Overview
The ULN2803AN, produced by Texas Instruments, is a high-voltage, high-current Darlington transistor array. This device consists of eight NPN Darlington pairs, each capable of handling up to 500 mA of collector current and withstanding output voltages of up to 50 V. The ULN2803AN is designed to interface directly with various logic families, including TTL and CMOS, making it versatile for a wide range of applications. It features integral suppression diodes for inductive loads, which are crucial for driving motors, solenoids, and relays. The device is packaged in an 18-lead plastic DIP, simplifying board layout with its input-opposite-output pinout.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Collector Current (single output) | 500 | mA |
| Output Voltage | 50 | V |
| Input Resistor | 2.7 kΩ | |
| Operating Ambient Temperature Range | -20 to 85 | °C |
| Storage Temperature Range | -55 to 150 | °C |
| Junction Temperature | -20 to 150 | °C |
| Thermal Resistance (junction-ambient) | 55 | °C/W |
| Collector-Emitter Saturation Voltage | 0.9 - 1.6 | V |
| Input Current | 0.93 - 1.35 | mA |
Key Features
- Eight NPN Darlington transistor pairs with common emitters and integral suppression diodes for inductive loads.
- High-voltage outputs up to 50 V and high-current capability up to 500 mA per channel.
- Inputs compatible with various logic families, including TTL and CMOS.
- Outputs can be paralleled for higher current capability.
- Series base resistor (2.7 kΩ) for each Darlington pair, allowing direct operation with 5 V TTL or CMOS devices.
- Convenient input-opposite-output pinout to simplify board layout.
Applications
- Relay drivers, hammer drivers, and lamp drivers.
- Display drivers (LED and gas discharge).
- Line drivers and logic buffers.
- Factory automation and control.
- Building automation.
- Appliances.
- IP network camera.
- HVAC valve and actuator control.
- Stepper motor driving.
Q & A
- What is the maximum collector current per channel of the ULN2803AN?
The maximum collector current per channel is 500 mA.
- What is the maximum output voltage the ULN2803AN can handle?
The maximum output voltage is 50 V.
- What type of logic families is the ULN2803AN compatible with?
The ULN2803AN is compatible with TTL and CMOS logic families.
- Can the outputs of the ULN2803AN be paralleled for higher current capability?
Yes, the outputs can be paralleled for higher current capability.
- What is the purpose of the integral suppression diodes in the ULN2803AN?
The integral suppression diodes are used to suppress the kickback voltage from inductive loads.
- What is the operating ambient temperature range of the ULN2803AN?
The operating ambient temperature range is -20 to 85 °C.
- What is the thermal resistance (junction-ambient) of the ULN2803AN?
The thermal resistance (junction-ambient) is 55 °C/W.
- What is the collector-emitter saturation voltage of the ULN2803AN?
The collector-emitter saturation voltage ranges from 0.9 to 1.6 V.
- Can the ULN2803AN be used to drive stepper motors?
Yes, the ULN2803AN can be used to drive stepper motors.
- What is the package type of the ULN2803AN?
The ULN2803AN is packaged in an 18-lead plastic DIP.
