LI1206H121R-10 Filters

Series:	LI
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Filter Type:	Power, Signal Line
Number of Lines:	1
Impedance @ Frequency:	120 Ohms @ 100MHz
Current Rating (Max):	800mA
DC Resistance (DCR) (Max):	150 mOhm
Ratings:	--
Operating Temperature:	-40°C ~ 125°C
Package / Case:	1206 (3216 Metric)
Mounting Type:	Surface Mount
Height (Max):	0.051" (1.30mm)
Size / Dimension:	0.126" L x 0.063" W (3.20mm x 1.60mm)

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Ferrite Beads and Chips: LI1206H121R-10 Application Field and Working Principle

Ferrite beads and chips are commonplace components in electrical circuitry that are used to reduce noise. They are also called by various other names such as Ferrite Beads, EMI Filter Chips, EMI Suppression Chips, and SMT EMI Filter Chips. In this article we will explore the application field and working principle of the specific product, the LI1206H121R-10.The LI1206H121R-10 is a surface mount EMI filter chip created by TDK/EPCOS, using ferrite beads. It has the dimensions of 2.0 x 1.25 x 0.5 mm and is rated for -55°C to +150°C temperature range. It is found primarily in level shifters, I/O filters, circuit protection applications, high frequency switches, signal line conditioning, signal line protection, and USB VBUS filter applications.Ferrite beads, and chips made from them, work by inductively dampening voltage spikes through the process of impedance matching. This match allows for the condensation of electrical signals which reduces a variance in voltages, which otherwise could lead to damage of circuit components. The inductive dampening action also prevents interference from external sources, which can also hinder circuit performance.In technical terms, a ferrite bead is a passive component composed of a material mix of ferrite and other elements that turns it into an inductor. Such beads have a generally high impedance at frequencies, which enables them to reduce electrical interference from electromagnetic or radio frequency sources. As a result, these beads can help keep signals “clean” over an input or output line, as well as provide protection from static electricity and voltage spikes.When used as surface mount EMI filter chips, such as the LI1206H121R-10, they act as noise filters, which reduce the noise in the signal path. This is accomplished by reducing the high frequency component of the signal, such as radio-frequency interference and high frequency noise. The chip also helps reduce noise on differential signals and improves their common mode attenuation performance. The filter chip also allows for circuit dampening, which helps to reduce currents, thus preventing electromagnetic interference.In conclusion, the LI1206H121R-10 surface mount EMI filter chip is an effective and reliable component used to reduce interference from external sources, as well as decrease the noise in signal paths. It is ideal for use in applications such as level shifters, I/O filters, circuit protection, high frequency switches, signal line conditioning, signal line protection, and USB VBUS filters. Its ferrite composition provides inductive dampening to reduce voltage spikes and protect against static electricity.

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