2890R-40G

DC Resistance (DCR):	2.1 Ohm Max
Height - Seated (Max):	--
Size / Dimension:	0.280" Dia x 0.900" L (7.11mm x 22.86mm)
Supplier Device Package:	--
Package / Case:	Axial
Mounting Type:	Through Hole
Inductance Frequency - Test:	2.5MHz
Operating Temperature:	-55°C ~ 105°C
Ratings:	--
Frequency - Self Resonant:	12MHz
Q @ Freq:	75 @ 2.5MHz
Series:	2890R
Shielding:	Unshielded
Current - Saturation:	--
Current Rating:	305mA
Tolerance:	±2%
Inductance:	82µH
Material - Core:	Iron
Type:	Molded
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Fixed Inductors - 2890R-40G Application Field and Working Principles

Fixed inductors are components that consist of wire wound around a core, usually of ferromagnetic material. The core’s magnetic field then produces an induction electromotive force in a conductor when a varying current is supplied to it. Fixed inductors serve a number of useful functions for both AC and DC circuits, such as energy storage, filtering, easing switching transients, and supporting transformer coils. The 2890R-40G is one such component in this family and is used in a range of applications.

2890R-40G Characteristics

The 2890R-40G Fixed Inductor from Murata Electronics is a high current, surface mount inductor with a design core that works up to 4GHz. The maximum current is 40 Amps. The inductance range of the 2890R-40G reaches from 2.2 to 33nH, and its resistive losses are low at only 0.0025- 0.0036 ohms. The device’s substrate is RO4350B-based, and its operating temperature range is –40°C to +85°C. The inductor is somewhat larger than other SMD inductors, with a size of 2.6 x 8.6 x 1.2 mm.

2890R-40G Application Field

The 2890R-40G is used in a number of applications, such as VSAT and Bluetooth communication systems, power conditioning for low noise analog circuits, mobile communication systems, PLLs, low noise switching power supplies, and additional DC/DC converters, among others. It also is used in power amplifier circuits because of its high current capability.

2890R-40G Working Principle

The 2890R-40G is a fixed inductor which works by using a core made from a ferromagnetic material. The core stores the magnetic field produced by the current flowing through the conductor inside the inductor. This magnetic field then induces current in the conductor to be directed in the same direction as the original current. This is known as Faraday’s Law of Induction, or, more modernly, Lenz’s Law. This opposing current creates a back-EMF that works against the original current flow, increasing the voltage drop in the circuit. The magnitude of the voltage drop is a function of the frequency and magnitude of the current in the conductor, as well as the amount of inductance present in the inductor.

Conclusion

The 2890R-40G is a high current surface mounted inductor with sizeable current capabilities, which makes it an ideal component for a variety of applications. Its ferromagnetic core can store magnetic induction force to create an opposing current to the flowing current, providing the effect of an inductor. The working principle of the 2890R-40G is based on Faraday’s Law of Induction and allows it to be a reliable component in power conditioning, Bluetooth systems, and low noise switching power supplies.

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