The S25FL128SDPMFIG00 is a 128 Mbit NOR Flash memory from Infineon's FL-S series, organized as 16M x 8 bits and accessed through an SPI-compatible serial interface that supports Quad I/O for higher read throughput. The 66 MHz clock frequency, combined with Quad I/O, delivers a sustained read rate around 33 MB/s — enough for code shadowing in embedded systems or storing configuration data in networked devices.
Package and footprint fit
The wide SOIC-16 is larger than the narrow 150-mil SOIC, so a board layout designed for the narrow version will need a pad pattern adjustment — verify the land pattern before committing the PCB.