27 µH wirewound for power and signal filtering
The LQH43MN270K03L is a 27 µH unshielded drum-core wirewound inductor in the Murata LQH43 series, built on a ferrite core. Rated for 300 mA DC current with a maximum DCR of 1.1 Ohm, this part suits low-to-moderate current rails where resistive loss and self-heating must be budgeted — a 300 mA load sees roughly 99 mW of copper loss at the DCR ceiling. The self-resonant frequency of 14 MHz defines the upper usable band; above that the inductive reactance rolls off into capacitive behaviour, so keep the switching or signal fundamental well below that corner. A Q factor of 35 at 1 MHz indicates moderate selectivity — adequate for resonant tank circuits or EMI filtering at frequencies near the test point, but not a high-Q narrowband part.
Board-fit and sourcing
Supplied on tape and reel (cut tape option available); the base product number LQH43MN covers the family variants, and this specific inductance-tolerance combination is order-code LQH43MN270K03L.