Drum core wirewound, 180 µH, 120 mA
The Murata LQH43NN181J03L is a drum core wirewound inductor from the LQH43 series, offering 180 µH inductance with ±5% tolerance in an unshielded 1812 (4532 Metric) surface-mount package. Rated for 120 mA continuous current with a maximum DC resistance of 4.5 Ohm, this part is suited for filtering and decoupling in low-current power rails or signal lines where the inductance value and the self-resonant frequency at 5 MHz define the noise attenuation band.
Parametric fit for the BOM line
The 180 µH inductance at 1 MHz test frequency and the 40 Q factor at 796 kHz give a clear impedance profile for the target frequency — the self-resonant frequency at 5 MHz marks the upper limit where the inductor behaves capacitively, so keep the operating frequency well below that. The ferrite core material supports the inductance stability over the temperature range, but the unshielded construction means the magnetic field radiates — adjacent traces or components in the layout need clearance to avoid coupling.