The SST39VF3201-70-4C-B3KE is a 4M-bit CMOS flash memory manufactured by Microchip. It uses a 512Kb x 8-bit structure, organized as 8-bit blocks, and has 70-nanosecond access time. This memory is suitable for code and data storage in embedded systems and other applications. It has a hardware reset pin, hardware write protection pin, optional power-on reset, and is available in a 44-pin PLCC package. The SST39VF3201-70-4C-B3KE can operate in temperatures ranging from -40°C to +85°C.