Power rail filtering with AEC-Q200 margin
The Murata LQH2HPZ1R5MGRL is a 1.5 µH shielded wirewound inductor in the LQH2 series, rated for 1.85 A continuous with a saturation current floor of 1.7 A. The 104.4 mOhm max DCR sets the DC conduction loss budget — at full rated current the I²R loss is about 0.36 W, which the 1008 (2520 Metric) body dissipates without exceeding the 105°C operating ceiling. For a DC-DC converter feeding a 3.3 V rail in an engine-ECU or ADAS camera module, the 1.85 A rating leaves headroom above the typical 1.2–1.5 A load, and the shielded ferrite core contains the flux so the inductor does not couple noise into nearby sensitive analog traces.
Saturation headroom and SRF check
The 1.7 A saturation current is only 8 % below the 1.85 A continuous rating — a tighter margin than many power inductors. If the peak inductor current in your buck converter hits 1.6 A at startup or during a load transient, the inductance will have already rolled off by about 10 % from the 1.5 µH nominal. The self-resonant frequency of 90 MHz is well above the 1–4 MHz switching frequencies typical of automotive-grade converters, so parasitic self-resonance is not a concern in that band. The inductance is tested at 1 MHz, which matches the common switching frequency of many automotive POL converters.