BLM21AG121SH1D

Series:	EMIFIL®, BLM21
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Filter Type:	--
Number of Lines:	1
Impedance @ Frequency:	120 Ohms @ 100MHz
Current Rating (Max):	800mA
DC Resistance (DCR) (Max):	100 mOhm
Ratings:	AEC-Q200
Operating Temperature:	-55°C ~ 125°C
Package / Case:	0805 (2012 Metric)
Mounting Type:	Surface Mount
Height (Max):	0.041" (1.05mm)
Size / Dimension:	0.079" L x 0.049" W (2.00mm x 1.25mm)

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Ferrite Beads and Chips - BLM21AG121SH1D Application Field and Working Principle

Ferrite beads and chips, as the name implies, are small components made of ceramic powder-like materials made of ferromagnetic materials that contain small amounts of metallic oxides. Ferrite beads and chips are used to control the flow of high frequency signals on data bus lines. Their main application fields include EMI/RFI noise filtering, signal transmission, and lightning protection.BLM21AG121SH1D ferrite chip bead is a common capacitor-type component used in the device. Usually the current passes through the centre or on each end of the component. The major use of BLM21AG121SH1D ferrite chip bead is to reduce the amount of high frequency noise in the electronic system and protect signal integrity.The BLM21AG121SH1D ferrite chip bead consists of two main parts: the magnet core and the dielectric sleeve. The core is made of ferromagnetic material which allows magnetic flux to pass through. The dielectric sleeve has a uniform thickness and is to provide a path of low resistance to the flow of current.The principle of the BLM21AG121SH1D ferrite chip bead is based on the electromagnetic induction. The alternating current of the signal passes through the centre or both ends of the ferrite chip bead. The magnetic flux passes through the core, generating an alternating current in the dielectric sleeve. As a result of the combination of the two opposing currents, the effective impedance of the BLM21AG121SH1D ferrite chip bead is raised, reducing the amount of noise in the signal. In this case, the higher the inductance of the component, the lower the impedance and hence the lower the amount of noise present in the signal.The most common applications of the BLM21AG121SH1D ferrite chip bead include digital communication circuits, power distribution circuits, audio equipment, radio and television circuits, and automotive systems. The ferrite chip bead may also used for the protection of system components against interference or surge. In power distribution circuits, they are used to filter out high frequency components and minimize noise in the circuit. Additionally, they can be used in audio equipment to reduce the occurrence of hum.Furthermore, the BLM21AG121SH1D ferrite chip bead can be utilized to eliminate high frequency noise from digital circuits, resulting in better signal integrity and speed. It can also be used to protect against lightning by providing a path of low resistance for the current to pass through. It is even possible to use theBLM21AG121SH1D ferrite chip bead to control the frequency response of a radio receiver.In conclusion, the BLM21AG121SH1D ferrite chip bead is a widely used component in a wide range of applications. Its unique properties are useful in reducing noise, protecting signal integrity, and protecting components against interference or surge.

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