PIC32MX250F128B-I/SS 32bit PIC Microcontroller, PIC32MX, 40MHz, 128 kB Flash. The PIC32 range of microcontrollers from Microchip are 32-bit MCUs with a MIPS microAptiv or M4K core in combination with full range of integrated tools needed for embedded applications. The high performance offered by these devices is desirable for advanced applications such as high impact graphic/user interfaces, Ethernet/USB/CAN connectivity, multitasking embedded control and high performance audio.