PIC18F26/45/46/55/56Q24 Microcontrollers Microchip Technology PIC18F26/45/46/55/56Q24 Microcontrollers are part of the PIC18-Q24 microcontroller family of 28/40/44/48-pin devices for sensor-interfacing, real-time control, and communication applications. The MCUs offer up to 32KB of memory, 4KB of Data SRAM, and 512B of EEPROM. The devices have 24, 35, or 43 I/O pins, including 4 or 12 MVIO pins powered by VDDIO2.