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ULN2803A eight-way Darlington driver chip solution verification board

Overview

ULN2803A is a monolithic integrated high-voltage, high-current Darlington array. The circuit contains eight independent Darlington driver channels. A freewheeling diode is designed inside the circuit, which can be used to drive inductive loads such as relays and stepper motors. A single Darlington collector can output 500mA. Higher output current capabilities can be achieved by connecting Darlingtons in parallel. This circuit can be widely used in relay driving, lighting driving, display driving (LED), stepper motor driving and logic buffer. Each Darlington tube of ULN2803A is connected in series with a 2.7K base resistor, which can be directly connected to the TTL/CMOS circuit under an operating voltage of 5V, and can directly process data that originally required a standard logic buffer.

Design Files

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Update:2025-06-24 01:55:37

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