47 µH shielded inductor for DC-DC and signal filtering
The Murata LQH2MPN470MGRL is a 47 µH shielded wirewound inductor in the LQH2 series, rated for 180 mA continuous current with a DCR of 6.36 Ω max. The 47 µH value sits in the middle of the LQH2 inductance range, making it a fit for output filter chokes in low-power DC-DC converters and for decoupling noise on supply rails where a few hundred milliamps is the load ceiling. The 0806 (2016 Metric) package — 2.00 mm × 1.60 mm footprint with a 0.95 mm seated height — fits tight layout budgets on portable or space-constrained PCBs. The ferrite core and shielded construction keep magnetic flux contained, reducing radiated EMI that could couple into adjacent signal traces or sensitive analog sections.
Current ceiling, DCR, and saturation margin
The 180 mA current rating is the continuous DC limit at which the temperature rise stays within the part's self-heating budget, given the 6.36 Ω DCR. At full rated current, the I²R loss is roughly 0.2 W — modest for the 0806 body, but a layout with restricted copper pour around the pads will see higher local temperature rise. The saturation current is specified at 270 mA — 50 % above the rated current. This margin means the inductance holds within tolerance up to the saturation knee, so a transient load spike to 250 mA will not cause a hard roll-off. Below 270 mA the core remains in its linear region; above it the inductance drops sharply and the part behaves more like a low-value resistor. Self-resonant frequency is 10 MHz. Above this frequency the parasitic inter-winding capacitance dominates and the component becomes capacitive. For a buck converter switching at 1–2 MHz, the SRF is comfortably above the fundamental and its harmonics, so the inductor behaves inductively across the switching band.
The ferrite core material maintains its permeability across this band; the DCR will increase with temperature per the copper wire's positive temperature coefficient, so derate the current at the upper end. The ±20 % tolerance on the 47 µH nominal value is standard for power-grade inductors. For a buck converter output filter, the closed-loop compensator must accommodate the inductance spread; a design that assumes worst-case 37.6 µH (47 µH -20 %) at full load current will stay stable across the tolerance band.
The LQH2 series is a mature, high-volume line, so allocation risk is low outside industry-wide passive shortages. Supplied on tape and reel (Cut Tape also available), compatible with standard pick-and-place equipment.