10 µH shielded inductor for DC-DC input/output filtering
The Murata LQH43PN100M26L is a 10 µH shielded wirewound inductor in the LQH43 series, built for surface-mount power supply filtering where the 1.17 A continuous current rating and 1.05 A saturation floor define the load envelope.
Saturation current and DC bias margin
The saturation current of 1.05 A is the point where inductance drops by a specified percentage under DC bias — for a rail drawing 900 mA steady-state, the part holds 10 µH with margin; a 1.2 A transient pushes the core into saturation and the inductance collapses, which a downstream regulator sees as a current spike. The self-resonant frequency of 20 MHz means the inductor behaves as an inductor up to roughly 20 MHz; above that the parasitic capacitance dominates and the impedance rolls off — relevant for switching converters running above 2 MHz where the SRF must be at least 5× the switching frequency to keep the impedance inductive.
1812 footprint and board integration
The ±20% tolerance on the 10 µH nominal is standard for power-grade inductors — the actual value at 1 MHz test frequency can range from 8 µH to 12 µH, which the downstream converter's control loop must accommodate without going unstable.