The ATTINY43U-SU is an 8-bit, RISC-based microcontroller from Microchip Technology. It features a low-power AVR core, with 8KB of Flash memory and 512 bytes of SRAM. It also comes with an 8-bit counter/timer, four programmable input/output ports, and an 8-channel 10-bit A/D converter. The microcontroller is available in a variety of packages, including the tiny SOIC-8, SSOP-20, and MLF-8. It is mainly used in applications requiring less memory, such as remote sensors, security systems, and motor control.