1.5 µH, 445 mA — the DCR is the limiter
The LQH2MCN1R5M02L is a Murata LQH2-series drum-core wirewound inductor, rated 1.5 µH at 1 MHz test frequency with ±20% tolerance. The 445 mA current rating is the DC current at which the inductance typically drops by 10% — it is not a thermal limit. The real thermal ceiling is the 520 mOhm maximum DCR; at 445 mA the self-heating is about 103 mW, which is manageable in the 0806 body, but if your circuit draws 445 mA continuously, the temperature rise inside the part will be noticeable. This is an unshielded part — the ferrite core does not have a magnetic shield, so the flux field extends beyond the package. Keep it away from sensitive traces or other magnetics on the board, or budget for crosstalk at the layout stage.
Self-resonant frequency and where it matters
The self-resonant frequency (SRF) is 95 MHz. Above this frequency the inductor behaves capacitively, so the 1.5 µH value is only valid well below 95 MHz. For a DC-DC converter switching at 2–4 MHz, the SRF gives plenty of headroom. For RF filtering at, say, 900 MHz, this part is useless — the impedance is capacitive there. If your board sees sustained 85°C ambient, the DCR will drift higher and the current derating curve should be consulted.
