The ULN2803A is a popular high-voltage, high-current Darlington transistor array manufactured by STMicroelectronics. Here is a detailed introduction to the ULN2803A:
1. Overview:
- Manufacturer: STMicroelectronics
- Part Number: ULN2803A
- Type: 8-Channel NPN Darlington Transistor Array
- Package: 18-pin DIP (Dual Inline Package)
2. Key Specifications:
- Transistor Type: NPN Darlington Array
- Voltage Rating: 50V (Maximum Collector-Emitter Voltage)
- Current Rating: 500mA (Continuous Collector Current per Channel)
- Number of Channels: 8
- Package Type: 18-pin DIP package
- Output Clamp Diodes for Inductive Load Driving: Includes built-in protection diodes for inductive loads
-
DataSheet
3. Features and Applications:
- Darlington Array: Integrated array of NPN Darlington transistors for high-current switching applications.
- Voltage and Current Ratings: Designed for driving inductive or resistive loads at up to 50V and 500mA per channel.
- Package Type: 18-pin DIP package for through-hole mounting on PCBs.
- Built-in Diodes: Output clamp diodes provide protection for driving inductive loads.
- Input/Output Common Pins: Simplifies interfacing with microcontrollers and other control devices.
4. Package Information:
- DIP Package: Through-hole package suitable for mounting on standard PCBs.
5. Applications:
- Stepper Motor Drivers: Used to control stepper motors in various applications.
- Relay Drivers: Driving relays and solenoids in industrial and automation systems.
- Lamp and LED Drivers: Controlling lamps and LEDs in lighting systems.
- Motor Controls: Providing control for DC motors and other high-current devices.
- Driver for Displays: Driving segments in LED displays and other display types.
6. Advantages:
- High Current Capability: Each channel can handle up to 500mA of continuous current.
- Multiple Channels: 8 NPN Darlington pairs in one package for driving multiple loads.
- Built-in Protection Diodes: Integrated diodes for protecting against back EMF from inductive loads.
- Interfacing Ease: Common input and output pins simplify control signal connections.
The ULN2803A from STMicroelectronics is a versatile 8-channel NPN Darlington transistor array designed for driving high-current loads such as relays, solenoids, stepper motors, and other inductive or resistive loads. With its high voltage and current ratings, built-in protection diodes, and multiple channels in a convenient DIP package, the ULN2803A is a popular choice for various industrial, automotive, and consumer electronic applications requiring reliable and efficient high-power switching capabilities.
