47 µH, 240 mA — saturation headroom check
The LQH3NPN470MJRL: This shielded ferrite-core inductor is rated for 47 µH at 1 MHz test frequency with a ±20% tolerance. The continuous current rating is 240 mA, while the saturation current (Isat) is 360 mA. The 120 mA gap between rated and saturation current means the inductance holds flat up to about 240 mA; above that, the ferrite core begins to saturate and inductance drops off. For a DC-DC converter output or a power rail filter, the peak inductor current should stay below the 240 mA mark to avoid efficiency loss. The DC resistance is 1.2 Ohm maximum. At full rated current, the copper loss is I²R = (0.24 A)² × 1.2 Ω ≈ 69 mW. In a dense PCB layout with limited airflow, that self-heating adds to the ambient temperature and must be accounted for in the thermal budget, particularly when the part is operated near the 105°C upper limit.
Shielded ferrite — keeps fields contained
The LQH3NPN470MJRL is a shielded drum-core wirewound inductor. The ferrite shield contains the magnetic flux, so this part can be placed adjacent to other magnetics, sensitive analog traces, or RF circuits without coupling noise into them. The trade-off is that ferrite cores saturate more abruptly than iron-powder or composite cores, so the saturation current ceiling is a hard limit — exceeding it collapses the inductance and may cause the downstream circuit to lose regulation.
1212 footprint, 1.20 mm profile
The low profile suits height-constrained designs such as portable electronics, thin-profile modules, or stacked-board assemblies.
Temperature grade and operating range
The operating temperature range spans -40°C to +105°C. This covers most industrial environments and under-hood automotive applications, but the 105°C ceiling means the part is not rated for engine-bay hotspots or high-temperature industrial processes above that. The self-resonant frequency is 10 MHz — above this frequency the inductor behaves capacitively, so it is suitable for power filtering up to a few MHz but not for RF or high-frequency signal paths above 10 MHz.