4669-822M

DC Resistance (DCR):	115 mOhm Max
Height - Seated (Max):	0.310" (7.87mm)
Size / Dimension:	0.387" L x 0.165" W (9.83mm x 4.19mm)
Supplier Device Package:	--
Package / Case:	Radial
Mounting Type:	Through Hole
Inductance Frequency - Test:	7.9MHz
Operating Temperature:	-55°C ~ 125°C
Ratings:	--
Frequency - Self Resonant:	--
Q @ Freq:	35 @ 7.9MHz
Series:	4669
Shielding:	Unshielded
Current - Saturation:	2.2A
Current Rating:	1.05A
Tolerance:	±20%
Inductance:	8.2µH
Material - Core:	Ferrite
Type:	Wirewound
Part Status:	Obsolete
Packaging:	Bulk

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Fixed Inductors: 4669-822M application field and working principle

Fixed Inductors are widely used in various fields such as power electronics, communication, control, testing, instrumentation and energy management etc. Specifically, 4669-822M is an inductor specifically used for high-density surface mount designs. It features 6 SMD pads for mounting, two independent pins for power, one large power ground pad and two small temperature coefficient pads. It is often used in power supplies such as DC/DC converters, and power circuits of communication instruments and equipment.The working principle of 4669-822M is easy to understand and based on the basic law of electromagnetic induction. It creates an induced magnetic field when a varying current passes through its electrical windings. This will cause a varying voltage to develop across the two ends of the core, which is determined by Faraday\'s law of induction. This induced voltage is opposite to the original varying current, and adds to the input voltage to the core (minus the losses), thus an output at a higher voltage than the input voltage is available.Furthermore, 4669-822M can provide additional electrical characteristics which are vital for its applications. Firstly, during high frequency operations, it provides good stability by preventing parasitic oscillations which can be problematic in certain applications. This stability is achieved by minimising the inductance variation with temperature, and the self-resonance frequency of the core. The core also features very low losses, provided by the careful selection of components, which enables the inductor to work efficiently and dissipate minimal heat.Another key feature of 4669-822M is its EMI shielding characteristics, which are implemented by the combination of composite materials used to construct the inductor. It allows the radiation losses of the power circuits to be minimised, and the emissions from the core to be filtered out more effectively. This helps to minimise the probability of interference from sources outside the power circuit. The EMI shielding also ensures that the DC/DC converters in the power circuits are able to operate more efficiently without having to worry about interference from other electrical sources.In addition to its electrical and shielding characteristics, 4669-822M is also designed for robustness. As a surface mount component, its physical dimensions (length x width x height) are much smaller than conventional inductors, and its packages feature a special UV curing treatment which increases its environmental resistance and enhances its reliability. It also features an additional soldering pad to increase the surface area and ensure better current-carrying characteristics.Fixed Inductors like 4669-822M are increasingly becoming important components of modern electronic products. With their small size, high performance, and robust design, they are seen in a wide variety of applications. Their flexibility, reliability and efficiency have made them an indispensible tool in the fight against interference, temperature, and many other electrical constraints.

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