27 µH, 300 mA — the DC bias and loss budget
The Murata LQH43NN270K03L is a drum core wirewound inductor in the LQH43 series, wound on a ferrite core and housed in an unshielded 1812 (4532 Metric) surface-mount package. Rated at 27 µH ±10% with a maximum DC resistance of 1.1 Ω and a current rating of 300 mA, this inductor is sized for power-supply filtering or DC-DC converter output stages where the DC bias current stays under the 300 mA ceiling and the I²R loss at full load (about 99 mW) is within the board's thermal budget. The self-resonant frequency of 14 MHz and a Q factor of 35 at 1 MHz tell you the useful inductance holds up well into the low-MHz switching range — above 14 MHz the part becomes capacitive, so keep the ripple frequency below that for a clean filter response.
Unshielded — what that means for layout
Unshielded construction means 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 coupling.