Overview
The ULN2803ANG4, produced by Texas Instruments, is a 50V, 500mA Darlington transistor array. This device consists of eight NPN Darlington pairs, each featuring high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The ULN2803ANG4 is designed to be compatible with standard TTL and 5V CMOS logic families, making it versatile for a wide range of applications. It includes a 2.7kΩ series base resistor for each Darlington pair, allowing direct operation with TTL or CMOS logic at supply voltages of 5V or 3.3V. This component is widely used in various industrial, consumer, and automation applications due to its high current capability and transient suppression features.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (VO) | 50 | V |
| Input Voltage (VI) | 30 | V |
| Continuous Collector Current (IC) | 500 | mA |
| Continuous Base Current (IB) | 25 | mA |
| Operating Ambient Temperature Range (TA) | -20 to 85 | °C |
| Storage Temperature Range (TSTG) | -55 to 150 | °C |
| Junction Temperature (TJ) | -20 to 150 | °C |
| Thermal Resistance Junction-Ambient (RthJA) | 55 | °C/W |
Key Features
- Eight NPN Darlington transistor pairs with common emitters and integral suppression diodes for inductive loads.
- Output current rating of 500 mA per channel (600 mA peak).
- Output voltage rating of 50 V.
- Inputs compatible with TTL and 5V CMOS logic families.
- 2.7kΩ series base resistor for each Darlington pair.
- Outputs can be paralleled for higher current capability.
- Free-wheeling clamp diodes for transient suppression.
Applications
- Factory automation and control.
- Building automation.
- Appliances.
- IP network cameras.
- HVAC valve and actuator control.
- Relay, solenoid, and lamp driving.
- Stepper motor driving.
- Driving inductive loads such as motors, solenoids, and relays.
- Display drivers (LED and gas discharge).
- Line drivers and logic buffers.
Q & A
- What is the output voltage rating of the ULN2803ANG4?
The output voltage rating is 50 V.
- What is the continuous collector current rating per channel?
The continuous collector current rating is 500 mA per channel.
- Is the ULN2803ANG4 compatible with TTL and CMOS logic?
Yes, it is compatible with standard TTL and 5V CMOS logic families.
- What is the purpose of the integral suppression diodes?
The integral suppression diodes are used to suppress the kickback voltage from inductive loads.
- Can the outputs of the ULN2803ANG4 be paralleled for higher current capability?
Yes, the outputs can be paralleled for higher current capability.
- What is the operating ambient temperature range of the ULN2803ANG4?
The operating ambient temperature range is -20 to 85 °C.
- What is the thermal resistance junction-ambient (RthJA) of the ULN2803ANG4?
The thermal resistance junction-ambient (RthJA) is 55 °C/W.
- What types of loads can the ULN2803ANG4 drive?
The ULN2803ANG4 can drive inductive loads such as motors, solenoids, and relays, as well as other loads like lamps and small motors.
- How many Darlington transistor pairs does the ULN2803ANG4 contain?
The ULN2803ANG4 contains eight NPN Darlington transistor pairs.
- What is the storage temperature range of the ULN2803ANG4?
The storage temperature range is -55 to 150 °C.
