ULN2003ADR Texas Instruments

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The ULN2003ADR, a remarkable achievement by Texas Instruments, stands as a cornerstone in the realm of high-voltage, high-current darlington transistor arrays. Designed to seamlessly interface with standard TTL and CMOS levels, this device is a key component in driving a wide range of loads including relays, solenoids, and stepper motors. Its robust design and versatile functionality make it an ideal choice for an array of applications, from home appliances to office machines, and from industrial controls to automotive environments.



The ULN2003ADR is a versatile and reliable Darlington transistor array designed for a wide range of applications. Its features make it particularly suited for driving high-voltage, high-current loads such as relays, solenoids, and stepper motors. Here are some of the key features of the ULN2003ADR:

1. Seven Darlington Pairs:

  • The ULN2003ADR contains seven independent Darlington pairs that can handle high-voltage outputs with high current driving capabilities, allowing it to drive multiple loads simultaneously.

2. High-Voltage Outputs:

  • It is capable of withstanding up to 50V across its outputs, making it suitable for a variety of high-voltage applications.

3. High-Current Drive:

  • Each channel can drive 500 mA, providing sufficient current for a wide range of inductive and resistive loads.

4. Integrated Suppression Diodes:

  • Built-in diodes for inductive load transient suppression are included for each output, offering protection against voltage spikes and reducing the need for external components.

5. TTL/CMOS Compatibility:

  • The input compatible with standard TTL and CMOS logic levels (5V and 3.3V respectively), facilitating easy interfacing with microcontrollers and other digital logic circuits without the need for level shifting.

6. Output Clamp Diodes:

  • Inputs and outputs are equipped with clamp diodes to limit unwanted voltage spikes, enhancing the protection of the device and the overall system.

7. Wide Operating Temperature Range:

  • It operates across a broad temperature range, typically from -40°C to 85°C, making it suitable for use in various environmental conditions.

8. Package Options:

  • The ULN2003ADR is available in a variety of packages, including the standard SOIC, which is suitable for surface mount technology (SMT), providing flexibility in PCB design and assembly.

9. High Reliability:

  • Manufactured by Texas Instruments, the ULN2003ADR is designed to meet high-quality standards, ensuring reliable performance in critical applications.

10. Versatility:

  • Its wide range of applications, from simple LED drivers to complex motor control systems, makes the ULN2003ADR a versatile component for various electronic designs.

These features make the ULN2003ADR an excellent choice for designers and engineers looking for a robust, high-performance solution to drive high-voltage, high-current loads in their applications.



The ULN2003ADR is a versatile and robust integrated circuit known for its ability to drive high-voltage, high-current loads, making it an indispensable component in a wide range of applications. Its design is particularly suited for interfacing with standard TTL and CMOS logic levels, and it includes built-in diodes for inductive load transient suppression. The applications of the ULN2003ADR span across various sectors, including but not limited to:

1. Automotive Applications:

  • Control of Dashboard Indicators: Driving LEDs or lamps for dashboard warning lights and indicators.
  • Automotive Relays: Operating relays that control various functions within vehicles, such as headlight switches or windshield wipers.

2. Industrial Automation:

  • Solenoid/Valve Control: Controlling solenoids in industrial valves, pneumatic or hydraulic control systems, facilitating fluid and air flow control.
  • Motor Control: Driving stepper or servo motors in industrial machinery for precise control of mechanical movement.

3. Consumer Electronics:

  • Home Appliances: Operating motors, relays, and displays in appliances like washing machines, dryers, and dishwashers for user interface and control systems.
  • Gaming Consoles: Driving tactile feedback devices or LED indicators in gaming controllers and consoles.

4. Office and Home Automation:

  • Printer and Scanner Motors: Controlling stepper motors in printers and scanners for paper feed mechanisms and scanning modules.
  • Security Systems: Operating electromechanical locks, alarm systems, and indicator lights.

5. Telecommunication Equipment:

  • Relay Control: Managing relay operations within telecommunications infrastructure for signal routing and control.
  • Equipment Cooling Fans: Controlling fans in telecommunications equipment to maintain optimal operating temperatures.

6. Medical Devices:

  • Medical Instrumentation: Driving motors and indicators in medical devices like centrifuges, pumps, and scanners.
  • Patient Monitoring Systems: Operating alarms, indicators, and relay-based controls in patient monitoring equipment.

7. Robotics and DIY Projects:

  • Robotic Actuators: Controlling motors and actuators in robotic arms, vehicles, and drones.
  • DIY Electronics Projects: Enabling hobbyists and educators to interface with motors, LEDs, and sensors in various experimental and educational projects.

The ULN2003ADR’s ability to interface directly with logic signals and drive inductive loads with high efficiency and protection against voltage spikes makes it a popular choice in these applications. Its reliability and ease of use have solidified its position as a go-to solution for driving a wide range of loads in both commercial and hobbyist projects.



The ULN2003ADR is a high-voltage, high-current Darlington transistor array that offers several advantages for driving a wide range of loads, from LEDs to motors. Here are some of the key benefits of using the ULN2003ADR in your projects or applications:

1. High Voltage and Current Capabilities:

  • The ULN2003ADR can handle up to 500 mA per channel and withstand voltages up to 50V, making it suitable for driving a variety of high-power devices.

2. Integrated Flyback Diodes:

  • Each channel includes a built-in suppression diode for inductive loads, protecting the circuit from voltage spikes that occur when turning off inductive loads like motors and relays. This feature simplifies circuit design and enhances reliability.

3. Compatibility with Logic Levels:

  • The device is designed to be directly interfaced with TTL and CMOS logic levels, allowing for easy integration with microcontrollers, logic boards, and other digital systems without the need for additional level-shifting components.

4. Ease of Use:

  • With its straightforward pin configuration and the simplicity of connecting it to control logic and loads, the ULN2003ADR is user-friendly and accessible to both beginners and experienced engineers.

5. Multiple Channels:

  • The ULN2003ADR contains seven Darlington pairs, allowing it to drive multiple loads simultaneously. This feature is particularly useful for applications requiring the control of several devices, such as multiple relays, motors, or LEDs.

6. Versatility:

  • Its broad range of applications, from automotive and industrial automation to consumer electronics and DIY projects, makes the ULN2003ADR a versatile component that can be used in numerous types of projects.

7. Cost-Effectiveness:

  • The integration of multiple Darlington pairs and built-in suppression diodes in a single package reduces the component count, board space, and overall cost of the system.

8. Thermal Protection:

  • The ULN2003ADR is designed with thermal shutdown mechanisms, ensuring the device is protected from overheating and improving the overall safety and longevity of your application.

9. Reliability:

  • Manufactured by Texas Instruments, a leader in semiconductor solutions, the ULN2003ADR is built to high-quality standards, ensuring dependable performance across a wide range of operating conditions.

10. Industry Standard:

  • The ULN2003 series has been widely used and time-tested in the industry, making it a trusted choice for driving inductive loads. Its popularity also means there’s a wealth of resources and community support available for troubleshooting and project inspiration.

In summary, the ULN2003ADR combines high-voltage and current handling capabilities, integrated protection features, ease of use, and reliability, making it an excellent choice for a wide array of applications. Whether you’re a hobbyist working on a DIY project or an engineer designing a complex system, the ULN2003ADR offers a practical solution for controlling inductive loads.



Product Attribute Attribute Value
Manufacturer: Texas Instruments
Product Category: Darlington Transistors
Configuration: Array 7
Transistor Polarity: NPN
Collector- Emitter Voltage VCEO Max: 50 V
Maximum DC Collector Current: 500 mA
Mounting Style: SMD/SMT
Package / Case: SOIC-Narrow-16
Minimum Operating Temperature: – 20 C
Maximum Operating Temperature: + 70 C
Series: ULN2003A
Packaging: Reel
Packaging: Cut Tape
Brand: Texas Instruments
Height: 1.58 mm
Length: 9.9 mm
Operating Temperature Range: – 20 C to + 70 C
Product Type: Darlington Transistors
Factory Pack Quantity: 2500
Subcategory: Transistors
Width: 3.91 mm
Unit Weight: 0.010582 oz



ULN2003ADR Texas Instruments Datasheet


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