AM29F040B-55EC – AMD

The AM29F040B-55EC is a 4-Mbit (512 K x 8-bit) CMOS flash memory device manufactured by AMD. It features a 55 ns access time, specified by the “-55” designation, enabling high-speed read operations. The “EC” suffix likely denotes an extended commercial temperature range (-40°C to +85°C), suitable for applications beyond standard consumer environments. This device utilizes a 5.0 V single power supply for operation and programming. The AMD/9941 VACUM PK of 780 indicates a manufacturing date code (week 41 of 1999) and that the devices were packaged under vacuum, likely to prevent moisture absorption during storage and shipping. The package contains 780 individual AM29F040B-55EC flash memory ICs. The device supports sector protection features to prevent accidental program or erase operations on critical memory regions.