18 µH drum-core wirewound for DC-DC filtering and bias-T applications
The Murata LQH43MN180K03L is a drum-core wirewound inductor in the LQH43 series, delivering 18 µH ±10% in an unshielded 1812 (4532 metric) SMD package. Rated for 340 mA continuous DC current with a maximum DC resistance of 820 mOhm, this part suits power-supply filtering, DC-DC converter output chokes, and bias-T circuits where the inductance value and current rating align with the rail budget. The ferrite core material and wirewound construction yield a self-resonant frequency of 17 MHz and a Q factor of 35 at 1 MHz, giving predictable impedance up through the low-MHz band.
Unshielded construction and layout implications
Because this inductor is unshielded, the magnetic field radiates from the drum core — adjacent traces carrying sensitive analog signals or high-impedance nodes should be kept at least one component width away to avoid parasitic coupling.