47 µH at 220 mA — where this inductor fits in the power rail
The Murata LQH43NN470K03L is a 47 µH drum core wirewound inductor in the LQH43 series, rated for 220 mA continuous current with a maximum DC resistance of 1.5 Ohm. This combination of inductance and current makes it a fit for filtering, DC-DC converter output chokes, and decoupling in low-to-moderate current rails where the 47 µH value provides sufficient impedance at switching frequencies up to the 10 MHz self-resonant point.
DCR and Q factor — what they mean for your circuit loss
With a DCR of 1.5 Ohm max, this inductor will drop 0.33 V and dissipate 73 mW at the full 220 mA rated current. That resistive loss matters in a 3.3 V rail — it consumes about 2% of the rail voltage before the load sees it. The Q factor of 35 at 1 MHz tells you the ratio of inductive reactance to effective resistance at that test frequency; a Q of 35 is typical for a ferrite-core wirewound in this inductance range and means the AC losses are well controlled below the self-resonant frequency.
1812 SMD footprint and unshielded construction
It is unshielded, so the magnetic field radiates from the drum core — keep sensitive traces or low-level analog circuits at least one package width away to avoid coupling.