What the 45 mA rating means for your circuit
The LQH31MN101J03L is a 100 µH drum-core wirewound inductor in a 1206 SMD package, rated for 45 mA continuous current. At that current the DC resistance of 12 Ω drops about 540 mV and dissipates roughly 24 mW — well within the part's self-heating budget for a typical signal-filter or low-power DC-DC output choke. Self-resonant frequency is 7 MHz, so the inductor behaves inductively up to that point. Above 7 MHz the parasitic capacitance dominates and the impedance rolls off — useful to know if you are filtering a switching regulator switching at a few megahertz. For a narrow-band matching or resonant tank circuit at 2.5 MHz, this Q gives a reasonable selectivity without excessive loss.
Last Buy — what it means for procurement
Murata has classified the LQH31MN101J03L as Last Buy. This means the manufacturer has announced end-of-life and the final production window is closing. No official successor part number is listed on the lifecycle record. For a BOM line that depends on this exact inductance, tolerance, and package, the Last Buy status means you should secure your lifetime-buy quantity now. Once Murata's last order date passes, the only channel will be independent surplus inventory. The part is unshielded — the ferrite drum core radiates a fringe field. In a dense layout, keep sensitive traces or other magnetics at least one part-width away to avoid coupling.
Package and rework considerations
1206 (3216 metric) is a large, two-terminal SMD — easy to hand-solder or hot-air rework. The ferrite core is not moisture-sensitive (no MSL rating needed for a wound component), so no bake-out is required before reflow. Just pre-tin one pad, place the part, and reflow with tweezers. The seated height is 2.00 mm max — low enough to clear most potting compounds or conformal coatings, but tall enough that the part is easily visible for visual inspection after reflow.