2.2 mH, 30 mA — where the DCR sets the limit
The Murata LQH43NH222J03L is a drum-core wirewound inductor in the LQH43 series, delivering 2.2 mH inductance in a standard 1812 surface-mount footprint. The 30 mA current rating is the DC bias ceiling — at that current the 36.72 Ohm max DCR produces an I²R loss of roughly 33 mW, which is the dominant self-heating term in free-air mounting.
AEC-Q200 qualification and temperature range
This inductor carries AEC-Q200 qualification, the automotive passive-component stress-test standard covering thermal shock, vibration, moisture resistance, and solder heat.
Self-resonant frequency and Q factor
The self-resonant frequency of 1.3 MHz defines the upper bound for inductive behaviour — above this frequency the parasitic capacitance dominates and the part behaves as a capacitor. The Q factor of 40 at 252 kHz indicates moderate efficiency in resonant tank circuits at that frequency, but the high DCR limits the achievable Q in low-impedance paths.