22 µH wirewound in a 1812 footprint
The LQH43NN220K03L is a 22 µH drum core wirewound inductor from Murata's LQH43 series, built on a ferrite core and rated for 320 mA continuous current.
Unshielded construction and frequency limits
Unshielded construction means the magnetic field extends beyond the core — adjacent traces carrying sensitive analog signals or high-speed edges should be kept at least one part-width away to avoid coupling. The self-resonant frequency of 15 MHz marks the upper bound for inductive impedance; above that the part behaves capacitively, so it is best suited for DC-DC converter switching frequencies below 5 MHz or as a filter element in the low-MHz range. Q factor is 35 at 1 MHz, measured at the same test frequency as the inductance — this is a moderate Q for a wirewound in this package, adequate for general-purpose filtering and energy storage where low loss is not the primary constraint.
1812 surface-mount footprint
Supplied on tape and reel with cut-tape option, the part is compatible with automated assembly lines and can be ordered in the quantity that matches the build.