ULN2803ADWR: Overview,parameter,Main uses,Features,application fields,working principle and alternative models

The ULN2803ADWR is an integrated circuit (IC) commonly used for driving high-current loads such as relays, stepper motors, and other inductive loads. Here is an overview of the ULN2803ADWR including its parameters, main uses, features, application fields, working principle, and some alternative models:



  • Manufacturer: Texas Instruments
  • Part Number: ULN2803ADWR
  • IC Type: Darlington Transistor Array
  • Package: SOIC-18
  • Number of Channels: 8
  • Max Output Current per Channel: 500 mA
  • Voltage Rating: Typically around 50V
  • DataSheet ULN2803ADWR PDF


  • Max Output Current: 500 mA per channel
  • Voltage Rating: Typically around 50V
  • Input Logic Compatibility: TTL, CMOS

Main Uses:

  • Driving Inductive Loads: It is commonly used to drive inductive loads like motors, solenoids, and relays.
  • Switching High-Current Loads: This IC can handle higher currents than typical logic level outputs.


  • Darlington Pair Configuration: Each channel typically consists of a Darlington pair, providing high current gain and allowing it to drive high-power loads.
  • Built-in Clamp Diodes: To protect against back EMF generated by inductive loads.
  • Open Collector Outputs: Requires an external power supply for the loads being driven.

Application Fields:

  • Industrial Automation: Used in control systems for driving actuators, pumps, and various electromechanical components.
  • Instrumentation: In equipment where there is a need to control high-current peripherals.
  • Robotics: Driving motors and other high-current components in robotic systems.

Working Principle:

  • The ULN2803ADWR acts as a buffer between a low-power control signal (typically from a microcontroller or digital logic circuit) and a high-power load.
  • When the input signal is applied, the corresponding output of the ULN2803ADWR turns on, allowing current to flow through the load.
  • The Darlington pair configuration provides sufficient current amplification to drive the load effectively.

Alternative Models:

  • ULN2003A: Similar to the ULN2803A but with fewer output channels (7 channels).
  • ULN2804A: Another member of the ULN series commonly used for similar purposes, offering 7 channels but with higher voltage ratings.
  • MC1413: A comparable Darlington transistor array IC suitable for driving high-current loads.

These components are commonly used in digital electronics and automation where there is a need to control high-current loads reliably. Make sure to refer to the manufacturer's datasheets for detailed specifications, pin configurations, and application notes when working with these devices.

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