The SC91F731D20U is an 8KB 256Byte FLASH 18 51Series DIP-20 ROHS microcontroller unit (MCU/MPU/SOC) manufactured by SinOne. It is a low power, high performance 8-bit MCU. It offers a wide range of features including an integrated 16KB of high speed ROM, 8KB of Flash memory, 256Bytes of RAM, 18 total GPIO, Real-Time Clock, on-chip clock source & Watch Dog Timer. It also has a variety of integrated peripheral functions such as on-chip Analog-to-Digital Converter, on-chip Pulse Width Modulator, configurable I/O, UART, I²C, PCA & Bi Directional PWM. The SC91F731D20U is RoHS compliant and provides an ideal solution for a variety of applications.