The ULN2804A, manufactured by STMicroelectronics, is a high-voltage, high-current Darlington transistor array. This integrated circuit is designed to interface between low-level logic circuits and multiple peripheral power loads. The ULN2804A is particularly well-suited for driving inductive loads such as relays, solenoids, stepping motors, and other high-current/high-voltage loads in a variety of industrial and consumer applications.
Key Features
- Eight Darlington Transistors: The array contains eight NPN Darlington pairs that can handle high current loads.
- Output Current: Each channel is capable of sourcing up to 500 mA of current, making it suitable for driving a wide range of loads.
- High Voltage Outputs: It can handle output voltages up to 50 V, providing flexibility for various types of loads.
- Input-Compatible with Popular Logic Types: Inputs are compatible with a variety of logic levels, including TTL, 5V CMOS, and PMOS.
- Suppression Diodes: Integrated suppression diodes provide protection for inductive loads and ensure safe operation when driving relays or motors.
- Output Clamp Diodes: Outputs are clamped with diodes to the ground to protect the device from transient voltage spikes.
Applications
The ULN2804A is versatile and can be used in numerous applications, such as:
- Relay drivers
- Stepper motor drivers
- LED displays / LED matrix drivers
- Logic buffers
- Line drivers
- Alarm systems
Package and Quality
The ULN2804A comes in a standard 18-pin DIP (Dual In-line Package) or a 20-pin SO (Small Outline) package, making it easy to integrate into a wide range of electronic circuits. STMicroelectronics ensures high-quality standards, with the device being rigorously tested for performance and reliability across different conditions and applications.
For detailed specifications, application notes, and additional resources, designers and engineers are encouraged to consult the official datasheet and product documentation available on the STMicroelectronics website.
