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BUY M29F400BB55M1 https://www.utsource.net/itm/p/4825320.html
4 Mbit 512Kb x8 or 256Kb x16, Boot Block Single Supply Flash Memory
Description: 4M-bit (512K x 8-bit) CMOS 5.0 Volt-only Boot Sector Flash Memory Features: - Fast access time: 55ns - Low power consumption: Active current: 45mA (typical) - Endurance: 100,000 program/erase cycles - Data retention: 20 years - Package: 44-pin SOP Application: - Automotive electronics - Industrial control - Consumer electronics - Networking equipment - Medical electronics - Telecommunications (For reference only)