A 470 µH wirewound for filtering and storage
The Murata LQH43CN471K03L is a drum-core wirewound inductor in the LQH43 series, delivering 470 µH ±10% in an unshielded 1812 (4532 Metric) SMD package. Rated for 90 mA DC with a maximum DC resistance of 8.5 Ohm, this part suits low-current filtering and energy-storage roles where the 470 µH value provides high impedance at switching frequencies below its 3 MHz self-resonant point.
What the 90 mA and 8.5 Ohm DCR mean for your circuit
The 90 mA current rating is the DC bias limit at which the inductance typically drops by 10% — stay below this to keep the 470 µH value stable in a buck converter or EMI filter. An 8.5 Ohm DCR at 90 mA produces an I²R loss of about 69 mW — negligible for most boards, but the voltage drop across the winding (0.77 V) matters if the inductor sits in a low-voltage rail where every millivolt counts. The self-resonant frequency of 3 MHz means this inductor looks inductive up to roughly 3 MHz; above that, parasitic capacitance dominates and the impedance rolls off — use it for switching frequencies well below 3 MHz, say 300 kHz or lower, to stay in the inductive region.
Rework and board-fit for the 1812 package
Unshielded construction means the magnetic field fringes into the surrounding board area — keep sensitive traces or other magnetics at least one package width away to avoid coupling.