54 nH, 920 mA — parametric fit for RF decoupling
The LQH31HN54NK03L: It delivers 54 nH ±10% with a self-resonant frequency of 800 MHz and a DC resistance of 45.5 mOhm max — the low DCR keeps conduction loss down at the 920 mA rated current, making it a fit for RF decoupling and bias-tee circuits where the inductor sits in the signal path.
Unshielded construction and Q factor
This part is unshielded, so the magnetic field radiates from the core — a consideration for board layout when the inductor is placed near sensitive analog or RF traces. The Q factor is 50 at 100 MHz, which indicates moderate selectivity for narrowband filtering; for a 54 nH value at that frequency, the inductive reactance is about 34 ohms, and the series resistance at 100 MHz (accounting for skin effect) will be higher than the DC DCR. The ferrite core material supports the 800 MHz self-resonant frequency — above that point the inductor behaves capacitively, so the useful bandwidth for impedance matching or filtering stops well before SRF. Operating temperature range is -40°C to 85°C, covering most indoor and automotive cabin environments.
Last Buy — sourcing window is closing
Murata has placed the LQH31HN54NK03L in Last Buy status — the manufacturer is winding down production. This means the part is still orderable through distribution but will not be available once the final buy window closes. No official successor part number is listed; the LQH31 series is the family, but a direct pin-compatible replacement from Murata has not been designated. For a BOM that already uses this inductor, now is the time to secure lifetime buy quantities or qualify an alternative. The 1206 footprint is common, and other wirewound 54 nH inductors from Murata or competitors (e.g., Coilcraft, TDK) may fit the pad layout, but the DCR and SRF must match the circuit's requirements — the 45.5 mOhm max and 800 MHz SRF are the constraints.