BLA31BD221SN4D Filters

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Ferrite beads and chips are essential components when designing an electronic system. They are used to filter out high-frequency interference, shield radiation, and place impedance onto signal lines. The BLA31BD221SN4D is a type of ferrite chip that offers interesting benefits for a wide range of applications.

Application Field

The BLA31BD221SN4D ferrite chip is particularly useful for audio systems. By connecting the chip in parallel with a balanced audio line, it can apply inductive impedance to reduce noise and improve signal clarity. It is also effective for EMC compliance, attenuating noise in the 10MHz to 2GHz range as part of an EMC system. Other applications of the chip include protecting oscillators or radio receivers from interference, and providing an inductivity bridle for powerline harmonic distortion.

Working Principle

The BLA31BD221SN4D utilises the ferromagnetic properties of the ferrite material for EMI suppression. The chip has a high inductance, allowing it to effectively suppress high-band, high-frequency signals. It operates at an impedance up to 22 Ohms and can dissipate up to 1 watt of power in extreme situations. This inductance depends on the characteristics of the ferrite material, which affects the suppression capability of a ferrite. The chip is relatively small and has a very low DC resistance.

Unlike its counterparts, the BLA31BD221SN4D does not require an additional ground connection (as long as the PCB is grounded), making it easier to implement in a PCB layout. This also means that the chip does not incur any additional losses due to the ground connection. The chip is also compatible with a wide range of operating temperatures ranging from -55°C to 125°C, making it suitable for a wide range of systems.

Conclusion

The BLA31BD221SN4D is an effective ferrite chip for a wide range of applications. Its high inductance and low resistance make it suitable for EMC compliance and audio system designs, while its wide temperature range makes it suitable for many systems. Furthermore, its small size and lack of a ground connection makes it easy to implement in a PCB layout.

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