ULN2004AD

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:	ULN2004A

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Introduction:The ULN2004AD is a common integrated circuit (IC) used in many electronic circuits. It is a universal array of darlington transistors, each capable of switching up to 500mA, with a maximum peak current of 1.2A. The device itself is made up of seven high-voltage, high-current darlington transistors arrayed in the ULN2004AD integrated circuit package. This device is often used in applications such as motor control, relay control, dimming of lights and motors, and in many industrial control systems. In this article, we will discuss the ULN2004AD application field and working principle, so as to better understand how this IC works and what it is used for.Application Field:The ULN2004AD is a versatile electronic device, capable of providing up to 1.2A of peak current and 500mA of continuous current. As such, it is suitable for a wide range of applications, including motor control, relay control, dimming of lights and motors, and in many industrial control systems. This device is particularly suited for use in hobby and other low-voltage applications, as it is relatively small in size and cost-effective. In addition, it can be used to drive multiple loads at once, making it especially useful in applications where multiple switches are needed. Working Principle:The ULN2004AD is made up of seven individual high-voltage, high-current darlington transistors. This particular configuration helps make the ULN2004AD an ideal choice for a wide range of applications, as it can provide a high-current output with a relatively low voltage input. Each transistor is capable of switch up to 500mA of continuous current, and can handle a maximum peak current of 1.2A.Each of the seven transistors consists of two darlington transistors connected in a series/parallel configuration. When a voltage is applied to the input of the ULN2004AD, it is multiplied by two pairs of darlington transistors. This multiplication effect increases the current output of the device and allows it to provide up to 1.2A of peak current when needed.In addition to its high current output, the ULN2004AD also has low on-resistance, which makes it suitable for electronics with high switching frequency and low on-resistance loads. This feature enables the device to switch rapidly between high and low states.Conclusion:The ULN2004AD is a versatile and cost-effective IC that can be used in a variety of applications. It is an excellent choice for applications requiring high current output and low on-resistance, such as motor control, dimming of lights and motors, and many industrial control systems. The ULN2004AD is made up of seven high-voltage, high-current darlington transistors, which provides a high-current output with a relatively low voltage input. Understanding the working principle of the ULN2004AD will help you to better understand how the device works and how it can be used in various applications.

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