What the 3.3 µH rating means on your board
The LQH32MN3R3K23L is a drum-core wirewound inductor from Murata's LQH32 series, built on a ferrite core and unshielded — so the magnetic field extends beyond the part body and couples into adjacent traces or components if they sit too close. Rated 3.3 µH at 1 MHz test frequency with ±10% tolerance, it carries 300 mA DC before the core saturates or the temperature rise exceeds the limit set by the 1 Ohm max DCR. That DCR figure is the one to watch for loss: at 300 mA, the I²R loss is 90 mW, which the 1210 body has to dissipate into the board copper. The self-resonant frequency sits at 38 MHz — above that, the inductor behaves capacitively. For a DC-DC converter switching at 1-2 MHz, the SRF is well clear of the switching harmonics, but at higher frequencies the impedance roll-off starts early.
Package and rework reality
1210 (3225 metric) footprint, surface-mount, nonstandard case — the pad geometry follows the standard 1210 land pattern, so no special footprint. The unshielded construction means the hot-air rework profile is straightforward: no magnetic shielding to trap heat, and the ferrite core absorbs moisture less aggressively than a polymer core, so a standard 125°C 24-hour bake before reflow is sufficient if the tape has been exposed. The ferrite core's permeability drifts with temperature, but within this band the inductance shift stays inside the ±10% tolerance for most filter and decoupling applications.
Sourcing and lifecycle posture
Listed as Active in Murata's product status — this is a current-production part, not a phase-out or NRND line. The base product number LQH32MN covers the full inductance range in this drum-core family; the 3R3 suffix identifies the 3.3 µH variant.