ULN2004ANSR Discrete Semiconductor Products

Series:	--
Packaging:	Tape & Reel (TR)
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 (0.209", 5.30mm Width)
Supplier Device Package:	16-SO
Base Part Number:	ULN2004A

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ULN2004ANSR is a chip of transistor array that combines three functions in a single package. It consists of two Darlington arrays (ULN2004A) and a Schmitt Trigger circuit (ULN2004N). These were created in order to achieve a one-chip solution for various motion control, protection, and drive requirements. This article will cover the application field and the working principle of this chip.

Application Field

The ULN2004ANSR is designed to address three vital needs in motion control, protection, and drive applications. Firstly, it can drive inductive loads, such as relays and solenoids. Secondly, it provides an over-current protection system, helping to ensure the safety of the system. Finally, it offers a Schmitt Trigger circuit, which is a feature unique to this chip and allows it to work with inputs that may have varying levels of logic high and logic low. This makes it well suited to interfacing with complex and uncertain environments.Due to its performance characteristics and low cost, the ULN2004ANSR has become a standard choice in many sectors, such as automotive, medical, industrial automation, and scientific instrumentation. It is an ideal choice in situations where signals must be processed and distributed between devices within a system.

Working Principle

The ULN2004ANSR is an eight-channel Darlington array. Each of the eight channels consists of two Darlington transistors connected in a single package.When the ULN2004ANSR receives a logic high level signal from the “input” side on any of its eight channels, the first transistor (T1) turns on. This passing through the current released by T2, whose collector-emitter area is bigger than T1’s, is increased significantly. This allows the load, which is connected to the “output” side, to be driven in a strong and reliable fashion.The Schmitt Trigger circuit is used to make sure that each channel’s logic low level is consistent, regardless of the exact logic high level. This is achieved by using two cascaded transistors. When the input logic high drops below the logic low voltage threshold, transistor T1 is turned off and a current path is formed between T2 and the load. This in turn causes the output voltage to drop.In addition, the ULN2004ANSR has implemented a series of protection features. These are designed to not only protect the chip from overheating and overloads, but also to limit the current that can reach the output. This provides a safe and reliable operation of the system.In summary, the ULN2004ANSR is an eight-channel transistor array that integrates three features: inductive load driving, over-current protection, and Schmitt Trigger circuit. It is a powerful and cost-effective solution for motion control, protection, and driving applications.

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