2 Mbit SPI Flash in an 8-SOIC — what this part is
The AT45DB021E-SSHN2B-T is a 2 Mbit serial flash memory that communicates over an SPI bus at up to 70 MHz. It is organized as 256 bytes per page across 1024 pages.
Supply voltage and temperature — why they matter for your BOM
Write cycle timing — planning the firmware update strategy
Page writes complete in 3 ms typical, and byte/word writes take 8 µs. That is fast enough for over-the-air update staging: you can buffer a 256-byte sector in SRAM and commit it in a few milliseconds. If your application does frequent small writes, the 8 µs word write keeps the bus transaction short, reducing the chance of a watchdog timeout.
The sibling AT45DB021E-SSHN-T shares the same 2 Mbit frame size, 70 MHz SPI interface, and 8-SOIC package.