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ULN2803ADWR

8-ch Darlington driver, 500mA/ch, SOIC-18

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Manufacturer Part：

ULN2803ADWR

Package：

SOIC-18 (11.5 x 7.5 mm, 1.27mm pitch)

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Description

Product Overview

The ULN2803ADWR from Texas Instruments is an 8-channel Darlington transistor array with 500mA per channel and built-in clamp diodes in an 18-pin SOIC package. The DW denotes SOIC-18, R denotes tape and reel. Designed for 5V TTL/CMOS interface, it drives relays, solenoids, stepper motors, and lamps directly from logic-level inputs.

Key Specifications

Channels 8 Darlington pairs
Output Current 500mA per channel
VCE(sat) 1.1V typical @ IC=350mA
hFE 1000 min @ IC=350mA
Input Compatible 5V TTL/CMOS
Clamp Diodes Yes (all 8 channels)
Input Resistor 2.7kOhm (series base resistor)
Operating Voltage Up to 50V (output)
Operating Temp -40 to +85 C
Package SOIC-18 (wide, 1.27mm pitch)

Features

  • 8-channel Darlington driver array
  • 500mA per channel with 1A peak
  • Built-in clamp diodes for inductive loads
  • 2.7kOhm input resistors for 5V logic interface
  • 50V output voltage capability
  • 1.1V low saturation voltage at 350mA

Applications

  • Relay and solenoid drivers
  • Stepper motor driving
  • Lamp and LED displays
  • High-voltage logic interface

The ULN2803ADWR from Texas Instruments is an 8-channel Darlington transistor array with 500mA per channel and built-in clamp diodes in an 18-pin SOIC package. The DW denotes SOIC-18, R denotes tape and reel. Designed for 5V TTL/CMOS interface, it drives relays, solenoids, stepper motors, and lamps directly from logic-level inputs.

The ULN2803ADWR operates as described in the product overview. Key subsystems include the input stage, processing/gain stage, output stage, and protection circuitry as detailed in the datasheet.

Pin Name Type Description
1-8 IN1-IN8 Input Logic inputs (5V TTL/CMOS)
9 GND Power Ground
10-17 OUT8-OUT1 Output Darlington outputs (open-collector)
18 COM Output Clamp diode common (connect to supply)
  • Relay and solenoid drivers
  • Stepper motor driving
  • Lamp and LED displays
  • High-voltage logic interface
Model Manufacturer Package Notes
ULN2803AN TI DIP-18 Through-hole version
TBD62083AFWG Toshiba SSOP-18 DMOS, lower VCEsat
MC1413DG onsemi SOIC-16 7-channel version
ULN2003ADWR TI SOIC-16 7-channel version
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