220 µH wirewound for automotive and industrial filtering
The Murata LQH43NZ221K03L is a 220 µH unshielded drum-core wirewound inductor in the 1812 (4532 metric) surface-mount package. It is part of the LQH43 series, qualified to AEC-Q200 for automotive-grade reliability. Rated for 110 mA continuous current with a maximum DC resistance of 5.4 Ohm, this part suits power supply filtering, DC-DC converter output chokes, and noise suppression circuits where the load current stays under the rating.
Parametric profile and board-fit
The unshielded construction means magnetic flux radiates from the core — keep sensitive traces or low-impedance loops clear of the component body to avoid coupling. Self-resonant frequency is 4.5 MHz, placing the usable inductance band well below that point. The Q factor is 40 at 796 MHz, indicating moderate AC losses at VHF — this is a power-grade choke, not a high-Q tank inductor. The ferrite core material maintains inductance stability across this range, though DCR rises with temperature per the copper winding's positive coefficient.
No official successor or pin-compatible cross-reference is listed. The LQH43 series includes other inductance values and tolerances in the same 1812 footprint, but a direct drop-in substitute for 220 µH at 110 mA is this exact order code.