AEC-Q200 qualified wirewound inductor for automotive and industrial supply rails
The Murata LQH43NH271J03L is a drum-core wirewound inductor in the LQH43 series, housed in an 1812 (4532 Metric) surface-mount package. It delivers 270 µH inductance with ±5% tolerance and a rated current of 90 mA. For an ECU or sensor module that must survive engine-bay or chassis-mounted thermal cycles, this is the qualification an OEM auditor will ask for by name.
DC resistance and self-resonant frequency — the trade-off that governs the filter band
The 6.6 Ohm maximum DC resistance sets the I²R loss floor: at 90 mA the winding dissipates roughly 54 mW. The self-resonant frequency is 4 MHz. Above that point the inductor behaves capacitively, so the effective filtering band for this 270 µH part sits below ~500 kHz in typical buck or EMI filter stages. The Q factor of 40 at 796 kHz confirms the core losses are well controlled in that range.