Core parametrics for the BOM line
The Murata LQH31MN1R2J03L is a 1.2 µH drum-core wirewound inductor in the LQH31 series, housed in the standard 1206 (3216 Metric) SMT footprint. Its 165 mA current rating and 370 mOhm DCR define the DC loss and load ceiling for filtering and DC-DC output stages.
Frequency response and Q factor
The self-resonant frequency of 90 MHz sets the upper bound for inductive behaviour; above this frequency the component acts capacitively. A Q of 35 at 10 MHz is typical for a ferrite-core wirewound in this inductance range, adequate for general-purpose filtering but not for narrowband resonant circuits that require a higher Q.
The unshielded construction means magnetic flux couples into nearby traces and components — layout should keep sensitive signal paths at least a component width away.