390 µH at 50 mA — what that means on the bench
The LQH32MN391J23L is a 390 µH drum-core wirewound inductor from Murata's LQH32 series, rated for 50 mA continuous current with a max DC resistance of 22 Ohm. That DCR is the main loss term — at 50 mA the I²R loss is 55 mW, which is fine for a 1210 package but worth checking if your circuit runs near the current limit continuously. The unshielded construction means the magnetic field extends beyond the part — keep sensitive traces or other magnetics a few millimeters away, especially if you are routing near a wireless front-end or another inductor.
Q factor and self-resonant frequency — where it works
Q is 50 at 796 kHz, which is decent for a 390 µH part in this footprint — the core loss and winding resistance balance out around that frequency. The self-resonant frequency is 5 MHz, so the inductor starts to look capacitive above that; keep your switching or signal frequency well below 5 MHz to stay in the inductive region. If your design sees the upper end of that range, the inductance holds within the ±5% tolerance band.
It ships in tape-and-reel or cut-tape options, so it fits both prototyping and volume reflow. The 1210 (3225 metric) footprint is standard — no special pad geometry needed.