2.2 µH shielded power inductor for DC-DC rail filtering
The Murata LQH32PN2R2NNCL is a 2.2 µH shielded wirewound inductor in the LQH32 series, rated for 1.85 A continuous current with a saturation current floor of 2 A.
Current handling and DC resistance — the thermal budget
Rated current of 1.85 A and saturation current of 2 A are close — the inductor core saturates just 8% above the continuous rating. In a buck converter that peaks at 2 A during startup or transient, the inductance will drop below 2.2 µH, increasing ripple current. The 76.8 mΩ DCR at 1.85 A dissipates about 260 mW; in a 1210 footprint without forced airflow, that heat must conduct through the PCB copper to stay within the 85°C ambient ceiling.
Shielding and self-resonant frequency
Shielded construction contains the magnetic field, so the inductor can sit adjacent to other magnetics or a sensitive analog trace without coupling noise. The 70 MHz self-resonant frequency is well above the switching frequency of most DC-DC converters (typically 500 kHz to 2 MHz), so the inductor behaves as a pure inductance in-band.
Package and footprint — 1210 (3225 metric)
The ferrite core and wirewound construction mean the part is not magnetically shielded by a metal cap — the ferrite drum itself provides the shielding, so the PCB copper pour under the part should be solid to avoid eddy-current losses.