47 µH wirewound for power and signal filtering
The LQH43NH470J03L is a 47 µH unshielded wirewound inductor from Murata's LQH43 series, built on a ferrite drum core. It carries a 210 mA continuous current rating with a maximum DC resistance of 1.044 Ohm — the DCR figure sets the I²R loss floor for a given load, so at 210 mA the self-heating is roughly 46 mW, negligible in most surface-mount layouts. The 1812 (4532 Metric) footprint is a common power-inductor size, making it a drop-in candidate for many existing DC-DC converter or EMI filter BOM positions.
Self-resonant frequency and Q factor — bandwidth limits
The self-resonant frequency (SRF) is 10 MHz, which caps the usable frequency range — above SRF the inductor behaves capacitively, so this part is suited for switching regulators switching below 2–3 MHz or for filtering in the low-MHz band. The Q factor is 35 at 1 MHz, a moderate figure for a wirewound ferrite-core inductor; it reflects the core loss and winding resistance at that frequency. Inductance is tested at 1 MHz, and the ±5% tolerance is tight enough for resonant tank circuits or precision filtering where the inductance value must stay within a narrow window across temperature and bias current.