ER1840-20KP

DC Resistance (DCR):	155 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:	7.9MHz
Operating Temperature:	-55°C ~ 105°C
Ratings:	--
Frequency - Self Resonant:	65MHz
Q @ Freq:	30 @ 7.9MHz
Series:	ER1840
Shielding:	Unshielded
Current - Saturation:	--
Current Rating:	870mA
Tolerance:	±10%
Inductance:	3.9µH
Material - Core:	Iron
Type:	Molded
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Fixed Inductors: ER1840-20KP application field and working principle Fixed inductors usually refers to inductors, sometimes transformers, that have a fixed magnetic core. They are designed to work with voltages and currents within certain limits and often consist of two terminals, one connected to an internal coil. ER1840-20KP is a fixed inductor specified as the ER series with a 89Ω DCR resistance and 20μH inductance value.Application FieldThe ER1840-20KP fixed inductors has a wide range of applications since it offers excellent performance in many applications. It is typically used in RF applications and for generating high switching frequencies, including use in high RPM brushless motors, LCD display backlight inverter circuit, noise and interference cancellation, DC/DC switching power supplies, and other applications requiring high frequency efficiency.Working PrincipleThe working principle of the ER1840-20KP fixed inductors is based on the use of inductance. When current travels through a wire or coil and a magnetic field is created, this inductance opposes the change in the current causing a build-up in voltage across the coil. This voltage is known as inductance voltage and is proportional to the rate of change of current. The inductance of ER1840-20KP fixed inductors acts as a filter between the input and the output stage.Upon opening or closing the circuit with the ER1840-20KP fixed inductor, the voltage across the inductor is high because it is opposing the change in current so when the circuit is opened or closed, a brief pulse of current travels through the inductor before the current drops to its steady-state value. This pulse of current creates an inductive kick that can cause sudden spikes in the output current or voltage that can damage the components in the power stage.The ER1840-20KP fixed inductor also reduces the amount of stored energy that is available to be released in the output stage. It acts like a dam that reduces the power from the power stage and alleviates the damaging effects of inductive kick.In addition to acting as a filter and energy damper, the ER1840-20KP fixed inductor can also be used as part of a transformer to increase or decrease voltage levels across different stages of the circuit. By using multiple inductors in tandem, multiple voltage levels can be generated that can be used for powering multiple stages of the circuit.The small size and excellent performance of the ER1840-20KP fixed inductors make them an ideal choice for many power electronic applications. They provide stability, efficiency, and a high frequency response that allows them to be used in applications that require high performance and low power consumption.

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