3.3 µH wirewound in 0806 — what the ratings mean for the DC-DC rail
The Murata LQH2MCN3R3M52L is a 3.3 µH drum-core wirewound inductor in the LQH2 series, built for surface-mount DC-DC filtering and power-line decoupling where board space is tight. Rated at 360 mA with a maximum DC resistance of 962 mOhm, the I²R loss at full rated current is about 125 mW — within the 0806 body's thermal budget for a typical 85°C ambient, but the DCR dominates the efficiency in a low-voltage rail.
Self-resonant frequency and the unshielded trade-off
The self-resonant frequency is 110 MHz, which means the inductor behaves as an inductor well into the VHF band — suitable for filtering noise on a 1–10 MHz switching regulator output, but the unshielded construction means flux couples into adjacent traces, so keep sensitive analog routing clear of the magnetic field. Tolerance is ±20%, typical for a power-grade ferrite-core part; the actual inductance at the 1 MHz test frequency will land between 2.64 µH and 3.96 µH, which is wide enough that the closed-loop compensation of a buck converter should be designed for the minimum value.