ULN2071B Darlington Array from STMicroelectronics

The ULN2071B from STMicroelectronics is a high-voltage, high-current Darlington transistor array designed to interface between low-level logic circuitry and multiple peripheral power loads. This integrated circuit is particularly suitable for applications that require the direct driving of loads by digital logic signals, such as relays, solenoids, stepping motors, LED and incandescent displays, filament lamps, and thermal print heads.

Key Features

• Seven Darlington Arrays: The ULN2071B consists of seven NPN Darlington pairs, each capable of driving a wide range of high-power outputs with high efficiency.
• High-Voltage Outputs: With output voltage ratings of 50V, this IC can comfortably handle the requirements of most medium to high-voltage applications.
• High-Current Handling: Each channel is capable of sourcing up to 500mA, making it suitable for driving a variety of high-current loads.
• Output Clamp Diodes: Inputs and outputs are equipped with clamp diodes for transient suppression, protecting the device and the load during inductive switching.
• Wide Operating Temperature Range: The device is designed to operate within a temperature range of -20°C to 85°C, ensuring reliability across diverse environmental conditions.
• Direct Interface with TTL and CMOS: Logic levels of the ULN2071B are compatible with TTL and CMOS, allowing for direct connection with microcontrollers and other logic devices without the need for level shifting.

Applications

The ULN2071B is versatile and can be used in a wide array of applications, including:

• Driver for solenoids, relays, and stepper motors
• Buffer for LED and incandescent displays
• Switch for filament lamps and thermal print heads
• Line drivers for consumer and industrial applications

STMicroelectronics' ULN2071B offers a robust and reliable solution for driving high-power loads directly from logic signals, simplifying circuit design and reducing component count in a variety of electronic systems. Its ease of use, combined with its powerful output capabilities, makes it an essential component for engineers and designers looking to create efficient and durable power interfaces.