ULN2804APG Darlington Transistor Array
The ULN2804APG Darlington Transistor Array is a highly reliable and versatile device, designed for interfacing low-level digital logic circuits (such as TTL, CMOS, or PMOS/NMOS) with high-current, high-voltage loads such as lamps, relays, and printer hammers. Featuring eight NPN Darlington transistors, it offers efficient control for a wide range of industrial, consumer, and computer applications. The ULN2804APG incorporates open-collector outputs and free-wheeling clamp diodes, ensuring protection against transient voltages and enhancing durability.
Specifications:
ULN2804 Pin Configuration:
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | 1B | Input Pin1B |
| 2 | 2B | Input Pin 2B |
| 3 | 3B | Input Pin 3B |
| 4 | 4B | Input Pin 4B |
| 5 | 5B | Input Pin 5B |
| 6 | 6B | Input Pin 6B |
| 7 | 7B | Input Pin 7B |
| 8 | 8B | Input Pin 8B |
| 9 | GND | Ground Pin |
| 10 | COM | Common Pin |
| 11 | 8C | Output Pin 8C |
| 12 | 7C | Output Pin 7C |
| 13 | 6C | Output Pin 6C |
| 14 | 5C | Output Pin 5C |
| 15 | 4C | Output Pin 4C |
| 16 | 3C | Output Pin 3C |
| 17 | 2C | Output Pin 2C |
| 18 | 1C | Output Pin 1C |
The ULN2803 is designed to be compatible with standard TTL families while the ULN2804 is optimized for 6 to 15-volt high-level CMOS or PMOS.
Applications:
- Used in industrial control systems to interface with relays, motors, and solenoids.
- Perfect for consumer electronics requiring high-voltage switching.
- Commonly used in printer mechanisms for controlling hammers or other actuators.
- Ideal for use in automotive circuits for controlling lights, fans, and other components.
- Applicable in automation systems requiring efficient power switching.
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