15 µH wirewound inductor with automotive-grade qualification
The Murata LQH43NH150J03L is a drum core wirewound inductor in the LQH43 series, offering 15 µH inductance with ±5% tolerance in a standard 1812 (4532 metric) surface-mount package. Rated for 390 mA continuous current with a maximum DC resistance of 360 mOhm, this part suits power-supply filtering and DC-DC converter output stages where the current draw stays under the rating.
Frequency response and AC losses
The self-resonant frequency of 19 MHz sets the upper bound for inductive behaviour — above this frequency the part looks capacitive, so keep the switching or ripple frequency below 19 MHz to maintain the intended filtering action. A quality factor (Q) of 35 at 1 MHz indicates moderate AC loss at that frequency; for resonant tank circuits or RF bias feeds, the Q figure helps estimate the insertion loss and bandwidth. The ferrite core material and unshielded construction mean the inductor radiates a small magnetic field — keep sensitive traces or other magnetics at least a few millimetres away on the PCB to avoid coupling.