The UDN5703A is a quad high-current Darlington switch array designed for interfacing low-level logic to high-current loads. It is manufactured by Allegro MicroSystems, LLC and is specifically designed for driving inductive loads such as relays, solenoids, and lamps.

Applications

• Driving relays
• Driving solenoids
• Driving incandescent lamps
• Driving small DC motors
• Logic buffers
• Line drivers

Features

• High output current: 500 mA per driver (single output)
• High breakdown voltage: 50 V
• TTL, DTL, CMOS compatibility
• Inputs pinned opposite outputs to simplify board layout
• Internal suppression diodes for inductive loads

Benefits

• Simplified interface between logic circuits and high-current loads.
• Protection against voltage transients generated by inductive loads due to integrated suppression diodes.
• Reduced component count and board space due to the integration of four drivers in a single package.
• Improved system reliability through robust design and high voltage/current handling capabilities.
• Simplified PCB layout with inputs and outputs pinned on opposite sides.

Technical Specifications

The UDN5703A operates with a supply voltage typically between 4.5V and 5.5V. Each of the four Darlington pairs can switch up to 500mA of current and withstand a breakdown voltage of up to 50V. The input logic is compatible with TTL, DTL, and CMOS logic levels, enabling easy integration with a wide range of microcontrollers and digital circuits. The operating temperature range is typically from -20°C to +85°C. The package is a standard DIP-16 (Dual In-Line Package).