ULN2803A smd is High-Voltage, High Current Darlington Transistor Arrays is  8 NPN Darlington connected transistors in this family of arrays are ideally suited for interfacing between low logic level digital circuitry (such as TTL, CMOS or PMOS/NMOS) and the higher current/voltage requirements of lamps, relays, printer hammers or other similar loads for a broad range of computer, industrial, and consumer applications. All devices feature open–collector outputs and free wheeling clamp diodes for transient suppression.

Features

1. TTL, DTL, PMOS, or CMOS-Compatible Inputs
2. Output Current to 500 mA
3. Output Voltage to 50 V