22 µH, 1.9 A — derating margin for DC-DC input filters
The Murata DFEH7030D-220M=P3 is a 22 µH shielded power inductor rated for 1.9 A continuous with a saturation current of 2.7 A. The 700 mA gap between rated and saturation current gives a healthy derating margin for DC-DC converter input filters where peak inductor current can exceed the average load current during transients. Maximum DC resistance is 198 mOhm — at 1.9 A the I²R conduction loss is about 715 mW, which the 3.00 mm seated height and iron-powder core must dissipate without exceeding the 155°C rated operating temperature.
AEC-Q200 and 155°C ceiling — under-hood ready
AEC-Q200 qualification certifies the part for automotive stress grades — temperature cycling, moisture resistance, and mechanical shock per the passive-component qualification standard. The -40°C to +155°C operating range places it in the under-hood or engine-bay thermal envelope, where ambient air can exceed 105°C and the inductor self-heats from conduction losses. The shielded iron-powder core contains the magnetic field within the 7.00 mm x 6.60 mm footprint, reducing EMI coupling to nearby traces — a concern when the inductor sits adjacent to sensitive analog or CAN bus lines on the same PCB.
NRND — sourcing for sustainment programs
Design engineers starting a new project should evaluate the current DFEH7030D family portfolio for an active pin-compatible alternative; the 22 µH, 1.9 A, 7.00 mm x 6.60 mm footprint is a common power-inductor slot that multiple Murata series fill.