Core construction and what it means for your filter
The LQH43NN1R8M03L is a drum-core, wirewound inductor in Murata's LQH43 series. The ferrite core and unshielded construction mean the magnetic field extends beyond the component body — keep a clearance zone around adjacent traces or other magnetics to avoid coupling. Rated 1.8 µH at 1 MHz test frequency, it carries 500 mA DC current before the inductance drops due to saturation or self-heating. The 300 mOhm max DCR sets the copper loss: at full rated current the I²R loss is 75 mW, negligible in most power rails but worth factoring into a low-voltage supply budget. The self-resonant frequency of 75 MHz is well above the switching frequencies of typical DC-DC converters (500 kHz to 2 MHz), so the inductor behaves as a pure inductance in that band. The Q factor of 20 at 1 MHz indicates moderate energy storage efficiency — adequate for general-purpose filtering and decoupling.
The footprint matches the industry-standard 1812 land pattern — no special pad geometry needed. The unshielded body means the inductor's magnetic field can couple into nearby loops — maintain a keep-out zone of at least one body width around the part on the layout.
Pricing and lead time are confirmed at quote time against your BOM quantity — sourced through authorized and independent distribution channels.