2.2 µH shielded power inductor — parametric fit for DC-DC output stages
The Murata DFE201208S-2R2M=P2 is a 2.2 µH shielded wirewound inductor in the DFE201208S series, built with a metal composite core. It is designed for surface-mount power supply filtering, typically on the output side of a buck converter where the inductor stores and releases energy to smooth the voltage rail. Rated for 1.4 A continuous current with a saturation current (Isat) of 1.8 A — the inductance value holds stable up to the saturation limit, above which the core saturates and the inductance drops sharply. The 204 mOhm maximum DC resistance sets the I²R conduction loss; at 1.4 A the self-heating from DCR alone is about 0.4 W, which must be dissipated through the PCB copper.
Obsolete — sourcing through independent channels
Murata has marked the DFE201208S-2R2M=P2 as obsolete.
0805 footprint and thermal integration
The low profile suits tight board stacks in portable or embedded designs where the component height is constrained by an enclosure or a second PCB above. The metal core material improves saturation current density over ferrite but has higher core loss at high switching frequencies — above 2–3 MHz the AC loss may dominate the thermal budget, so the 1 MHz test frequency for the inductance value is a good reference point for the intended switching range.