1 µH shielded power inductor for automotive and industrial DC-DC
The Murata LQH3NPH1R0MMEL is a 1 µH drum-core wirewound inductor from the LQH3 series, shielded to contain magnetic flux and rated for 3 A continuous current. The 2.35 A saturation current (Isat) sets the hard ceiling where inductance starts to roll off — stay below that in peak-load transients to keep the ripple current within the converter's stability margin. The 25 mOhm DC resistance (DCR) determines the I²R conduction loss at full load: at 3 A, that's 225 mW dissipated inside the 1212 body. For a 12 V-to-3.3 V buck running at 1 MHz, this inductor's 100 MHz self-resonant frequency leaves plenty of headroom above the switching fundamental, so the core loss stays well below the copper loss.
AEC-Q200 qualification and temperature range
Rated AEC-Q200, this inductor passed the automotive-grade stress tests: thermal shock, moisture resistance, mechanical shock, and vibration. The shielded ferrite core (material - Core: Ferrite) contains the magnetic field within the 3.00 mm x 3.00 mm footprint, so adjacent passives on a dense 1212 layout don't couple noise into the inductor's flux path. This matters in multi-phase converters where two inductors sit side by side — the shield keeps the mutual inductance below 1%.
Package, storage, and board integration
Surface-mount in a 1212 (3030 Metric) case, 3.00 mm per side, 1.50 mm seated height. Supplied on tape and reel (cut tape also available). The reel quantity suits medium-volume pick-and-place; for a prototype run, the cut tape option avoids buying a full reel. Store the reels in a dry environment — the ferrite body is not moisture-sensitive per JEDEC, but the terminations can oxidize in high-humidity storage.