**Technical Datasheet for ULN2803ADWR - High-Voltage, High-Current Darlington Transistor Array**
**I. Introduction**
The ULN2803ADWR is a high-performance Darlington transistor array designed to provide high-voltage, high-current outputs from low-level logic signals. Incorporating eight Darlington-paired NPN transistors, this device is ideal for applications requiring signal amplification and interface control between low-voltage logic circuits and higher-voltage, higher-current loads. The ULN2803ADWR features a robust design that is well-suited for industrial, automotive, and consumer electronics applications.
**II. Key Features**
- **High Voltage and Current Capability**: Capable of driving loads up to 500mA per channel and withstanding collector-to-emitter voltages up to 50V, making it suitable for a wide range of output devices.
- **Darlington Configuration**: Each channel incorporates a Darlington pair configuration, providing high current gain and saturation voltage, allowing for reliable switching of inductive loads.
- **Integrated Clamp Diodes**: Internal clamp diodes protect each output transistor from transient voltage spikes caused by inductive loads, improving reliability and extending device lifetime.
- **Low Saturation Voltage**: Low saturation voltage (VCE(sat)) allows for efficient power dissipation, reducing heat generation and enabling higher current driving capability.
- **Common Collector Outputs**: Outputs are configured as common collector (emitter-follower), allowing for easy interface with TTL or CMOS logic circuits.
- **Short-Circuit Protection**: The device is designed with built-in thermal shutdown protection, which activates when internal junction temperatures exceed safe operating limits, protecting the device against damage from short circuits or overloads.
**III. Electrical Specifications**
- **Collector-Emitter Voltage (VCEO)**: 50V
- **Collector Current (IC)**: 500mA per channel (continuous), 1.5A peak (any one output)
- **Saturation Voltage (VCE(sat))**: Typically less than 1.2V at 350mA and 16V VCE
- **Input Voltage Range**: Compatible with TTL and CMOS logic levels (VIH min = 2V, VIL max = 0.8V)
- **Propagation Delay Time (tpd)**: Typically specified in the datasheet, depending on operating conditions
- **Operating Temperature Range**: -40°C to +85°C
**IV. Applications**
- **Motor Control**: Ideal for driving relays, solenoids, DC motors, and stepper motors in automotive, industrial, and robotic systems.
- **LED Lighting Control**: Can be used to drive high-power LEDs, providing precise current control and protection against thermal runaway.
- **Signal Amplification**: Increases the drive capability of low-level logic signals to interface with high-voltage, high-current loads.
- **Interface Control**: Used in industrial automation, security systems, and various other electronic devices requiring signal amplification and isolation.
**V. Package Information**
- **Package Type**: DIP-18 (Dual In-line Package with 18 pins)
- **Lead Finish**: May vary based on manufacturer, typically available in tin-lead or RoHS-compliant finishes.
- **Dimensions**: Standard DIP-18 package dimensions ensure compatibility with industry-standard PCB footprints.
**VI. Conclusion**
The ULN2803ADWR Darlington transistor array provides a robust, high-performance solution for driving high-voltage, high-current loads from low-level logic signals. Its high current gain, low saturation voltage, and integrated protection features make it an excellent choice for a wide range of industrial, automotive, and consumer electronics applications. With its common collector outputs and wide operating temperature range, the ULN2803ADWR offers designers a flexible and reliable solution for interface control and signal amplification tasks.
