6.8 µH power line filter with a 450 mA DC bias ceiling
The Murata LQH43NN6R8M03L is a drum core wirewound inductor in the LQH43 series, delivering 6.8 µH ±20% inductance with a 450 mA current rating. That 450 mA figure is the DC bias ceiling — push past it and the inductance collapses as the core saturates, so the real-world filter current must stay below this limit with margin for ripple. The 500 mOhm maximum DCR sets the resistive loss: at 450 mA the I²R loss is 0.1 W, which the 1812 body dissipates into the board copper. The unshielded construction means the magnetic field radiates — keep sensitive traces and other inductors a board-width away to avoid coupling.
Self-resonant frequency and usable band
The self-resonant frequency is 31 MHz. Above that point the inductor behaves capacitively and the impedance drops, so the effective filtering band stops well below 31 MHz. The Q factor is 30 at 1 MHz, which tells you the core loss at that test frequency — adequate for a general-purpose power rail filter but not a tuned tank circuit.
Active production — BOM-stable for design-in
The LQH43 family includes other inductance values and tolerances, but a pin-compatible drop-in with the same 6.8 µH and 450 mA rating would need the same footprint and DCR profile — confirm the BOM position against the datasheet before committing.