ULN2803

ULN2803 is a single-chip integrated high voltage, high current Darlington transistor array, which contains eight independent Darlington transistor driving circuits internally. The circuit is internally designed with a continuous current diode, which can be used to drive inductive loads such as relays and stepper motors. A single Darlington tube collector can output a current of 500mA. Parallel connection of Darlington tubes can achieve higher output current capacity. This circuit can be widely used for relay drive, lighting drive, display screen drive (LED), stepper motor drive, and logic buffer. Each Darlington transistor of ULN2803A is connected in series with a 2.7K base resistor, which can be directly connected to TTL/CMOS circuits at a working voltage of 5V, and can directly process data that originally required standard logic buffers for processing.

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