Overview
The ULN2803AN, produced by Texas Instruments, is a high-voltage, high-current Darlington transistor array. This device is part of the ULN2803 series and is specifically packaged in a PDIP (N) package. It consists of eight NPN Darlington pairs, each capable of handling high-voltage outputs up to 50V and collector currents up to 500mA. The ULN2803AN is designed for versatility and reliability, making it suitable for a wide range of applications that require high current drive capabilities.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Collector-Emitter Voltage | 50 | V |
| Collector Current (Single Output) | 500 | mA |
| Input Compatibility | TTL, 5V CMOS, 3.3V CMOS | |
| Series Base Resistor | 2.7 kΩ | |
| Output Clamp Diodes | Common-cathode clamp diodes | |
| Operating Temperature Range | -40°C to 85°C | |
| Propagation Delay Time (Low to High) | 130 ns | |
| Propagation Delay Time (High to Low) | 20 ns |
Key Features
- High-voltage outputs up to 50V
- High-current capability up to 500mA per Darlington pair
- Output clamp diodes for inductive load protection
- Inputs compatible with TTL, 5V CMOS, and 3.3V CMOS logic
- Series base resistor (2.7 kΩ) for direct operation with logic devices
- Ability to connect Darlington pairs in parallel for higher current capability
Applications
- Relay drivers
- Hammer drivers
- 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-emitter voltage of the ULN2803AN?
The maximum collector-emitter voltage is 50V.
- What is the maximum collector current per Darlington pair?
The maximum collector current per Darlington pair is 500mA.
- What types of logic are the inputs compatible with?
The inputs are compatible with TTL, 5V CMOS, and 3.3V CMOS logic.
- What is the purpose of the output clamp diodes?
The output clamp diodes are used to suppress the kickback voltage from inductive loads.
- Can the Darlington pairs be connected in parallel for higher current capability?
Yes, the Darlington pairs can be connected in parallel to achieve higher current capability.
- What is the operating temperature range of the ULN2803AN?
The operating temperature range is -40°C to 85°C.
- What are some common applications of the ULN2803AN?
Common applications include relay drivers, lamp drivers, display drivers, and stepper motor driving.
- How do the series base resistors facilitate operation with logic devices?
The series base resistors (2.7 kΩ) allow the ULN2803AN to operate directly with TTL or CMOS devices.
- What is the propagation delay time for low to high output?
The propagation delay time for low to high output is 130 ns.
- What is the propagation delay time for high to low output?
The propagation delay time for high to low output is 20 ns.
