ULN2003ADE4

Series:	--
Packaging:	Tube
Part Status:	Active
Transistor Type:	7 NPN Darlington
Current - Collector (Ic) (Max):	500mA
Voltage - Collector Emitter Breakdown (Max):	50V
Vce Saturation (Max) @ Ib, Ic:	1.6V @ 500µA, 350mA
Current - Collector Cutoff (Max):	50µA
DC Current Gain (hFE) (Min) @ Ic, Vce:	--
Power - Max:	--
Frequency - Transition:	--
Operating Temperature:	-20°C ~ 70°C (TA)
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	ULN2003A

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Introduction

ULN2003ADE4 is a family of high voltage, high current Darlington array integrated circuits. It is designed to interchangeably source or sink up to 500mA of current from a single output. With a wide range of input and output voltages, it is suitable for many common switching and amplification applications. This article will discuss the application field and working principle of the ULN2003ADE4 array.

Application Field

The ULN2003ADE4 is used in a variety of applications, such as:

• Motor control - The ULN2003ADE4 is frequently used as an amplifier for small DC motors in applications such as model trains, robotic arms, hobbyist projects, and HVAC components.
• Lighting - The ULN2003ADE4 can be used to create lighting displays with LEDs. It can also be used to create dimming effects by controlling the current to the LEDs.
• High current switching - The ULN2003ADE4 is capable of switching up to 500mA of current, making it useful in a wide variety of automotive, industrial, and consumer applications.
• Signal conditioning - The ULN2003ADE4 is commonly used to condition various signal types such as logic or digital signals, analog signals, or industrial signals.
• Stepper motor control - The ULN2003ADE4 can be used to drive stepper motors, which are used in a wide variety of applications such as robotics, factory automation, and printer mechanisms.

Working Principle

The ULN2003ADE4 is a Darlington array integrated circuit. It contains eight Darlington pairs, each consisting of a bipolar NPN transistor connected to a bipolar PNP transistor.When input is applied to one of the Darlington pairs, the current traveling through the base-emitter junction of the NPN transistor lowers the voltage on the collector and the base of the PNP transistor, thus allowing current to flow from the collector to the emitter of the PNP transistor, thus allowing the current to reach the output of the ULN2003ADE4.The ULN2003ADE4 is most commonly used as an amplifier, allowing for low-current logic-level signals to be amplified for higher-voltage and -current applications. It can also be used as a switch, allowing for higher-voltage signals to be switched between one or more outputs. In both cases, the ULN2003ADE4 has the advantage of being able to sink and source current, making it useful in a wide variety of circuit designs.

Conclusion

The ULN2003ADE4 is a versatile high voltage, high current device that can be used in a variety of applications. It is most frequently used as an amplifier, allowing for low-current logic-level signals to be amplified for higher-voltage and -current applications. It can also be used as a switch, allowing for higher-voltage signals to be switched between one or more outputs. With its wide range of input and output voltages, the ULN2003ADE4 is suitable for many common switching and amplification applications.

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