470 nH, 3.4 A — the power rail inductor that is no longer in production
The Murata DFE201210S-R47M=P2 is a 470 nH shielded drum-core wirewound inductor in the 0805 (2012 Metric) footprint, rated for 3.4 A continuous current with a saturation current of 4.8 A. The 32 mOhm max DCR keeps conduction losses manageable for a 3 A rail — at full rated current the I²R loss is roughly 370 mW, which the metal-core construction and 125°C rating can handle without derating in most ambient conditions.
What the ratings mean for the DC-DC converter
The 3.4 A current rating is the thermal limit at 25°C ambient — in a 85°C environment the part derates per the standard inductor curve, but the 125°C operating ceiling gives headroom for a 12 V-to-3.3 V buck converter delivering 2 A continuous. The 4.8 A saturation current means the inductance holds within 10% of nominal up to that point; beyond it the metal core saturates abruptly, so the peak inductor current in the converter must stay under 4.8 A even during load transients. Shielded construction contains the magnetic field within the 0805 package — critical when the inductor sits next to a sensitive ADC or RF front-end on the same board. The metal core delivers higher saturation flux density than ferrite for the same volume, which is why the 0805 body can carry 4.8 A saturation without a larger footprint.
Obsolete — sourcing through independent channels
Murata has marked the DFE201210S-R47M=P2 as Obsolete. For a BOM line that requires this exact inductance, footprint, and current rating, the procurement path is spot-market sourcing — no factory lead time applies.