ULN2803A

Description

The ULN2803A is a bipolar junction transistor (BJT) array from STMicroelectronics, featuring eight NPN Darlington transistors with common emitters. This component is designed for high-current applications, capable of handling up to 500 mA of output current and 50 V of output voltage. The integral suppression diodes provide protection against inductive kickback. The ULN2803A is available in a through-hole PDIP-18 package, making it suitable for breadboarding or prototyping. Its compact design and high-current capabilities make it an attractive solution for various applications, including robotics, automation, and industrial control systems. In summary, the ULN2803A is a versatile BJT array that offers high current handling, protection against inductive kickback, and a compact package, making it an excellent choice for designers seeking to drive high-current loads.

Features

The ULN2803A features:

• Eight Darlington transistors with common emitters
• Output current up to 500 mA
• Output voltage up to 50 V
• Integral suppression diodes
• Versions for all popular logic families
• Outputs can be paralleled
• Inputs pinned opposite outputs to simplify board layout

Package

The package type of ULN2803A is PDIP-18 (Plastic Dual In-Line Package, 18 pins).

Pinout

The ULN2803A has a pin count of 18 (PDIP-18 package). The functions of each pin are:

• Pins 1-8: Collector outputs
• Pin 9: VCC (positive supply voltage)
• Pin 10: GND (ground)
• Pins 11-17: Input pins

The ULN2803A is a bipolar transistor array with eight NPN Darlington transistors, each with a common emitter. The output current can reach up to 500 mA and the output voltage can reach up to 50 V.

Manufacturer

The manufacturer of the ULN2803A is STMicroelectronics, a multinational semiconductor company that designs, develops, and manufactures a wide range of semiconductor products, including microcontrollers, memory devices, logic ICs, and more.

Applications

The ULN2803A is a versatile component that can be used in various applications, including:

• Latching relays
• Solenoids
• LED drivers
• Actuators
• Motor control
• Audio equipment
• Industrial automation

These are typical application areas where the transistors' high current and voltage capabilities, along with their Darlington configuration, can be utilized effectively.