680 µH at 65 mA — what the DC resistance means for your rail
The LQH43NN681K03L is a drum core wirewound inductor from Murata's LQH43 series, wound on a ferrite core and unshielded. Its 680 µH inductance is tested at 1 kHz, and the 17 Ohm max DCR is the figure that governs the DC voltage drop across the part at the 65 mA rated current — at full load the inductor drops just over 1.1 V, which eats into the available supply headroom if the rail is tight. The self-resonant frequency of 2.5 MHz sets the upper bound for useful filtering — above that the inductor behaves capacitively. The Q factor of 40 at 796 kHz tells you the loss tangent in the passband is moderate; this part is sized for DC-DC output filtering or general-purpose EMI suppression where the switching frequency stays well below the SRF.
1812 footprint, surface-mount, unshielded — board-fit constraints
The unshielded construction means the magnetic field radiates into the surrounding board area — keep sensitive traces or low-level analog circuits at least one body width away to avoid coupling.