2Kbit SPI EEPROM for configuration and parameter storage
The Microchip AT25020B-SSHL-B is a 2Kbit serial EEPROM with an SPI interface, organized as 256 x 8 bits. The 20 MHz SPI clock rate supports fast read and write access for boot parameters, calibration constants, or device configuration data.
The wide 1.8V to 5.5V supply range means the same BOM line works across a 3.3V MCU rail and a 5V legacy bus without a regulator change.
Write cycle timing and endurance context
For applications that write calibration data at power-up or log occasional events, the write time is not a bottleneck. If the design writes frequently during operation, budget the 5ms delay per page and consider sector wear leveling in firmware.
Housed in an 8-SOIC (0.154", 3.90mm width) package, surface-mount, supplied in Tube. The footprint is standard for 8-pin SOIC and shares the same land pattern as the AT25020B-SSHL-T tape-and-reel variant, so a single PCB layout covers both ordering options.
Microchip lists the AT25020B-SSHL-B as Active.