12 µH, 180 mA, 2 Ohm DCR — the three numbers that define the fit
The LQH32NZ120J23L is a Murata drum-core wirewound inductor in the LQH32 series, built on a ferrite core and rated for 12 µH at 1 MHz test frequency. The 180 mA current rating is the DC bias ceiling — push past it and the inductance collapses as the core saturates, so budget a derating margin if your load current peaks near that value. The 2 Ohm max DCR translates to 65 mW of I²R loss at rated current, which is manageable in a 1210 package but will raise the component temperature above ambient.
Unshielded construction and the 18 MHz self-resonant frequency
Unshielded means the magnetic field radiates from the core — keep this inductor at least two package widths away from sensitive analog traces or low-impedance signal lines to avoid coupling. The self-resonant frequency of 18 MHz is where the inductor's parasitic capacitance cancels the inductance; above this frequency the part behaves capacitively, so it is unsuitable for filtering or DC-DC switching above roughly 5 MHz. The Q factor of 35 at 1 MHz is typical for a ferrite-core wirewound in this inductance range — adequate for resonant circuits at that frequency but not a high-Q part for narrowband RF.
1210 footprint and ±5% tolerance
The ±5% tolerance is tighter than the ±10% or ±20% common on power-grade inductors — useful when the inductance value must stay within a narrow window for filter cutoff accuracy or resonant frequency control.