82 µH, 45 mA — what the ratings mean for the BOM line
The LQH31MN820K03L: Its 82 µH inductance at 1 MHz test frequency and 45 mA current rating define the operating window for a DC-DC filter or signal-line choke where the DC bias current stays well under 45 mA — exceeding that saturates the ferrite core and inductance collapses. Unshielded construction means the magnetic field radiates from the component — keep sensitive traces or other magnetics at least one package width away to avoid coupling. The self-resonant frequency is 7.5 MHz; above that the inductor behaves capacitively, so this part suits switching converters and filters operating below a few MHz.
Sourcing and lifecycle posture
Listed as Active in production — the LQH31 series is a Murata standard catalogue line with no announced end-of-life.