ULN2803ADWR Transistor: Features, Applications and Datasheet

ULN2803ADWR

Product Overview

Part Number: ULN2803ADWR

Manufacturer: Texas Instruments

Description: Darlington Transistor Arrays in SOIC-18-300 mils with ROHS compliance

Lead Time: Can Ship Immediately

Datasheet: Datasheet PDF

Category: Triode/MOS Tube/Transistor/Darlington Transistor Arrays

Number of Lines: 18

Short Description

The ULN2803ADWR consists of seven pairs of NPN Darlington transistors that operate at high voltages and currents. The outputs of each unit are open collectors with a common emitter. Suppression diodes are included with these units to maximize their effectiveness with inductive loads. For each Darlington pair, the ULN2803A has a series base resistor, enabling TTL or CMOS operation at 5.0 V or 3.3 V. Solenoid, relay, lamp, motor, and LED interfaces are supported by the ULN2803ADWR. If the sink current required by the application exceeds the capability of a single output, paralleling the outputs can be used to address the problem.

About Texas Instruments

A publicly traded company, Texas Instruments manufactures and designs semiconductors and computer technology products. Dallas, Texas, is the company's headquarters. It was founded in 1930. In addition to producing integrated circuits and embedded processors, TI also manufactures microcontrollers and digital signal processing chips. There is a wide range of industries that the company serves, including automobile, communications, computing, industrial, and consumer electronics. Aside from data converters, microcontrollers, sensors, and amplifiers, TI also develops amplifiers, comparators, and amplifiers.

Product Specifications

Darlington transistor array ULN2803ADWR from Texas Instruments offers high voltage and high current. The ULN2803ADWR has the following specifications:

Categories	Discrete Semiconductor Products
Manufacturer	Texas Instruments
Packaging	Reel - TR
Status	Active
Transistor Polarity	8 NPN Darlington
Maximum Current Collector	500mA
VCEO Maximum Collector-Emitter Breakdown Voltage	50V
Max Vce (sat)	1.6V @ 500μA, 350mA
Temperature Range - Operating	-40°C to 85°C (TA)
Mounting	SMD (SMT)
Case / Package	18-SOIC
Win Source Part Number	035966-ULN2803ADWR
Family Name	ULN2803A
Introduction Date	February 01, 2006
ECCN	EAR99
Country of Origin	Philippines, Thailand
Halogen Free	Compliant
Estimated EOL Date	2027
Is this a common-used part?	Yes
Popularity	High
Fake Threat In the Open Market	71 pct.
Supply and Demand Status	Sufficient
Application Field	Used in Audio, Signal Processing, Industrial, Power Management
Alternative Parts (Cross-Reference)	ULN2803AFW(M); ULN2804AFW(5,EL,M)ULN2803AFW(5,EL,M);

Design

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Functional Block Diagram

Features

In ADCs, Texas Instruments produces ULN2803ADWR, a high-voltage and high-current Darlington transistor array. A relay, solenoid, stepper motor, and LED display can all be driven efficiently by this device. The ULN2803ADWR has the following features:

Darlington Configuration:

ULN2803ADWR's Darlington transistor pairs provide high current gain and are capable of switching high loads efficiently. It is possible to create Darlington pairs via cascading several bipolar transistors, which provide low saturation voltages and high current gains.

High Current Handling:

In industrial and automotive applications, the ULN2803ADWR can drive a wide range of high-current loads with its Darlington pairs, each capable of 500mA continuous output.

High Voltage Capability:

This device is able to withstand maximum collector-base voltages (VCE) of 50V, so it can be used in a variety of industrial and automotive systems that typically operate at a variety of voltage levels.

Clamping Diodes:

A clamping diode (flyback diode) is installed on each output channel of the ULN2803ADWR. A diode provides a path for the reverse current when a load, such as a relay coil or solenoid, is turned off, which prevents voltage spikes from occurring.

Common-Cathode Clamp Diodes:

A common-cathode clamp diode is included in the ULN2803ADWR along with individual clamping diodes. By reducing the number of external components required for inductive load protection, these diodes provide a centralized ground reference for the external load.

Input Compatibility:

There are three logic families supported by the ULN2803ADWR inputs: TTL (Transistor-Transistor Logic), CMOS (Complementary Metal-Oxide Semiconductor), and PMOS (Pseudo-MOS). Microcontrollers, logic gates, and digital signal sources can all be connected to the chips, which makes them compatible with a wide range of electronic components.

Operating Temperature Range:

A wide temperature range makes the ULN2803ADWR suitable for various industrial and automotive applications. It operates between -20°C and +70°C.

Built-in Overtemperature Protection:

Overtemperature protection is built into the ULN2803ADWR to protect it from thermal damage under extreme conditions. As a result of this feature, the IC's reliability and long-term durability are greatly enhanced.

ULN2803ADWR Transistor Applications

There are many applications where ULN2803ADWR transistor arrays are required to switch high current and high voltage, especially when driving inductive loads. The ULN2803ADWR can be used for the following applications:

Relay Driving:

The ULN2803ADWR is mainly used to drive electromagnetic relays. Switching high-current loads is a common purpose of relays in industrial automation, automobiles, and control circuits. By amplifying current and protecting against back electromotive forces (EMFs) generated by relay coils, the ULN2803ADWR provides the necessary current amplification.

Solenoid Control:

Door locks, valves, and actuators all use solenoids, which are electromechanical devices. A voltage spike generated during deactivation of a solenoid is protected against by the ULN2803ADWR by providing the necessary current amplification.

Motor Control:

Motor control applications use the ULN2803ADWR to operate stepper motors, DC motors, and other types of motors. By switching the flow of current through the motor windings, it can control the direction and speed of the motor. Motor coil voltage spikes are also prevented by clamping diodes during switching of transistor arrays.

LED Display Driving:

The illumination of multiple LEDs simultaneously is often a requirement of LED matrix displays and alphanumeric displays. Through individual current sourcing for each LED segment, the ULN2803ADWR is capable of driving LED displays efficiently. LED displays continue to operate reliably despite high currents and voltage spikes thanks to its capability to handle such conditions.

Printer Mechanisms:

Among the electromechanical components used in printers and other imaging devices are stepper motors, solenoids, and actuators that facilitate the handling of paper, the movement of print heads, and the control of ink cartridges. These components are driven reliably and efficiently using the ULN2803ADWR in printer mechanisms.

Industrial Automation:

Valve, actuator, pump, and other electromechanical devices are controlled by ULN2803ADWR in industrial automation systems. High currents and voltages are handled well by the unit, as well as the built-in protection features that make it suitable for harsh industrial settings.

Automotive Applications:

The drive window control system, the door lock actuator, the wiper control, and the lighting system are all examples of automotive applications. Automobile manufacturers use the ULN2803ADWR in applications like these and others. A robust design and the ability to handle high voltages make it suitable for automotive environments.

Audio Amplifier Output Stages:

ULN2803ADWR driver stages are often used to amplify and control output signals in audio amplifier circuits. Designed to handle high currents, it is reliable in audio applications due to its protection features.

Power Supply Sequencing:

Circuits for controlling the sequencing and timing of power supply rails require high-current switches. Switching power supply rails efficiently and reliably can be achieved by utilizing the ULN2803ADWR in power supply sequencing circuits.

Robotics:

A number of actuators, motors, and sensors are controlled by the ULN2803ADWR in robotics applications. In both industrial and hobbyist robotics projects, it is suitable for controlling robotic mechanisms thanks to its ability to drive high-current loads and withstand voltage spikes.

Comparison Component

Part Number	ULN2803ADWR	ULQ2003ATDRQ1	ULN2004AD	ULN2004ADR	MCP23S08-E/SO
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Microchip Technology
Package / Case	18-SOIC (0.295, 7.50mm Width)	16-SOIC (0.154, 3.90mm Width)	16-SOIC (0.154, 3.90mm Width)	16-SOIC (0.154, 3.90mm Width)	18-SOIC (0.295, 7.50mm Width)
Number of Pins	18	16	16	16	18
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
REACH SVHC	No SVHC	No SVHC	No SVHC	No SVHC	No SVHC
Lead Free	Lead Free	Lead Free	Lead Free	Lead Free	Lead Free
Terminal Position	DUAL	DUAL	DUAL	DUAL	DUAL
Pbfree Code	yes	yes	yes	yes	yes

Faqs

Question 1: Does the ULN2803ADWR have overtemperature protection?

Answer: The ULN2803ADWR provides thermal protection against overheating under extreme operating conditions. ICs with this feature are more reliable and longer lasting in demanding environments.

Question 2: Can ULN2803ADWR be used to sequence power supplies?

Answer: It is possible to switch power supply rails reliably and efficiently using the ULN2803ADWR in power supply sequencing circuits. Power supply rail timing and sequence can be controlled using its built-in protection features and high-current handling capabilities.

Question 3: How does ULN2803ADWR protect against voltage spikes in inductive loads?

Answer: There are flyback diodes (clamping diodes) built into each output channel on ULN2803ADWR, which prevent reverse current from flowing when an inductive load is turned off. As a result, inductive loads do not cause voltage spikes on the transistor array.

Final Verdict

This device is well suited to drive inductive loads such as relays, solenoids, motors, and LED displays thanks to the fact that it can handle high-current loads (up to 500mA per channel) and high voltages (up to 50V). Inductive loads generate voltage spikes, so the clamping diodes on this component ensure reliable operation and prolong component life.

With its performance, reliability, and ease of integration, the ULN2803ADWR can control printer mechanisms, power automotive accessories, and drive industrial actuators across a variety of industries. Incorporating it into existing designs and PCB layouts is easy thanks to its compact SOIC package.

With ULN2803ADWR transistor arrays, robust and reliable electronic systems can be designed with reliable drivers that can drive inductive loads. Engineers looking for high-performance solutions for their design challenges prefer it for its versatility, protection features, and wide range of applications.