33 µH, 115 mA — the DC bias and loss trade-off
The LQH32MN330J23L is a 33 µH unshielded wirewound inductor in the Murata LQH32 series, rated for 115 mA DC current with a maximum DC resistance of 3.5 Ohm. The 33 µH value at 115 mA means this part suits low-current filtering or energy storage where the DC bias stays well below the rated current — at 115 mA the inductance holds within tolerance; push beyond that and the ferrite core begins to saturate, dropping the effective inductance.
Unshielded construction — plan the PCB layout accordingly
This is an unshielded drum-core inductor, so the magnetic field radiates from the component. In a dense layout, keep sensitive traces or other magnetics at least a component width away to avoid coupled noise. The 1210 (3225 Metric) footprint is standard — the same pad pattern serves the wider LQH32 family, so a single PCB land pattern covers multiple inductance values. The self-resonant frequency is 12 MHz, meaning above that frequency the inductor behaves capacitively. For filtering applications, keep the operating frequency below 12 MHz — typically use it up to about 4-6 MHz where the impedance is still predominantly inductive. The Q factor is 40 at 1 MHz, which is moderate for a ferrite-core part at this inductance.