What the ratings mean for the BOM line
The Murata DFE201210U-R47M=P2 is a shielded drum-core wirewound inductor in the 0805 (2012 Metric) footprint, rated 470 nH with a ±20% tolerance. The headline current rating of 3 A is the continuous DC current before the inductance drop hits the specified limit — that is the number to size against the rail's steady-state draw. The saturation current of 4.4 A is the peak the core can handle before the inductance collapses; a DC-DC converter's inductor sees peak current equal to the output current plus half the ripple, so the 4.4 A figure governs the transient and start-up margin, not the 3 A continuous figure.
DC resistance and thermal budget
42 mOhm maximum DCR at 25 °C — at 3 A the I²R loss is 0.378 W, which the 0805 body must dissipate into the board copper. The metal core and shielded construction help pull heat into the PCB plane, but the actual temperature rise depends on the trace width and via count under the part.