240 nH, 4.2 A — the DCR tells the efficiency story
The DFE2MCAHR24MJ0L is a 240 nH shielded power inductor in Murata's DFE2M series, rated for 4.2 A continuous with a saturation current of 5 A. The 25 mOhm max DCR keeps I²R losses low in a 4.2 A rail — at full load the copper loss is roughly 0.44 W, which the metal-core construction and 0806 footprint dissipate without exceeding the 150°C temperature ceiling.
AEC-Q200 and 150°C rating — where this part lives
The -40°C to 150°C operating range covers under-hood and engine-bay ambient — the 150°C ceiling is the component temperature, not just ambient, so the self-heating from the 4.2 A load is budgeted into that limit. The shielded metal-core construction contains the magnetic field, reducing EMI coupling to nearby traces — important in a dense ECU or ADAS sensor module where inductor radiation can inject noise into the analog front-end or CAN bus.