Inductance and DC resistance for power filtering
The Murata LQH43NH6R8J03L is a 6.8 µH drum core wirewound inductor in the LQH43 series, built for surface-mount power and signal filtering. The 216 mOhm max DCR sets the I²R loss budget — at 530 mA continuous, the self-heating from winding resistance stays under 60 mW, which is negligible in most board-level thermal profiles.
Self-resonant frequency and Q factor
The self-resonant frequency is 31 MHz, which is the ceiling for effective inductive behaviour — above that the parasitic capacitance dominates and the component behaves capacitively. For a buck converter switching at 2 MHz, the 31 MHz SRF gives over a decade of margin before the inductor loses its impedance. Q factor is 30 at 1 MHz, typical for a ferrite-core wirewound in this inductance range. The Q value matters for tuned circuits and resonant converters where the inductor's loss angle affects efficiency and bandwidth.
The unshielded construction means the magnetic field extends beyond the core — keep adjacent traces and copper pours at least one package width away to avoid eddy-current losses and unintended coupling. Surface-mount termination on a ferrite core; the reflow profile should follow the standard lead-free solder curve with a peak temperature of 260°C.