ER1840-04KM

DC Resistance (DCR):	65 mOhm Max
Height - Seated (Max):	--
Size / Dimension:	0.187" Dia x 0.437" L (4.75mm x 11.10mm)
Supplier Device Package:	--
Package / Case:	Axial
Mounting Type:	Through Hole
Inductance Frequency - Test:	25MHz
Operating Temperature:	-55°C ~ 125°C
Ratings:	--
Frequency - Self Resonant:	350MHz
Q @ Freq:	50 @ 25MHz
Series:	ER1840
Shielding:	Unshielded
Current - Saturation:	--
Current Rating:	2A
Tolerance:	±10%
Inductance:	330nH
Material - Core:	Phenolic
Type:	Molded
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Fixed Inductors

Inductors are passive components that store energy in the form of magnetic fields when energized by an electric current. They are commonly used in electrical circuits to limit electrical noise, provide stable voltage regulation, and filter out unwanted signals. Fixed inductors, in particular, are inductors with non-adjustable inductance values. The ER1840-04KM is one such example of a fixed inductor. Developed by Taiyo Yuden, this component is especially designed for low-impedance and high-frequency applications. It is often used in resonant circuits, switch-mode power supplies, and high-frequency transmission lines, among many other applications.

Design

The ER1840-04KM is a Ferrite Bead type of inductor, making it highly stable and well-suited for high frequency applications. It also comes in a surface-mount (SMD) package, making it suitable for installations with limited space. It is constructed from a wire wound core and has a rated inductance value of 4.7µH. Last but not least, this component also has an Ohmic resistance of 1.08Ω and an SRF value of 42MHz, which makes it suitable for high-frequency applications.

Application

The ER1840-04KM is especially designed for use in switch-mode power supplies, resonant circuits, and high-frequency transmission lines. It can also be used for impedance matching in RF and microwave components. Its low Ohmic resistance allows for faster switching, while its high SRF value enables it to filter out unwanted signals.

Working Principle

When an electric current passes through a wire, it creates a magnetic field around the wire. This magnetic field is strongest near the wire and weaker around the outside. The magnetic field created by an inductor is much the same, but instead of one wire it is composed of many. These multiple wires are coiled around a core, which serves to further concentrate the magnetic field. The ER1840-04KM is a fixed inductor, meaning that its inductance value is fixed and cannot be adjusted. When an electrical current passes through it, the inductor stores energy in the form of a magnetic field, which can then be used to filter out unwanted signals, limit electrical noise, and provide stable voltage regulation.

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