12 µH wirewound for DC-DC filtering and signal conditioning
The Murata LQH43MN120K03L is a drum core wirewound inductor in the LQH43 series, delivering 12 µH ±10% inductance in an unshielded 1812 footprint. Rated for 380 mA continuous current with a max DCR of 620 mOhm, this part suits power rail filtering and low-current DC-DC converter output stages where the self-resonant frequency of 21 MHz keeps the inductor effective well into the switching noise band. The ferrite core material and wirewound construction give a Q factor of 35 at 1 MHz, which matters when the inductor sits in a resonant tank or impedance-matching network — the Q directly sets the bandwidth and insertion loss.
Unshielded trade-off and board integration
Unshielded construction means the magnetic field radiates into the surrounding PCB area — keep sensitive analog traces or high-impedance nodes at least one package width away to avoid coupling.