1 µH, 510 mA — the load-line and frequency ceiling
The Murata LQH31CN1R0M03L is a 1 µH unshielded wirewound inductor in the LQH31 series, built on a ferrite drum core and wound for a 510 mA continuous current rating. The 364 mOhm max DCR sets a hard I²R loss floor — at 510 mA the copper loss is about 95 mW, which the 1206 package must dissipate without exceeding the 85°C ambient ceiling. With a self-resonant frequency of 100 MHz, this inductor is usable well into the VHF band — the inductive impedance dominates below SRF, making it suitable for DC-DC converter output filters and RF bias-T circuits where the operating frequency stays under 50 MHz.
Last Buy — the procurement window is closing
Murata has placed the LQH31CN1R0M03L on Last Buy status — the manufacturer is no longer accepting new orders for ongoing production, so remaining inventory is the final available stock.
Unshielded construction and 1206 footprint — layout implications
The unshielded ferrite core means magnetic flux couples into nearby traces — keep sensitive analog or high-impedance nodes at least 2–3 mm from the inductor body, and avoid routing a ground plane directly underneath that would act as a shorted turn.