The STMicroelectronics M95128-DRDW3TP/K is a 128 Kbit serial EEPROM with an SPI interface, organized as 16K x 8 bits.
20 MHz SPI clock and 4 ms write cycle
The 20 MHz SPI clock rate supports fast read and write operations for parameter updates during ECU boot or sensor calibration routines. The write cycle time of 4 ms per word or page sets the latency for non-volatile storage — useful for applications that log fault codes or trim values at key-off.
Housed in an 8-TSSOP (4.40 mm width) package with surface-mount termination. The 8-pin footprint is common across the M95xxx series, so a board layout for a smaller-density part can accept this 128 Kbit device without a PCB spin.
It is ROHS3 compliant.