DC Resistance (DCR):	2.65 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 ~ 125°C
Ratings:	--
Frequency - Self Resonant:	53MHz
Q @ Freq:	40 @ 2.5MHz
Series:	2890R
Shielding:	Unshielded
Current - Saturation:	--
Current Rating:	405mA
Tolerance:	±3%
Inductance:	12µH
Material - Core:	Phenolic
Type:	Molded
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Fixed Inductors

Inductors are comprised of a coil or other conductive material which stores electrical energy by creating an electric field when current flows through it. This type of inductor is called a fixed inductor because its inductance does not change as the current flowing through it varies. A fixed inductor, such as the 2890R-22H, is used in a variety of applications including RF and signal processing filtering, timing, and impedance matching.

2890R-22H Application Field and Working Principle

The 2890R-22H is a wire mount RF choke inductor featuring a gapped ferrite core. It is suitable for use with applications such as broadband T1/E1 connection protection. This type of inductor is often used in circuit designs where high frequency noise is generated, such as with modulators and demodulators used in radio and television broadcasts. It is designed to have low Insertion Loss across the entire frequency range and high common mode noise rejection.The 2890R-22H is designed to work by providing an impedance to the high frequency noise generated by the modulator or demodulator, effectively limiting the amount of noise that is transmitted. By limiting the amount of high frequency noise, the overall signal quality is improved, resulting in a clearer and more reliable signal.

Operation

The 2890R-22H operates by storing electrical energy in a coil or other conductive material and creating an electric field when current flows through it. The inductor consists of a gapped ferrite core which is wound with a single piece of wire to form a fixed inductor. The inductor has a gap that allows the inductance to be changed by either a mechanical or electro-magnetic device.When the 2890R-22H is connected to a circuit, it absorbs the RF current and reduces the ripple of the current. This reduces the harmonic distortion and improves the signal integrity of the circuit. The inductor also has high common mode noise rejection which helps reduce EMI emissions from the circuit.

Conclusion

The 2890R-22H is an RF choke inductor suitable for use in a wide range of applications including T1/E1 connections, signal integrity and EMI emission reduction. It is designed to provide an impedance to the high frequency noise generated by modulators and demodulators and improve overall signal quality. The inductor is also designed to have low Insertion Loss across the entire frequency range and high common mode noise rejection.

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