BLM18BD151SN1D

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Ferrite beads and chips are essential components for electrical and electronic circuit designs, providing frequency and signal filtering as well as offering similar functionality to that of inductors. The BLM18BD151SN1D is a specific type of such component and its use in circuit design and the underlying working principles are discussed below.

Application Field

Ferrite beads are mainly used for filtering the power supply lines and communication lines of electronic equipment, for example, the BLM18BD151SN1D can be used in high-end wireless communication systems such as WLAN and WiMax and for the requirement of ultra-low noise and high ESD protection. The bead can also be used in automotive, medical and industrial applications for similar electrical requirements. The design is also suitable for Automotive TV Tuner, Handsets (LTE/4G/HXX), High speed USB, Multimedia port, WiMAX and Wireless LAN applications.

Working Principle

The BLM18BD151SN1D is a small ferrite bead designed to prevent radio frequency interference (RFI) and electromagnetic interference (EMI) at the source. The bead interacts with the frequencies of EMI/RFI and acts as a filter, blocking them from entering into the circuit. The bead is basically a passive, one-way solution for EMI or RFI, part of a larger system of EMI shielding. It works by providing a high impedance so that frequencies from outside the range of the desired signal cannot pass through to the main circuit. The bead is made up of ferrite material, which is an oxide of iron and resembles ceramic material in composition, with the ferrite bead acting like a high-pass filter, blocking out low frequency noises while allowing high frequency noises to pass through.

The construction of BLM18BD151SN1D includes a blocking core wound with high grade enameled copper wire and encapsulated in a thermoplastic material. The core material and coil of each bead is constructed to maximize the impedance along its length, where the higher impedance the bender has, the larger the inductance that is present. The inductance of the BLM18BD151SN1D is typically 1.5nH, its current rating is 1.0A with a max frequency of 10GHz and a voltage rating of 16V. All these values determine how well the bead will attenuate EMI/RFI over a certain frequency range.

Conclusion

Ferrite beads and chips are essential components of electrical and electronic circuits, providing mechanisms for filtering signals, preventing the entry of radio frequency interference (RFI) and electromagnetic interference (EMI) and offering comparable features to those of inductors. The BLM18BD151SN1D is an example of such a component and has been designed for use in high-speed USB, multimedia port, WLAN, automotive application and more. Its construction consists of a blocking core wound with copper wire and an encapsulation in thermoplastic material. This construction provides a high impedance to prevent low frequencies from entering the circuit but allows high frequencies to pass through.

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