ULN2803ADWR
The ULN2803ADWR is a Darlington transistor array manufactured by Texas Instruments, designed for high-current switching applications. It has eight Darlington pairs, each of which can manage output currents of up to 300 mA and 20 mA. The device is flexible for different voltage levels, operating within a voltage supply range of 0V to 50V. Its 18-SOIC package makes it simple to use in circuit designs that call for several high-current outputs.
Description
Product features
- The ULN2803ADWR is an octal high-voltage, high-current Darlington transistor array. Each channel of the ULN2803ADWR comprises Darlington connected NPN transistors, offering a very high current gain (β), which can reach up to 10,000 at certain currents. This allows for high output current drive with very low input current, making it suitable for applications with low GPIO voltages.
Key Specifications:
- Voltage Supply Range: 0V to 50V
- Maximum Output Current: 300mA (high), 20mA (low)
- Maximum Propagation Delay: 130ns at 50V with a 15pF load capacitance
-
- By connecting a 2.7 kΩ resistor between the input and base of the pre-driver Darlington transistor, the GPIO voltage is transformed into base current, which controls the Darlington pairs. Furthermore, each NPN transistor's base and emitter are coupled to 3.0 kΩ and 7.2 kΩ resistors, which serve as pull-downs to reduce input leakage.
- The model is designed to suppress kick-back voltage from inductive loads by means of diodes placed between the output and the COM pin. When the NPN drivers turn off (stop sinking), this stops reverse current flow, which could otherwise harm the circuit.
- During normal operation, the diodes on the base and collector pins are reversed biased. If these diodes become forward biased, internal parasitic NPN transistors may draw current from nearby device pins.
Application
- The ULN2803ADWR is commonly utilized in various applications where it serves as a robust interface between low-power control signals, such as those from microcontrollers (MCUs) or logic devices, and high-current or high-voltage peripherals. Here are some typical applications:
- Relay Drivers:
- It has the ability to drive electromechanical relay coils, which are employed in control and industrial automation systems.
- Hammer Drivers:
- Used in printers and other devices where solenoids or actuators (such as hammers) need to be controlled.
- Lamp Drivers:
- Suitable for driving incandescent lamps or other types of lighting elements.
- Display Drivers (LED and Gas Discharge):
- Can be used to operate gas discharge or LED display panels or segments in a variety of electrical devices.
- Line Drivers:
- It can drive communication lines, ensuring reliable signal transmission over long distances.
- Logic Buffers:
- Provides buffering capability for logic signals, enhancing signal integrity and driving capability.
Product parameter information
| Type | Specification |
|
Product Category |
Darlington Transistors |
|
Manufacturer |
Texas Instruments |
|
Logic Type |
NPN |
|
Number of Circuits |
8 |
|
Number of Inputs |
8 |
|
Voltage - Supply |
0V ~ 50V |
|
Current - Output High, Low |
300mA, 20mA |
|
Max Propagation Delay @ V, Max CL |
130ns @ 50V, 15pF |
|
Operating Temperature |
-40°C ~ 85°C (TA) |
|
Mounting Type |
Surface Mount |
|
Supplier Device Package |
18-SOIC |
|
Package / Case |
18-SOIC (0.295", 7.50mm Width) |
|
Base Product Number |
ULN2803 |
|
Factory Pack Quantity |
2000 |
|
Width |
7.52 mm |
|
Height |
2.35 mm |
|
Length |
11.62 mm |
|
Unit Weight |
0.007408 oz |
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FAQ
Q: What is ULN2803ADWR?
Q: Which characteristics make up the ULN2803ADWR?
Q: What kinds of applications does ULN2803ADWR typically have?
Q: How is the inductive kickback prevented by this circuit?
Q: What is the product's input voltage range?
Q: Can DC motors be driven directly by ULN2803ADWR?
Q: What is the number of channels in ULN2803ADWR?
Q: How much current per channel can the ULN2803ADWR handle at its maximum?
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