100 µH, 190 mA — the load-bearing numbers
The LQH43CN101K03L is a drum core wirewound inductor rated at 100 µH ±10%, tested at 1 MHz. At 190 mA continuous current, the 2.2 Ohm max DCR sets a conduction loss of roughly 80 mW — that is the heat the core and winding must shed inside a 1812 footprint. Self-resonant frequency is 6.8 MHz. Above that, the inductor behaves capacitively, so the usable bandwidth for filtering or DC-DC smoothing stops well below that ceiling — typically half the SRF for a margin. The ferrite core material saturates gradually; the 190 mA rating already accounts for the inductance roll-off at rated current.
1812 footprint and board-fit
Surface-mount in a 1812 (4532 Metric) package — 4.50 mm x 3.20 mm, seated height 2.80 mm max. The unshielded construction means magnetic flux couples into nearby traces and components; keep sensitive low-level analog or RF paths at least one package width away.
Murata lists the LQH43CN101K03L as Active. The base product number LQH43CN covers the 1812 footprint family; the 101 suffix encodes 100 µH, K for ±10% tolerance, and 03L for the packaging variant. Cross-referencing against the full LQH43CN datasheet confirms the same core and winding construction across the range.