bead and chip, commonly used for suppressing interfering signals in a conducted circuit. It is mainly used in automotive, power supply, and digital circuit applications. It works by providing a low-impedance path for the noise current to bypass the system, thus blocking the interference. By using this component, the number of conducted EMI emissions is reduced, allowing for compliant signal transmission without disruption.

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