256 Mbit automotive NOR Flash in a 16-SOIC footprint
It uses the SPI protocol with Quad I/O and QPI support, clocked at 133 MHz, and is organized as 32M x 8 bits.
133 MHz Quad SPI — read throughput for fast boot and OTA
The 133 MHz clock frequency on the Quad I/O interface delivers a sustained read throughput that keeps the host processor fed during code shadowing or over-the-air update staging. The Quad I/O and QPI modes reduce the pin count to four data lines, which simplifies board routing compared to a parallel NOR interface. For the firmware engineer, this means the Flash can serve as execute-in-place (XIP) memory with minimal wait states at the rated clock.
The AEC-Q100 automotive grade is the key differentiator for this part. For a procurement buyer, this qualification also simplifies the PPAP submission process because the part carries the required automotive certification from Infineon.
There is no end-of-life notification or last-time-buy window to manage. The base product number S25FL256 covers a family of density and package variants, so if a different footprint or temperature grade is needed later, the migration stays within the same qualification envelope.
Package and mounting: 16-SOIC wide-body
No exposed thermal pad — the package relies on the leadframe for heat conduction, so the board layout should include adequate copper pour on the SOIC footprint for thermal relief.