47 µH shielded inductor for DC-DC input/output filtering
The Murata LQH3NPN470MGRL is a 47 µH shielded wirewound inductor in the LQH3 series, built for surface-mount power rail filtering where a compact 3.00 mm × 3.00 mm footprint is required. Rated for 270 mA continuous current with a saturation floor of 260 mA, the part suits low-to-moderate current DC-DC converter output stages or input pi-filters where the peak inductor current stays below the saturation knee. The 1.68 Ω maximum DCR sets the I²R conduction loss — at 270 mA the copper loss is roughly 122 mW, which the 105 °C temperature ceiling can dissipate without derating in still air.
Shielded construction and self-resonant frequency
The ferrite core and shielded winding contain the magnetic flux, reducing radiated EMI that would otherwise couple into adjacent signal traces or the ground plane — a practical advantage when the inductor sits near a sensitive ADC or RF front-end. Self-resonant frequency is 5 MHz, meaning the inductor behaves inductively up to roughly that point; above 5 MHz the parasitic capacitance dominates and the impedance rolls off, so this part is best suited for switching frequencies well below 5 MHz. Inductance is tested at 1 MHz, which is within the inductive region and gives a reliable nominal value for the design calculation.