ULN2003A Applications

Drive several relay coils from logic. Match coil voltage, pickup requirements and current to the complete driver design.

Sequence the coil channels and connect the winding common to the load supply. This is a low-side array, not a bipolar H-bridge.

Switch lamps or suitably current-limited LED loads. Account for startup current and the Darlington voltage drop.

Find ULN2003A in the Components Library to place its schematic symbol and connect its pins.