Supply rail, package, and board-fit realities
The S25FL256SAGBHIC00: The 24-BGA package measures 8x6 mm with a 0.80 mm ball pitch — a standard 4-layer board can fan out the outer rows, but the inner balls need at least two signal layers for escape routing. It ships in a tray, not tape-and-reel — that means pick-and-place feeders need a tray feeder or a tube adapter for automated assembly.
RoHS compliance — a sourcing gotcha
If your BOM demands RoHS compliance, the sibling S25FL256SAGBHI300 shares the same 256 Mbit density, Quad I/O interface, and 133 MHz clock but in a different package variant — confirm the footprint before swapping.