The SST89E564RD-40-C-NJE is a microcontroller from Silicon Storage Technology, Inc that is designed for embedded control applications. It features a 8051-compatible processor core, 64KB of flash memory, and 2KB of RAM. The device operates at a clock frequency of up to 40MHz and is available in a 44-pin TQFP package. With a medium popularity and limited supply and demand status, this microcontroller is a reliable option for a variety of applications.