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ULN2804A

Name: ULN2804A
Rating: 4.7 (12 reviews)

POWER BIPOLAR TRANSISTOR, NPN

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製造商。部分 #ULN2804A
包 DIP-18
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規格

Package	Tube
ProductStatus	Obsolete
TransistorType	8 NPN Darlington
Current-Collector(Ic)(Max)	500mA
Voltage-CollectorEmitterBreakdown(Max)	50V
VceSaturation(Max)@IbIc	1.6V @ 500µA, 350mA
DCCurrentGain(hFE)(Min)@IcVce	1000 @ 350mA, 2V
Power-Max	2.25W
OperatingTemperature	-20°C ~ 150°C (TJ)
MountingType	Through Hole
Package/Case	18-DIP (0.300, 7.62mm)

概述

Description

The ULN2804A is a high-voltage, high-current Darlington transistor array designed for driving loads such as relays, lamps, and stepper motors. It consists of eight NPN Darlington pairs, providing individual output channels that can sink up to 500 mA each with a maximum voltage rating of 50V. This device integrates protective diodes to handle inductive loads, preventing back EMF from damaging the transistors.
The ULN2804A is commonly used in applications requiring control of multiple devices with a microcontroller or logic circuits, simplifying circuit design by reducing the number of discrete components needed. It features a common emitter configuration and is typically used with a pull-up resistor in the output stage. The device operates efficiently with low input current requirements, making it suitable for interfacing between low-power digital logic and higher power loads. Its compact 18-pin DIP or surface-mount package enables easy integration into various electronic systems.

Features

The ULN2804A is an octal (8-channel) Darlington transistor array designed for driving loads such as relays, lamps, and motors. Key features include:
1. Wide Voltage Range: Operates with supply voltages from 5V to 50V.
2. High Current Capability: Each channel can handle up to 500mA of output current.
3. High Voltage Rating: Supports output voltages up to 50V.
4. Built-in Flyback Diodes: Integrated protection diodes for inductive loads, providing safe operation when switching.
5. Single-Ended Input: Compatible with TTL and CMOS logic levels for easy interfacing.
6. Thermal Protection: Enhanced reliability with thermal shutdown features.
7. Compact Package Options: Available in DIP-16 and other package types for versatility in design.
These features make the ULN2804A a popular choice for applications requiring control of high-power devices from low-power digital logic signals.

Package

The ULN2804A is typically packaged in a 16-pin DIP (Dual In-line Package) or a 20-pin surface mount package (such as TSSOP). These packages facilitate easy integration into circuits for driving loads like relays and motors.

Pinout

The ULN2804A is a high-voltage, high-current Darlington transistor array with an 18-pin dual in-line package (DIP). It features eight open-collector outputs which can be used for driving inductive loads such as relays, motors, and lamps.
### Pin Count:
- Total Pins: 18
### Pin Functions:
1. Inputs (1-8): Pins 1, 2, 3, 4, 5, 6, 7, and 8 are the input pins that receive control signals.
2. Outputs (9-16): Pins 9, 10, 11, 12, 13, 14, 15, and 16 are the open-collector outputs connected to the loads.
3. Common Ground (17): Pin 17 is connected to the ground.
4. Common Emitter (18): Pin 18 is used for connecting the emitters of the output transistors to ground.
The ULN2804A can handle high current up to 500 mA per channel and can control voltages up to 50V. Its integrated clamp diodes protect against back EMF, making it suitable for driving inductive loads.

Manufacturer

The ULN2804A is manufactured by multiple companies, but it is primarily associated with Texas Instruments (TI). Texas Instruments is a global semiconductor company that designs and manufactures a wide range of electronic components, including analog, embedded processing, and digital signal processing devices. The company serves diverse sectors such as automotive, industrial, communications, and consumer electronics. Founded in 1930, TI is known for its innovation in analog and embedded processing technology, making it a major player in the semiconductor industry.

Application

The ULN2804A is a high-voltage, high-current Darlington transistor array commonly used in applications such as relay driving, motor control, solenoid activation, and LED control. Its multiple channels make it suitable for interfacing with microcontrollers and digital logic, allowing for switching of inductive loads and high-power devices. Additionally, it is used in automation systems, robotics, and other electronic projects requiring reliable control of various output devices.

Equivalent

The ULN2804A is equivalent to the ULN2803A and ULN2802A. These chips are part of the ULN2xxx series of Darlington transistor arrays and serve similar purposes in driving loads. The ULN2003A and ULN2004A are also related, but have different pin configurations and current ratings. Always verify specifications before substitution.