Active part — what the 150 µH rating means for your filter
The Murata LQH32MN151K23L is an active-production drum-core wirewound inductor in the LQH32 series, rated 150 µH ±10% at 1 MHz test frequency. The 70 mA current rating and 9.3 Ohm max DCR set the DC bias ceiling — in a power-supply output filter or an LC tank, the voltage drop across the winding at full rated current is roughly 0.65 V, which must stay within the downstream regulator's headroom. Unshielded construction means the external field couples into nearby traces or components — keep a ground plane under the footprint and allow at least one part-width clearance to adjacent magnetics or sensitive analog nodes.
Self-resonant frequency and Q — where the model breaks down
Self-resonant frequency is 7 MHz; above that the inductor behaves capacitively and the impedance drops. The Q factor is 40 at 796 kHz, which is the useful band for this part — a low-pass filter with a corner below 1 MHz sees the full inductance with minimal loss. The ferrite core material saturates gradually, not abruptly — the inductance rolls off as the DC bias current approaches the 70 mA rating, so derate by 20-30% if the inductor carries a steady DC component near the limit.
Package and temperature — board-fit constraints
The unshielded body means no magnetic shielding layer, so the part is lighter and cheaper than a shielded equivalent but radiates more. Operating temperature range is -40°C to +85°C, which covers most commercial and industrial indoor environments but not extended automotive or under-hood applications.