512Kbit SPI NOR flash in 8-SOIC
The Microchip SST25VF512A-33-4C-SAE-T is a 512Kbit serial NOR flash organized as 64K x 8 bits, communicating over an SPI bus at up to 33 MHz.
33 MHz SPI bus and 20 µs page write
The 33 MHz SPI clock rate gives a sustained read throughput of roughly 33 Mbit/s in single-I/O mode — enough for code shadowing or parameter storage in a Cortex-M host that runs its own flash at a lower speed. Page write time is 20 µs typical, which keeps the firmware-update or data-logging write cycle short; the erase time is not listed here, but the fast page program means the SPI bus is not tied up long per write.