BLM18AG121SN1D

3V3 -> 3V3A analog-rail isolation bead (reference: HH-1M1608-121JT class)

That description comes from one board. A passive of this value does a different job on each design — see the per-board component tables below for what it does in each context.

Murata Used on 2 boards 2 placements

Value	`120R@100MHz`
Manufacturer part	`BLM18AG121SN1D`
Manufacturer	Murata
Footprint	`Inductor_SMD:L_0603_1608Metric`
KiCad symbol	`Device:FerriteBead`
Datasheet	Not applicable — generic passive or connector

Where it is used

Board	Name	References
AXC-001	W5500 SPI Ethernet PMOD module	`FB1`
AXC-002	LAN8720A RMII Ethernet PHY dual-PMOD module	`FB1`