256 Mbit NOR Flash with a 133 MHz quad-SPI pipe
The Infineon S25FL256SAGMFI000 is a 256 Mbit (32M x 8) FL-S series NOR Flash memory that talks over a standard SPI or quad-I/O interface at up to 133 MHz. That clock rate translates to a read throughput around 66 MB/s in quad mode — enough to feed a high-end MCU or FPGA configuration engine without stalling.
At 133 MHz in quad-I/O mode, the S25FL256SAGMFI000 can sustain a read throughput that keeps a Cortex-M7 or a mid-range FPGA configuration controller fed without wait states. The SPI interface is standard — any MCU with a quad-SPI peripheral can drive it. The 256 Mbit density (organized as 32M x 8) gives you 32 MB of code or data storage, which is a common size for firmware images with OTA staging, bootloaders, and file-system partitions. The erase granularity (typically 4 KB and 64 KB sectors on this family) matters when you size the OTA staging area — the smaller sector size reduces write amplification for frequent small updates.
The FL-S series is Infineon's mainstream NOR Flash family, and this density and package variant is widely stocked across the independent distribution channel.
Package and rework — 16-SOIC wide, hot-air friendly
The leads are on a 1.27 mm pitch, which is easy to hand-solder or reflow with a hot-air station. The chamfered end marks pin 1 clearly — no orientation guesswork. The wide body also gives the part decent thermal mass; it does not heat-soak as fast as a tiny QFN, which is a plus when you are reworking a board with a preheater.