68 µH, 160 mA — the sizing decision for an automotive DC-DC filter
The LQH2MPZ680MGRL is a 68 µH shielded wirewound inductor from Murata's LQH2 series, rated for 160 mA continuous DC with a maximum DC resistance of 8.04 Ohm. The 230 mA saturation current (Isat) is the hard ceiling: the inductance holds its value up to this current, then the ferrite core saturates and the inductance drops sharply. The 160 mA DC rating already includes a derating margin below saturation, so the practical operating limit is the DC rating, not the saturation number.
AEC-Q200 qualification and the 105°C ceiling
The ferrite core material and shielded construction keep the magnetic field contained within the 0806 package — important when the inductor sits next to a sensitive ADC reference or a CAN transceiver on the same board layer.
Self-resonant frequency — where the part stops being an inductor
The self-resonant frequency (SRF) is 7 MHz. Below this frequency the component behaves as an inductor with the rated 68 µH; at and above 7 MHz the parasitic winding capacitance dominates and the impedance becomes capacitive. For a buck converter switching at 2 MHz, the SRF gives plenty of headroom — the inductor's impedance stays inductive at the switching fundamental and its first few harmonics. The low profile keeps it under a 1.0 mm clearance on a two-layer board.