82 µH, 170 mA — what the ratings mean for the BOM line
The LQH43NN820J03L: The 82 µH inductance at 1 MHz test frequency places this part squarely in the filtering and DC-DC output choke space — think LC filters on a 5 V rail or the storage inductor in a low-power buck converter where the ripple current stays under 170 mA. 170 mA continuous current rating with a 2.2 Ohm max DCR means the self-heating at full load is about 64 mW (I²R). In a dense SMD layout, that heat dissipates through the 1812 pad set — no special thermal management needed, but the unshielded construction means the flux couples into nearby traces and components, so keep sensitive analog or RF routing clear of the magnetic field. The Q factor of 35 at 1 MHz is moderate — adequate for general-purpose filtering but not a high-Q resonant tank. Self-resonant frequency at 7.5 MHz tells you the useful inductive region stops well below that; above SRF the part looks capacitive.
Murata lists the LQH43NN820J03L as an active product. The 1812 (4532 Metric) footprint is a standard, widely second-sourced package size. If supply tightens, parametric equivalents from other manufacturers (same inductance, current, DCR, footprint) are cross-shop candidates — but no official Murata second-source or direct replacement is listed.
Sourcing and availability — quoted to order
Available in Tape & Reel (TR) or Cut Tape (CT) packaging per the listing. Standard reel quantities apply; lot traceability and date code freshness are confirmed at order placement.