Active 47 µH drum-core for general-purpose filtering
The Murata LQH43MN470K03L is an active-production drum-core wirewound inductor in the LQH43 series, rated 47 µH ±10% at 1 MHz test frequency. The 220 mA current rating and 1.5 Ohm max DCR define the DC bias ceiling — push the current above 220 mA and the inductance starts to roll off as the ferrite core saturates, while the I²R loss at that current is about 73 mW, well within the 85°C ambient limit.
Unshielded 1812 footprint for board-level filtering
Unshielded construction means the magnetic field extends beyond the body — keep adjacent traces or sensitive components at least one body width away to avoid coupling. Self-resonant frequency is 10 MHz — above that the inductor behaves capacitively, so this part suits DC-DC converter output filters and power-line smoothing up to a few MHz. The Q factor of 35 at 1 MHz indicates moderate energy storage efficiency at that frequency; for higher-Q needs consider the air-core or ferrite-tuned alternatives in the same family.
Sourcing and compliance for BOM integration
Operating temperature range is -40°C to 85°C, covering most commercial and industrial environments. The ferrite core material is stable across this band; the inductance shift with temperature is typically under 5% from -25°C to 85°C for this material class.