180 µH unshielded inductor for filtering and bias circuits
The Murata LQH43NN181K03L is a drum-core wirewound inductor in the LQH43 series, offering 180 µH inductance with ±10% tolerance in an unshielded 1812 (4532 Metric) surface-mount package. Rated for 120 mA DC current with a maximum DC resistance of 4.5 Ohm, this part is suited for low-to-moderate current filtering, decoupling, and energy storage in power supply rails and signal conditioning circuits.
Parametric fit: inductance, current, and self-resonant frequency
The 180 µH value is tested at 1 MHz and exhibits a self-resonant frequency of 5 MHz — above that frequency the inductor behaves capacitively, so it should be used well below 5 MHz for inductive filtering. Quality factor is 40 at 796 kHz, indicating moderate AC loss at that frequency; the unshielded construction means magnetic flux radiates, so board placement must avoid coupling into adjacent traces or sensitive analog loops.
Active production, standard package, and sourcing
Supplied in tape-and-reel or cut-tape formats, the 1812 footprint is widely supported by pick-and-place equipment and matches standard land patterns for this package size.