22 µH shielded power inductor for automotive and industrial DC-DC stages
The Murata LQH43PH220M26L is a 22 µH drum-core wirewound inductor in the LQH43 series, shielded to contain magnetic flux and rated for 780 mA continuous DC current with a saturation floor of 700 mA.
Current rating and saturation margin
The 780 mA current rating is the DC bias at which the inductance typically drops by 10% from the nominal 22 µH value; the 700 mA saturation current is the hard limit where inductance falls sharply, so the design should keep the peak load below 700 mA to maintain regulation in a buck converter. With a maximum DC resistance of 392.4 mOhm, the I²R loss at 780 mA is about 240 mW — this self-heating raises the internal temperature above the 85°C ambient ceiling, so a derating check against the actual load current is needed for high-density boards.
Shielding and frequency response
The shielded ferrite core contains the magnetic field lines, reducing radiated EMI that would otherwise couple into adjacent signal traces or the ground plane — important when the inductor sits near a sensitive ADC or RF section on the same PCB. The self-resonant frequency of 15 MHz sets the upper bound for the inductor's impedance peak; above this frequency the component behaves capacitively, so it should not be used as a filter element in switching converters switching above a few megahertz.