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ULN2803ADWR Texas Instruments
ULN2803ADWR Texas Instruments
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Darlington Transistors
Manufacturer Texas Instruments

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ULN2803ADWR Texas Instruments

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Specifications

Part Number ULN2803ADWR
Manufacturer Texas Instruments
Series ULN2803A Series
Product Category Analog
Product Type Darlington Transistor Array
Package Type SOIC-18
Number of Channels 8
Input Voltage (V_IN) 2.4V to 5V (TTL compatible)
Output Voltage (V_OUT) Up to 50V
Output Current (I_OUT) 500mA per channel
Input Current (I_IN) 1.35mA (typical)
Gain (h_FE) 1000 (typical)
Power Dissipation (P_D) 1W (max)
Thermal Resistance (θJA) 65°C/W (typical)
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +150°C
Pin Count 18
Lead Finish Matte Tin
RoHS Compliant Yes
Input Logic Compatibility TTL
Output Type Open collector
Built-in Flyback Diodes Yes
Typical Rise Time 100ns (typical)
Typical Fall Time 100ns (typical)
Maximum Collector-Emitter Voltage (V_CE) 50V
Maximum Collector Current (I_C) 500mA per channel
Maximum Emitter Current (I_E) 500mA per channel
Typical Input Voltage for Logic High (V_IH) 2.4V (min)
Typical Input Voltage for Logic Low (V_IL) 0.8V (max)
Typical Output Saturation Voltage (V_CE(sat)) 1.2V (max)
Typical Input Capacitance (C_IN) 10pF (typical)

 

About

The ULN2803ADWR is a versatile and robust Darlington transistor array manufactured by Texas Instruments, designed to facilitate the control of high-voltage and high-current loads. This device features eight Darlington pairs, making it ideal for applications that require the switching of inductive loads such as relays, motors, and lamps. The ULN2803ADWR operates with TTL-compatible input signals, allowing for seamless integration with various digital logic circuits. Its compact SOIC-18 package ensures that it can be easily incorporated into space-constrained designs.

One of the standout features of the ULN2803ADWR is its ability to handle output voltages of up to 50V and output currents of 500mA per channel. This capability makes it suitable for driving a wide range of devices, from small relays to larger inductive loads. The built-in flyback diodes provide essential protection against voltage spikes that can occur when switching inductive loads, enhancing the reliability and longevity of the circuit. This feature is particularly important in applications where inductive kickback can damage components.

The ULN2803ADWR is designed to operate within a wide temperature range of -40°C to +85°C, making it suitable for various environmental conditions. Its thermal resistance of 65°C/W (typical) ensures efficient heat dissipation, which is crucial for maintaining performance during extended operation. The device also boasts a high current gain (h_FE) of approximately 1000, allowing for effective amplification of input signals, which is essential for controlling larger loads with minimal input power.

In summary, the ULN2803ADWR is an excellent choice for engineers and designers looking for a reliable and efficient solution for driving high-current and high-voltage loads. Its combination of high performance, built-in protection features, and compact design makes it suitable for a wide array of applications, including relay drivers, motor controllers, and general-purpose switching tasks. For detailed specifications and application guidelines, users are encouraged to refer to the official Texas Instruments datasheet, which provides comprehensive information on the device’s capabilities and usage.

 

Key Features

  1. High Voltage and Current Handling:
    • Capable of driving loads with output voltages up to 50V and output currents of 500mA per channel, making it suitable for a wide range of applications, including relays, motors, and lamps.
  2. Eight Darlington Pairs:
    • The device contains eight independent Darlington pairs, allowing for multiple load control from a single package, which simplifies circuit design and reduces component count.
  3. TTL Compatible Inputs:
    • Designed to interface directly with TTL logic levels, the ULN2803ADWR can accept input signals from standard digital circuits, making it easy to integrate into existing systems.
  4. Built-in Flyback Diodes:
    • Each output channel includes built-in flyback diodes that protect against voltage spikes generated when switching inductive loads, ensuring the longevity and reliability of the circuit.
  5. Compact SOIC-18 Package:
    • The small outline integrated circuit (SOIC-18) package allows for space-efficient designs, making it ideal for applications where board space is limited.
  6. Wide Operating Temperature Range:
    • The device operates effectively in a temperature range of -40°C to +85°C, making it suitable for use in various environmental conditions.
  7. High Current Gain:
    • With a typical current gain (h_FE) of around 1000, the ULN2803ADWR can amplify low input signals to control larger loads efficiently, minimizing the required input power.
  8. Low Input Current Requirement:
    • The typical input current is approximately 1.35mA, allowing for low-power control of high-current loads.
  9. Power Dissipation Capability:
    • The device can handle a maximum power dissipation of 1W, ensuring it can operate effectively without overheating in typical applications.
  10. RoHS Compliant:
    • The ULN2803ADWR is compliant with RoHS standards, making it an environmentally friendly choice for modern electronic designs.

 

Applications

  1. Relay Drivers:
    • The ULN2803ADWR is commonly used to drive electromagnetic relays. Its ability to handle high output currents makes it ideal for switching applications where relays are used to control larger loads.
  2. Motor Drivers:
    • This device can be employed in motor control circuits, allowing for the operation of DC motors and stepper motors. Its high current capacity enables it to drive motors directly, making it suitable for robotics and automation applications.
  3. Lamp Drivers:
    • The ULN2803ADWR can be used to control incandescent and LED lamps. Its ability to switch high currents makes it effective for lighting applications, including automotive and architectural lighting.
  4. LED Drivers:
    • The transistor array is also suitable for driving multiple LEDs in parallel, allowing for complex lighting designs and effects in various electronic projects.
  5. General-Purpose Switching:
    • The ULN2803ADWR can be utilized in a variety of general-purpose switching applications, where it can control various types of loads, including solenoids, fans, and other inductive devices.
  6. Industrial Automation:
    • In industrial settings, the ULN2803ADWR is often used in control systems for machinery and equipment, providing reliable switching capabilities for actuators and sensors.
  7. Home Automation Systems:
    • The device can be integrated into home automation systems to control appliances, lights, and other devices, allowing for remote or automated operation.
  8. Signal Conditioning:
    • The ULN2803ADWR can be used in signal conditioning applications where it amplifies low-level signals to drive larger loads, ensuring effective signal transmission in various electronic systems.
  9. Test Equipment:
    • It is also used in test and measurement equipment to control various test loads, providing a reliable means of switching during testing procedures.
  10. Consumer Electronics:
    • The ULN2803ADWR can be found in consumer electronics applications, where it is used to control motors, lights, and other components in devices such as toys, appliances, and gadgets.

These applications highlight the ULN2803ADWR’s versatility and effectiveness in a wide range of electronic and electrical systems, making it a popular choice among engineers and designers.

 

Advantages

  1. High Current and Voltage Capability:
    • The ULN2803ADWR can handle output currents of up to 500mA per channel and voltages up to 50V. This capability allows it to drive a wide range of loads, including relays, motors, and lamps, making it suitable for diverse applications.
  2. Integrated Flyback Diodes:
    • Each output channel includes built-in flyback diodes that protect against voltage spikes generated when switching inductive loads. This feature enhances the reliability of the circuit and reduces the need for additional components, simplifying the design.
  3. TTL Compatibility:
    • The device is designed to work with TTL logic levels, allowing for easy interfacing with microcontrollers and other digital logic devices. This compatibility simplifies integration into existing systems and reduces design complexity.
  4. Compact Package:
    • The SOIC-18 package provides a compact footprint, making it ideal for space-constrained applications. This small size allows for efficient use of PCB real estate, which is particularly beneficial in modern electronic designs.
  5. Wide Operating Temperature Range:
    • With an operating temperature range of -40°C to +85°C, the ULN2803ADWR is suitable for use in various environmental conditions, including industrial and automotive applications where temperature fluctuations may occur.
  6. High Current Gain:
    • The device features a high current gain (h_FE) of approximately 1000, allowing for effective amplification of input signals. This means that low input currents can control larger output currents, improving overall efficiency.
  7. Low Input Current Requirement:
    • The typical input current is around 1.35mA, which helps minimize power consumption in control circuits. This low input requirement is advantageous in battery-powered and energy-efficient applications.
  8. Thermal Management:
    • The ULN2803ADWR has a thermal resistance of 65°C/W (typical), ensuring efficient heat dissipation during operation. This feature is crucial for maintaining performance and reliability, especially in high-power applications.
  9. RoHS Compliance:
    • The device is RoHS compliant, ensuring that it meets environmental regulations regarding hazardous substances. This compliance is important for manufacturers looking to produce environmentally friendly products.
  10. Versatile Applications:
    • The ULN2803ADWR is suitable for a wide range of applications, including relay drivers, motor controllers, lamp drivers, and general-purpose switching tasks. Its versatility makes it a valuable component in many electronic designs.
  11. Ease of Use:
    • The ULN2803ADWR is designed for straightforward implementation in circuit designs. Its pin configuration and functionality allow engineers to easily integrate it into existing systems without extensive modifications.
  12. Multiple Channels:
    • With eight independent Darlington pairs in a single package, the ULN2803ADWR allows for the simultaneous control of multiple loads. This feature reduces the need for multiple discrete components, simplifying the design and reducing overall system complexity.
  13. Cost-Effective Solution:
    • By combining multiple functions into a single package, the ULN2803ADWR can reduce component costs and assembly time. This cost-effectiveness is particularly beneficial for high-volume production applications.
  14. Robust Performance:
    • The ULN2803ADWR is designed to provide reliable performance under various operating conditions. Its robust construction and built-in protection features contribute to its longevity and dependability in demanding applications.
  15. Low Output Saturation Voltage:
    • The device typically exhibits a low output saturation voltage (V_CE(sat)), which minimizes power loss during operation. This characteristic enhances overall efficiency, especially in battery-powered and energy-sensitive applications.
  16. Signal Isolation:
    • The open-collector output configuration allows for easy signal isolation between the control circuit and the load. This feature is particularly useful in applications where the control logic needs to be separated from the high-power load.
  17. Flexibility in Load Types:
    • The ULN2803ADWR can drive various types of loads, including resistive, inductive, and capacitive loads. This flexibility makes it suitable for a wide range of applications across different industries.
  18. Application in Safety Systems:
    • The ULN2803ADWR can be used in safety-critical applications, such as emergency lighting and alarm systems, where reliable switching of high-power devices is essential for safety and functionality.
  19. Prototyping and Development:
    • The availability of the ULN2803ADWR in development kits and evaluation modules makes it an excellent choice for prototyping and testing new designs. Engineers can quickly assess its performance in various applications before finalizing their designs.
  20. Community and Support:
    • As a widely used component, the ULN2803ADWR benefits from a large community of users and extensive documentation. This support network can be invaluable for troubleshooting and optimizing designs.

 

Comparison with Similar Components

Feature/Specification ULN2803ADWR ULN2003A TC4427
Manufacturer Texas Instruments Texas Instruments Microchip Technology
Type Darlington Transistor Array Darlington Transistor Array MOSFET Driver
Number of Channels 8 7 2
Output Voltage (V_OUT) Up to 50V Up to 50V Up to 18V
Output Current (I_OUT) 500mA per channel 500mA per channel 2A per channel
Input Voltage (V_IN) 2.4V to 5V (TTL compatible) 2.4V to 5V (TTL compatible) 3V to 15V
Input Current (I_IN) 1.35mA (typical) 1.35mA (typical) 1.5mA (typical)
Operating Temperature Range -40°C to +85°C -40°C to +70°C -40°C to +125°C
Package Type SOIC-18 DIP-16 SOIC-8
Built-in Flyback Diodes Yes Yes No
Typical Rise/Fall Time 100ns (typical) 100ns (typical) 20ns (typical)
RoHS Compliant Yes Yes Yes
Applications Relay drivers, motor drivers, LED drivers Relay drivers, motor drivers, general-purpose switching High-speed switching applications

Key Differences

  1. Number of Channels:
    • The ULN2803ADWR has 8 channels, while the ULN2003A has 7 channels. The TC4427 has only 2 channels, making the ULN2803ADWR more suitable for applications requiring multiple outputs.
  2. Output Current:
    • The ULN2803ADWR and ULN2003A can handle up to 500mA per channel, while the TC4427 can drive up to 2A per channel, making it more suitable for high-current applications.
  3. Output Voltage:
    • All three components can handle output voltages up to 50V (ULN2803ADWR and ULN2003A), but the TC4427 is limited to 18V, which may restrict its use in high-voltage applications.
  4. Input Voltage Range:
    • The ULN2803ADWR and ULN2003A are TTL compatible, operating between 2.4V to 5V. The TC4427 has a wider input voltage range of 3V to 15V, allowing for more flexibility in interfacing with different logic levels.
  5. Built-in Flyback Diodes:
    • Both the ULN2803ADWR and ULN2003A include built-in flyback diodes, which protect against voltage spikes when driving inductive loads. The TC4427 does not have this feature, making it less suitable for inductive load applications without additional protection.
  6. Operating Temperature Range:
    • The ULN2803ADWR operates in a wider temperature range (-40°C to +85°C) compared to the ULN2003A (-40°C to +70°C). The TC4427 has the widest range (-40°C to +125°C), making it suitable for more extreme environments.
  7. Typical Rise/Fall Time:
    • The ULN2803ADWR and ULN2003A have similar rise and fall times (around 100ns), while the TC4427 has a much faster switching time (20ns), making it more suitable for high-speed applications.

Conclusion

The ULN2803ADWR is an excellent choice for applications requiring multiple high-current outputs, such as relay and motor driving, due to its built-in protection features and TTL compatibility. The ULN2003A is similar but offers one less channel. The TC4427, while capable of handling higher currents and faster switching speeds, lacks built-in flyback diodes, making it less suitable for inductive loads without additional components. The choice between these components will depend on the specific requirements of the application, including current, voltage, speed, and protection needs.

 

Frequently Asked Questions ( FAQs )

  1. What is the ULN2803ADWR?
    • The ULN2803ADWR is a Darlington transistor array that contains eight independent Darlington pairs. It is designed for driving high-voltage and high-current loads, making it suitable for applications such as relay drivers, motor controllers, and general-purpose switching.
  2. What is the maximum output voltage and current for the ULN2803ADWR?
    • The ULN2803ADWR can handle output voltages up to 50V and output currents of up to 500mA per channel.
  3. Is the ULN2803ADWR compatible with TTL logic levels?
    • Yes, the ULN2803ADWR is designed to be TTL compatible, allowing it to interface directly with TTL logic circuits and microcontrollers.
  4. What type of package does the ULN2803ADWR come in?
    • The ULN2803ADWR is available in a compact SOIC-18 (Small Outline Integrated Circuit) package, which is suitable for space-constrained applications.
  5. Does the ULN2803ADWR have built-in protection features?
    • Yes, the ULN2803ADWR includes built-in flyback diodes for each output channel, which protect against voltage spikes generated when switching inductive loads.
  6. What is the operating temperature range for the ULN2803ADWR?
    • The ULN2803ADWR operates effectively within a temperature range of -40°C to +85°C, making it suitable for various environmental conditions.
  7. Can the ULN2803ADWR be used to drive motors?
    • Yes, the ULN2803ADWR is commonly used to drive DC motors and stepper motors due to its high current handling capability.
  8. What is the typical input current required for the ULN2803ADWR?
    • The typical input current for the ULN2803ADWR is approximately 1.35mA, which helps minimize power consumption in control circuits.
  9. Is the ULN2803ADWR RoHS compliant?
    • Yes, the ULN2803ADWR is RoHS compliant, ensuring that it meets environmental regulations regarding hazardous substances.
  10. Where can I find the datasheet for the ULN2803ADWR?
    • The datasheet for the ULN2803ADWR can be found on the Texas Instruments website or through authorized distributors. The datasheet provides detailed specifications, electrical characteristics, and application guidelines.
  11. What types of loads can the ULN2803ADWR drive?
    • The ULN2803ADWR can drive various types of loads, including resistive, inductive (such as relays and motors), and capacitive loads, making it versatile for many applications.
  12. Can I use the ULN2803ADWR in battery-powered applications?
    • Yes, the ULN2803ADWR is suitable for battery-powered applications due to its low input current requirement and efficient operation.
  13. How do I connect the ULN2803ADWR in my circuit?
    • The ULN2803ADWR can be connected by applying TTL-compatible input signals to the input pins and connecting the loads to the output pins. The built-in flyback diodes will handle inductive kickback automatically.
  14. What is the significance of the open-collector output configuration?
    • The open-collector output configuration allows for easy signal isolation between the control circuit and the load, enabling multiple outputs to be tied together for wired-AND logic configurations.
  15. What are some common applications for the ULN2803ADWR?
    • Common applications include relay drivers, motor drivers, lamp drivers, LED drivers, and general-purpose switching tasks in industrial automation and consumer electronics.
  16. What is the gain (h_FE) of the ULN2803ADWR?
    • The ULN2803ADWR typically has a current gain (h_FE) of around 1000, which allows for effective amplification of input signals, enabling control of larger loads with minimal input power.
  17. Can the ULN2803ADWR be used for PWM (Pulse Width Modulation) applications?
    • Yes, the ULN2803ADWR can be used in PWM applications to control the speed of motors or the brightness of LEDs by varying the duty cycle of the input signal.
  18. What is the typical output saturation voltage (V_CE(sat)) for the ULN2803ADWR?
    • The typical output saturation voltage (V_CE(sat)) is around 1.2V (maximum), which indicates the voltage drop across the output when it is in the “on” state.
  19. How does the ULN2803ADWR handle thermal management?
    • The ULN2803ADWR has a thermal resistance of 65°C/W (typical), which helps in dissipating heat generated during operation. Proper thermal management is essential for maintaining performance and reliability, especially in high-power applications.
  20. What is the input voltage range for the ULN2803ADWR?
    • The input voltage (V_IN) for the ULN2803ADWR is typically between 2.4V to 5V, making it compatible with standard TTL logic levels.
  21. Can I use the ULN2803ADWR to drive multiple loads simultaneously?
    • Yes, the ULN2803ADWR can drive multiple loads simultaneously, as it contains eight independent channels. This feature allows for efficient control of several devices from a single package.
  22. What precautions should I take when using the ULN2803ADWR?
    • When using the ULN2803ADWR, ensure that the total current drawn from all output channels does not exceed the maximum ratings. Additionally, consider proper heat dissipation methods, such as using heat sinks if necessary.
  23. Is there a recommended way to test the ULN2803ADWR in a circuit?
    • To test the ULN2803ADWR, connect the input pins to a TTL-compatible signal source and connect the output pins to the loads. Measure the output voltage and current to ensure they are within specified limits.
  24. What is the significance of the open-collector output configuration?
    • The open-collector output allows for multiple outputs to be connected together in a wired-AND configuration, enabling logic functions and simplifying circuit designs where multiple devices need to be controlled by a single signal.
  25. Where can I find support or community resources for the ULN2803ADWR?
    • Support and community resources can be found on the Texas Instruments website, including forums, application notes, and user guides. Additionally, many electronics communities and forums provide discussions and troubleshooting tips related to the ULN2803ADWR.
  26. Can the ULN2803ADWR be used in automotive applications?
    • Yes, the ULN2803ADWR is suitable for automotive applications due to its wide operating temperature range and robust performance, making it ideal for controlling various automotive loads.
  27. What is the typical input capacitance (C_IN) for the ULN2803ADWR?
    • The typical input capacitance (C_IN) for the ULN2803ADWR is around 10pF, which is important for understanding the input signal characteristics and ensuring proper signal integrity.
  28. How does the ULN2803ADWR compare to other transistor arrays?
    • The ULN2803ADWR is specifically designed for high-voltage and high-current applications, with built-in protection features like flyback diodes. It is often compared to other transistor arrays based on parameters such as current handling, voltage ratings, and package type.
  29. What are the limitations of the ULN2803ADWR?
    • While the ULN2803ADWR is versatile, it has limitations such as a maximum output current of 500mA per channel and a maximum collector-emitter voltage of 50V. Users should ensure that their applications stay within these limits.
  30. Can I use the ULN2803ADWR for high-frequency switching applications?
    • The ULN2803ADWR is not optimized for high-frequency switching applications due to its rise and fall times. It is best suited for applications where switching speeds are not critical.

 

Datasheet

ULN2803ADWR Texas Instruments Datasheet

 

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