1.8 µH drum-core wirewound in 1210
This Murata LQH32MN1R8K23L is a 1.8 µH drum-core wirewound inductor in a 1210 SMD package, rated for 390 mA continuous current with a maximum DCR of 700 mOhm. The ±10 % tolerance and ferrite core are standard for general-purpose power-supply filtering and DC-DC converter output smoothing where the exact inductance value is not critical.
Unshielded construction and board layout
Unshielded construction means the magnetic field extends beyond the component body — adjacent traces carrying sensitive analog signals or high-impedance nodes should maintain a clearance of at least one part width to avoid parasitic coupling. The self-resonant frequency of 60 MHz places the useful inductive impedance range below roughly 20 MHz for most power applications; above SRF the impedance becomes capacitive. With a Q factor of 20 at 1 MHz this is not a high-Q tuned-circuit inductor — it is selected for its DC resistance and current rating, not for narrowband filtering.
DC bias and thermal budget
The 390 mA current rating is the continuous DC current at which the inductance typically drops 10 % from the nominal value (self-heating limits may be reached earlier depending on PCB copper area). 700 mOhm max DCR produces an I²R loss of roughly 106 mW at rated current — this is well within the dissipation capability of a standard 1210 footprint on a two-layer board with 1 oz copper.
Production status and procurement
Listed as Active in production with no NRND or EOL notices — this part is currently available through standard Murata distribution channels.