At25fs040 smt serial flash 4mb atmel at25fs040n sh27 b serial flash memory 4mbit memory size 512k x 8 memory organization 2 7 to 3 6v supply voltage 10ma operating current serial spi interface 40 to 85 c temperature 8 soic package the at25fs040n from atmel is a high speed small sectored spi flash memory device that is optimised for use in a wide range of industrial and commercial applications where there is a requirement for low power low voltage operation atmel at25fsx series