470 µH, 40 mA, AEC-Q200 — what the numbers decide
The LQH32NH471J23L is a drum-core wirewound inductor rated at 470 µH with a 40 mA current rating and 16.92 Ω max DC resistance — the DCR sets the I²R heating floor, so the 40 mA limit is the continuous current at which the temperature rise stays within the ferrite core's thermal budget. AEC-Q200 qualification means this part is characterized for automotive passive-component stress tests — thermal shock, 85/85 humidity bias, and vibration — so it can be placed in an under-hood or cabin ECU without requalifying the inductor. The 5 MHz self-resonant frequency and Q of 50 at 1 MHz tell you the inductor behaves as an inductor up to about 5 MHz; beyond that, parasitic capacitance dominates and the impedance rolls off — relevant if the switching frequency of the downstream converter or filter is near that band.
Surface-mount, unshielded — the open magnetic path means stray flux couples into nearby traces and components; keep 1-2 mm clearance from the inductor body to sensitive analog or RF routing.