256 Mbit NOR Flash with Quad SPI — what the 133 MHz clock buys
The S25FL256SAGNFI011 is a 256 Mbit NOR Flash from Infineon's FL-S series, organised as 32 M x 8, with a SPI Quad I/O interface clocked at 133 MHz. At that clock rate, the Quad I/O mode delivers a sustained read throughput that keeps an MCU's execute-in-place (XIP) prefetch fed without wait-state penalties — a real consideration when the bus is shared with other SPI peripherals.
Package and footprint — 8-WSON with exposed pad
The device comes in an 8-WSON (6x8 mm) exposed-pad package.
The FL-S series remains in volume production, and the base product number S25FL256 is a current catalog line. This means no last-time-buy scramble — the BOM line can be committed without obsolescence contingency.