Overview
The ULN2803ADWRG4, produced by Texas Instruments, is a Darlington transistor array that consists of eight NPN Darlington pairs. This device is designed to handle high-voltage outputs and is compatible with various logic types, including TTL and 5-V CMOS devices. Each Darlington pair features a high current gain, making it suitable for driving high-current loads such as relays, lamps, and small motors. The device includes output clamp diodes for switching inductive loads, enhancing its reliability and versatility in various applications.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Darlington Pairs | 8 |
| Output Voltage | Up to 50 V |
| Collector Current per Pair | 500 mA |
| Input Compatibility | TTL, 5-V CMOS |
| Series Base Resistor | 2.7 kΩ |
| Package Types | SOIC (18-pin), PDIP (18-pin) |
| Body Size (SOIC) | 11.50 mm × 7.50 mm |
| Body Size (PDIP) | 22.48 mm × 6.35 mm |
Key Features
- High-voltage outputs up to 50 V
- High current gain due to Darlington configuration
- Output clamp diodes for inductive load switching
- Compatible with TTL and 5-V CMOS logic
- Series base resistor for direct operation with logic devices
- Ability to parallel outputs for higher current capability
Applications
- Relay drivers
- Hammer drivers
- Lamp drivers (LED and gas discharge)
- Display drivers
- Line drivers
- Logic buffers
- Solenoids and small motors
Q & A
- What is the ULN2803ADWRG4 used for?
The ULN2803ADWRG4 is used for driving high-current loads such as relays, lamps, and small motors. - What is the maximum output voltage of the ULN2803ADWRG4?
The maximum output voltage is up to 50 V. - What is the collector current rating per Darlington pair?
The collector current rating per Darlington pair is 500 mA. - Is the ULN2803ADWRG4 compatible with TTL and CMOS logic?
Yes, it is compatible with TTL and 5-V CMOS logic. - What is the purpose of the series base resistor in the ULN2803ADWRG4?
The series base resistor allows for direct operation with TTL or CMOS devices. - Can the outputs of the ULN2803ADWRG4 be paralleled for higher current?
Yes, the outputs can be paralleled to achieve higher current capability. - What types of loads can the ULN2803ADWRG4 drive?
The device can drive relays, lamps, small motors, and other high-current loads. - What is the significance of the output clamp diodes in the ULN2803ADWRG4?
The output clamp diodes are used for switching inductive loads, protecting the device from back-EMF. - What are the package options for the ULN2803ADWRG4?
The device is available in SOIC (18-pin) and PDIP (18-pin) packages. - What is the recommended maximum junction temperature for the ULN2803ADWRG4?
The recommended maximum junction temperature is less than 125°C.
