ULN2001A

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:	1000 @ 350mA, 2V
Power - Max:	--
Frequency - Transition:	--
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	16-DIP (0.300", 7.62mm)
Supplier Device Package:	16-DIP
Base Part Number:	ULN2001A

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The ULN2001A is a high-voltage, high-current Darlington transistor array typically used as an interface between a low-current integrated circuit and a higher-current load. Each chip contains eight Darlington transistors and diodes, each capable of providing 500 mA and up to 50 volts of continuous current. As a result, the ULN2001A can be used for a variety of applications, including motor control and power supply control.The ULN2001A consists of two subsystems, each containing four Darlington transistors and four diodes in a 16-pin dual inline package (DIP). Each subsystem consists of a series of common-emitter amplifiers, also known as Darlington transistors, connected to a common collector. The Darlington transistors are connected in series and the diodes allow for current to flow in both directions so that the ULN2001A can be used for switching applications.The ULN2001A has a wide range of applications and can be used in any circuit that requires the switching or controlling of large currents. Some examples of its applications include motor control, power supply control, relay control, power amplifier control, and lighting control. In addition, the ULN2001A can be used as a voltage regulator, to control the forward bias voltage of transistors, or as a current regulator in high-voltage applications.The ULN2001A is an easy-to-use and cost-effective solution for controlling large currents and is ideal for low-power microcontroller applications. Its wide range of applications and integrated protection make it a great choice for a wide range of applications.The ULN2001A works on the principle of using two sets of four Darlington transistors connected in series with a common collector. Each one of the eight transistors is typically rated to sustain 500 mA of continuous current and up to 50 volts of continuous current. When a low-current integrated circuit output signal is applied to the base of one of the transistors, the collector-emitter current is increased, allowing the device to act as a switch.In order to protect the transistors from over-current, the ULN2001A also includes four diodes in each subsystem. The diodes protect against transient currents which may occur in some applications due to the high operating speed of the transistors and also protect against reverse currents which could damage the transistors.In applications where the current exceeds the maximum ratings of the transistors, it is possible to use additional power transistors for higher current capability. The ULN2001A is also available in a larger version (ULN2002A) with higher current ratings. For example, the ULN2002A is capable of sustaining up to 2A of continuous current and up to 60 volts of continuous current.Overall, the ULN2001A is a useful, easy-to-use, and cost-effective solution for controlling large currents and switching applications. Its wide range of applications, integrated protection, and large current ratings make it an ideal choice for various applications where high-current capability and low signal levels require switching.

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