LK21251R8M-T

Series:	LK
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Multilayer
Material - Core:	--
Inductance:	1.8µH
Tolerance:	±20%
Current Rating:	80mA
Current - Saturation:	--
Shielding:	Unshielded
DC Resistance (DCR):	450 mOhm Max
Q @ Freq:	45 @ 10MHz
Frequency - Self Resonant:	55MHz
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Inductance Frequency - Test:	10MHz
Mounting Type:	Surface Mount
Package / Case:	0805 (2012 Metric)
Supplier Device Package:	0805 (2012 Metric)
Size / Dimension:	0.079" L x 0.049" W (2.00mm x 1.25mm)
Height - Seated (Max):	0.041" (1.05mm)

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Fixed Inductors – LK21251R8M-T Application Field and Working Principle

Fixed inductors, in general, are electrical components that provide a constant self-inductance to its circuits. Fixed inductors can also be referred to as inductors, chokes, coils, and reactors. They are versatile and reliable components used in various different application fields such as telecommunications, automotive, consumer electronics, and military. The LK21251R8M-T inductor is an example of a fixed inductor. Its main features include high inductance stability, low electromagnetic interference (EMI) susceptibility, low direct current resistance (DCR), and a low power. This inductor is composed of a copper coil wound around a ferrite core. It has a surface mount package compatible with high speed, pick-and-place assembly. The LK21251R8M-T features an inductance range from 0.80 to 33 µH with a current range from 0.0025A to 330mA. It also has a DCR ranging from 0.00125Ω to 11Ω, and a self-resonant frequency of over 1MHz. This inductor is designed to operate in the frequency range of 0.2MHz to 2MHz, and in temperature of between -40°C to +85°C. This fixed inductor is used in many application fields, such as RF-circuits, GSM, UMTS, and XDSL telecom applications. Other applications include switching power supplies, DC-DC converters, buck or boost regulations, noise filters, and broadband amplifiers. This inductor is also useful in switching frequency converters, solar inverters, and energy saving lamps. The general working principles of the LK21251R8M-T are similar to those of other fixed inductors. It relies on Faraday’s Law of Induction and produces a magnetic field when an electric current runs through it. The voltage on the windings is proportional to the rate in which the magnetic field changes. The voltage produced across its windings is equal to the sum of the back-EMF\'s in each of its windings. This inductor stores an amount of energy in its magnetic field that is equal to the product of inductance and current squared. As a result, this stored energy can be released as heat when the current in the inductor quickly decreases. This energy causes the inductor’s temperature to rise and can cause the inductor to fail in extreme cases. In order to prevent this, x-ray shielding devices are usually used in RF applications. In conclusion, the LK21251R8M-T fixed inductor is a high quality component designed for various applications such as switching power supplies, DC-DC converters, noise filters, and broadband amplifiers. It relies on Faraday’s Law of Induction and its magnetic field produces an electric voltage when a current runs through it. It stores energy in its magnetic field that is released as heat during current decreases, necessitating the use of shielding devices to protect it from damage.

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