BLM21AG151SN1D

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Ferrite beads and chips are used for multiple purposes, particularly for suppressing conducted electromagnetic interference (EMI) in various applications. The BLM21AG151SN1D is one of the most common ferrite product families used in today’s electronics markets. Its application fields and working principle are discussed in this article.

Application Field

The BLM21AG151SN1D ferrite has a high impedance to a wide frequency range, making it ideal for numerous applications. It is very effective at suppressing conducted EMI noise on single-ended lines between 10 MHz and 1 GHz and is especially useful on high-speed interfaces, such as USB, HDMI, and other digital signals. It can also be incorporated in power cables to reduce AC line noise from any source. It is more effective on common-mode noise compared to differential-mode noise, so it is particularly useful in the power and signal cables connecting the motherboard to peripheral devices. It is also widely used to suppress digital noise from switching power supplies and DC-DC converters.

Working Principle

The working principle of the BLM21AG151SN1D ferrite is simple. It is a high-frequency impedance device that absorbs and dissipates energy within an electrical circuit or cable. Its high inductance coefficient provides high impedance and low current loss for signals of higher frequency. It works by converting the electrical energy of the high frequency signals into heat, thus reducing the amount of energy transmitted through the circuit or cable.

The BLM21AG151SN1D ferrite also works to limit the rate of change of the electrical field, preventing the generation of electrostatic charges. This process is known as “grounding” and is important for ensuring safe and reliable operation of any system, especially high-power devices. In high-power systems, it is necessary to ground the cable shields or even the entire circuit board in order to ensure proper isolation from electrical shock.

In addition to its shielding capabilities, the BLM21AG151SN1D ferrite is also used to equalize the line impedance between the cable and the connected device, thus controlling signal reflectance. This ensures that signals are properly transmitted and timings remain accurate, which is especially important in digital systems to ensure proper communication of information.

Finally, the BLM21AG151SN1D ferrite is also used in high-frequency noise suppression applications, such as suppressing interference from radio-frequency transmitters. In these applications, the ferrite absorbs and dissipates energy from interfering radio-frequency signals, preventing them from propagating further.

Overall, the BLM21AG151SN1D ferrite bead and chip can be used in many different applications, both in power and signal line environments, to suppress conducted EMI, control signal reflectance, and suppress noise from radio-frequency sources. Its high impedance, low current loss, and low cost make it an ideal solution for many applications.

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