The ULN2004 from STMicroelectronics is a versatile and robust integrated circuit that features a high-voltage, high-current Darlington transistor array. This device is specifically designed to interface between low-level logic circuitry and multiple peripheral power loads typically found in drivers for relays, lamps, LED displays, stepper motors, and other high-current or high-voltage applications.

Key Features

• Seven Darlingtons per package: The ULN2004 includes seven independent Darlington pairs that can handle a continuous current of 500 mA per channel.
• Output voltage: It can sustain a high output voltage of up to 50V, making it suitable for a variety of high-voltage applications.
• Input compatibility: The inputs are pinned opposite the outputs to simplify the board layout. They are compatible with popular logic types such as TTL, 5V CMOS, and PMOS.
• Integrated suppression diodes: Each channel includes an integrated suppression diode for inductive loads, which is essential for managing transient voltage spikes and protecting the device and the load.

Applications

The ULN2004 is ideal for use in a wide range of applications including:

• Relay drivers
• Stepper and DC brushed motor drivers
• Lamp drivers
• LED and gas discharge display drivers
• Line drivers
• Logic buffers

Reliability and Performance

STMicroelectronics ensures that the ULN2004 meets high standards of quality and performance. Its robust design allows it to handle significant power and voltage levels while maintaining operational stability. The device's package is designed for optimal heat dissipation, ensuring reliable performance even under high-current driving conditions.

Package Options and Availability

The ULN2004 is available in a standard 16-pin DIP (Dual In-line Package) or SO (Small Outline) package, providing flexibility for various PCB designs and space requirements. It is widely available through STMicroelectronics' distribution channels and is supported by comprehensive technical documentation.