BUY M29F400BB-70N1 https://www.utsource.net/itm/p/468888.html
4 Mbit 512Kb x8 or 256Kb x16, Boot Block Single Supply Flash Memory
Description: The M29F400BB-70N1 is a 4Mb (512K x 8) Flash Memory manufactured by STMicroelectronics. It is a non-volatile memory device that is organized as 512K words of 8 bits each. Features: - Fast access time: 70ns - Low power consumption - Single supply voltage: 2.7V to 3.6V - Low voltage programming - Program and erase suspend - Program and erase cycles: 10,000 - Endurance: 100,000 - Data retention: 20 years Applications: - Automotive - Industrial - Consumer - Medical - Telecommunications (For reference only)