STMicroelectronics ULQ2803A Octal High Voltage Transistor Array

The ULQ2803A 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 robust and versatile component is an ideal solution for driving a wide range of loads such as relays, solenoids, stepping motors, LED displays, filament lamps, and high-power buffers.

The ULQ2803A consists of eight NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of a single Darlington pair is 500 mA, and the entire array is capable of handling a total current of 2.5 A when all pairs are in use. Each pair is rated for a minimum breakdown voltage of 50 V, making the ULQ2803A suitable for many high voltage applications.

With its TTL/CMOS/PMOS/DTL compatible inputs, the ULQ2803A can be directly connected to microcontrollers and logic devices, simplifying the circuit design and minimizing the need for additional interfacing components. The device's input pins are pinned opposite the output pins to facilitate the layout and simplify the connection of input drivers and the load.

Key features of the ULQ2803A include:

• Output current (single output): 500 mA
• High-voltage outputs: 50 V
• Input compatible with various types of logic: TTL, CMOS, PMOS, DTL
• Relay driver applications
• Integral suppression diodes
• Output clamp diodes
• Inputs pinned opposite outputs to simplify board layout

This integrated circuit is provided in a 18-pin plastic DIP (Dual In-line Package) making it easy to handle and integrate into a wide variety of electronic projects and commercial devices. The ULQ2803A is a reliable and cost-effective solution for designers looking to drive multiple high-voltage and high-current loads with a single integrated device.

Whether you're designing an automated system, developing a prototype, or creating a custom circuit for a specialized application, the ULQ2803A from STMicroelectronics offers the performance and reliability needed to efficiently control your power loads.