256 Mbit NOR Flash with Quad I/O SPI at 133 MHz
It uses a SPI interface with Quad I/O support, allowing four-bit-wide data transfers for higher read throughput compared to standard SPI. The 133 MHz clock rate delivers effective read speeds suitable for fast boot, code shadowing, or configuration storage in embedded systems. It operates from a 2.7 V to 3.6 V supply and is rated for the industrial temperature range of -40 to 85 °C, making it a fit for outdoor telecom, factory automation, and industrial control equipment where reliable non-volatile storage is needed.
The S25FL256SAGMFAG11 carries an EOL hot lifecycle marker, indicating that Infineon has announced end-of-life for this specific ordering code. Production may be winding down or subject to last-time-buy windows. For new designs or long-life programs, a pin-compatible replacement should be evaluated. No official successor part number is recorded in the available evidence, so cross-referencing the FL-S family for a similar density and interface is recommended for continuity planning.