2.2 µH shielded power inductor for DC-DC converter rails
The Murata DFE252012P-2R2M=P2 is a shielded drum-core wirewound inductor rated 2.2 µH ±20%, with a continuous current rating of 2.2 A and a saturation current of 3 A. The iron powder core and flat-wire winding keep the profile at 1.20 mm seated height, fitting under low-clearance components on a 2.50 x 2.00 mm footprint.
Where does the 2.2 A rating govern the BOM decision?
The 2.2 A current rating is the thermal limit at 125 °C ambient — the inductor's self-heating plus ambient must stay below the 125 °C operating ceiling. The 3 A saturation current is the point where inductance drops by 30 % typical; for a buck converter running at 1 MHz with a 2 A load, the peak inductor current stays below 2.5 A, leaving margin to saturation. The 84 mOhm DCR contributes to the converter's efficiency — at 2 A the copper loss is 0.34 W, which the 1008 footprint sinks through the PCB pad and via array.
Active lifecycle and sourcing posture
The DFE252012P series is a standard catalog line; the part is sourced through authorized and independent distribution.
Shielded construction and temperature range
The shielded drum core contains the magnetic field within the inductor body — important when the inductor sits next to a sensitive analog rail or a wireless transceiver on the same board.