Obsolete — sourcing through surplus channels
Murata has marked the DFEH10040D-8R2M=P3 as obsolete, meaning no further factory production runs are planned. For a BOM that requires this exact inductance and current rating, the supply path is independent surplus inventory — sealed reels with consistent date-codes are the preferred lot condition, and availability is confirmed at RFQ against the specific quantity needed.
8.2 µH, 5.9 A — what the ratings mean for the DC-DC rail
The 8.2 µH inductance at ±20% tolerance and 5.9 A continuous current rating make this a mid-current power inductor for a buck converter or filter choke in an automotive or industrial supply rail. The saturation current of 7.4 A (Isat) is the hard ceiling — above that the inductance collapses, so the peak load transient must stay under that figure to keep the output ripple within regulation. Maximum DC resistance of 29 mOhm sets the copper loss at full load: at 5.9 A the I²R loss is about 1 W, which the 10.9 mm × 10.0 mm × 4.0 mm package must dissipate through the board copper. The iron-powder core material handles the DC bias without saturating prematurely, and the shielded construction keeps the magnetic field from coupling into adjacent traces or components.
AEC-Q200 — automotive-grade reliability
Qualified to AEC-Q200, the passive-component stress-test standard for automotive electronics. This means the part has passed thermal shock, humidity bias, vibration, and solder-heat reflow tests at the -40°C to +155°C operating range — suitable for under-hood or engine-bay DC-DC converters where ambient temperatures exceed 105°C.