Murata has flagged the LQH31MN4R7K03L as Last Buy — the manufacturer's final production run is in progress or closed, and once existing stock is exhausted, no further units will be manufactured. For a BOM that depends on this 4.7 µH unshielded inductor, the procurement decision is time-sensitive: secure last-time-buy inventory now through independent distribution, or qualify a replacement before the supply dries up.
Parametric anchor: 4.7 µH, 120 mA, 2.21 Ω DCR
Rated at 120 mA DC, the 2.21 Ω max DCR sets the self-heating limit: at full current, I²R loss is about 32 mW, well within the 1206 body's dissipation capability for a 70°C ambient rise. The self-resonant frequency of 31 MHz is well above the test frequency — this inductor behaves as a pure inductance up to roughly 10 MHz, making it suitable for DC-DC converter output filters and bias-T circuits in that band.
Q factor and core material — signal integrity context
A Q of 35 at 8 MHz is modest — typical for a ferrite-core drum inductor in this footprint — and means the AC losses are about 3% of the reactive power at that frequency, which matters for tuned circuits or RF bias networks where the inductor's parasitic resistance broadens the resonance. The unshielded construction means the magnetic field extends beyond the body — keep a 2-3 mm keep-out zone from adjacent sensitive traces or other magnetics to avoid coupling.
Supplied on tape and reel (cut tape available), the 1206 package is compatible with automated pick-and-place at standard speeds.