128Kbit SPI EEPROM in a 2x3 mm package
The M95128-RMC6TG is a 128Kbit serial EEPROM from STMicroelectronics, organized as 16K x 8 bits and accessed over an SPI bus at up to 20 MHz.
SPI timing and write-cycle budget
A 20 MHz SPI clock gives a 50 ns SCK period — fast enough for firmware updates and parameter logging without stretching the bus. The 5 ms write time is typical; the part asserts a low on the DO pin during the write cycle, so the host must wait for that signal before issuing the next command.
It is supplied in Tape & Reel (also available as Cut Tape), making it a standard pick-and-place candidate for volume assembly or prototype runs.