1 µH wirewound, 1206 footprint
The Murata LQH31MN1R0K03L is a 1 µH drum-core wirewound inductor in the LQH31 series, built on a ferrite core and unshielded. It is rated for 175 mA continuous current with a maximum DC resistance of 637 mOhm — the DCR sets the I²R heating limit, so at full rated current the self-heating is roughly 19.5 mW, well within the 1206 package's dissipation capability.
Q factor and self-resonant frequency
A Q factor of 35 at 10 MHz tells you the inductor's efficiency at that frequency — the ratio of stored energy to lost energy per cycle. The self-resonant frequency is 100 MHz, so the inductor behaves inductively up to that point; above it, parasitic capacitance between windings dominates and the impedance turns capacitive. For a 1 µH part, 100 MHz SRF is typical for this core and winding geometry.
Last Buy — sourcing reality
This part carries a Last Buy lifecycle status from Murata. That means the manufacturer has announced end-of-life — the last production run is in progress or complete. Sourcing goes through independent distribution: quantities are confirmed at RFQ, and the stock is genuine, traceable Murata inventory. If you are qualifying a new design, look for a current-production 1 µH wirewound in the same 1206 footprint; if this is a BOM fill for an existing build, we can source it against your quantity.
Physical fit — 1206 SMD
It is unshielded, so keep magnetic-sensitive traces or components at least a few mm away — the stray field from an unshielded drum core can couple into adjacent loops. Operating temperature range is -40°C to 85°C, covering most indoor and outdoor equipment but not extended automotive under-hood environments.