10 µH wirewound for power rail filtering
The Murata LQH31CN100K03L is a 10 µH unshielded wirewound inductor in the LQH31 series, built on a ferrite core. It carries a 230 mA current rating with a 1.69 Ohm max DCR — the DCR figure sets the self-heating at full load, so the temperature rise under continuous 230 mA is a factor in the thermal budget near other hot components. The 20 MHz self-resonant frequency means this inductor behaves as an inductor up to roughly 20 MHz; above that, parasitic capacitance dominates and the impedance rolls off. For a buck converter switching at 500 kHz to 2 MHz, the SRF gives plenty of headroom.
Last Buy — plan the BOM line now
Murata has marked this part Last Buy. That means the manufacturer has stopped taking new orders for ongoing production — the remaining inventory in the channel is the final supply. If this inductor is on your BOM, the window to secure stock is closing; a last-time-buy against your forecasted quantity is the standard move. No official successor order code is recorded. Once the Last Buy inventory is exhausted, a re-qualification with a different Murata inductor or a second-source part will be required. The 1206 footprint and 10 µH / 230 mA target narrow the search to other LQH31-family parts or a compatible shielded alternative if crosstalk is a concern.
1206 footprint and unshielded trade-offs
The unshielded construction means the magnetic field radiates into the surrounding board area; keep sensitive traces or other magnetics at least one part-width away to avoid coupling. The ferrite core material gives a stable inductance over this temperature range, though DCR rises with temperature per the copper wire's positive temperature coefficient.