ULN2803A by Texas Instruments is a peripheral driver with 8 functions. It has a max supply voltage of 3V and can operate in temperatures ranging from -40 to 85°C. This IC is commonly used as a buffer or inverter based peripheral driver for various applications.
2N2222A by Texas Instruments is a small signal NPN bipolar junction transistor (BJT) with a max collector-emitter voltage of 40V and a max collector current of 0.8A. It is commonly used for switching applications due to its fast turn on/off times (35ns/285ns) and high transition frequency (300MHz).
USB2514BI-AEZG by Microchip is a BUS CONTROLLER IC with 36 terminals, operating at 3.3V, supporting I2C, SMBUS, and USB buses. It has a clock frequency of up to 24MHz and can withstand industrial temperatures from -40°C to 85°C. This chip carrier package is surface mountable and suitable for various applications requiring USB connectivity.