BUY M29F400BB-55M3 https://www.utsource.net/itm/p/468883.html
4 Mbit 512Kb x8 or 256Kb x16, Boot Block Single Supply Flash Memory
The M29F400BB-55M3 is a 512 K x 8 bit high speed CMOS Flash memory device made with STMicroelectronics's advanced dual-transistor floating gate technology. This device is organized as 131072 words by 8 bits and is designed to extend from 55 ns access time products. Description: The M29F400BB-55M3 is a 512K × 8 bit high-speed CMOS Flash memory device fabricated by ST Microelectronics and is based on their advanced dual-transistor floating gate technology. It is available in a 44-pin Plastic Small Outline Package (SOP) with a maximum access time of 55 ns. This device has a total storage capacity of 131072 words, each of which is 8 bits wide. Features: Single 2.7V - 3.6V power supply Temperature range of -40°C to 85°C Low power consumption of 15 mA (maximum) Internal weak program/erase verification Self-aligned programming High speed program/erase controllability Low-voltage program/erase (2.7V - 3.3V) 1000 write/erase cycles Data retention of > 10 years Pin compatible with both M29F400BB-55 and M29F400BT-55 devices Applications: The M29F400BB-55M3 is ideal for use in automotive electronics, industrial and medical devices, consumer electronics, networking, and other applications which require advanced data storage and retrieval with a minimum of power consumption. (For reference only)