E-ULN2001A

Series:	--
Packaging:	Tube
Part Status:	Obsolete
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):	--
DC Current Gain (hFE) (Min) @ Ic, Vce:	1000 @ 350mA, 2V
Power - Max:	--
Frequency - Transition:	--
Operating Temperature:	150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	16-DIP (0.300", 7.62mm)
Supplier Device Package:	16-DIP

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E-ULN2001A Application Field and Working PrincipleThe E-ULN2001A is a high-performance, low-cost, high-density integrated circuit that is used in many different applications. Its main purpose is to protect transistors and other sensitive components in circuits by providing isolation and overload protection. It is designed to be suitable for use in a wide range of power supplies, audio power amplifiers, motor drivers, digital circuits, and other applications.The E-ULN2001A is a current amplifier that is composed of 6 separate input/output (I/O) channels. Each channel is capable of sourcing or sinking 500mA at a voltage of up to 50V. The device can also support peak currents up to 3A per channel. The output is protected from overload conditions, allowing the device to be used in safety-critical applications without the need for careful circuit design.The E-ULN2001A is an array of bipolar transistors that are connected in an integrated circuit form. Each transistor has an emitter, a base, and a collector. The emitter is the source of electrons, while the base and the collector control the flow of those electrons. The transistors are connected in parallel, with each channel having two input transistors and two output transistors — a source, or “high side” driver, and a sink, or “low side” driver.When a positive voltage is applied to the input of one of the channels, the two input transistors become forward biased. This allows current to flow from the emitter of one transistor to the collector of the other, with the base currents of both transistors providing regulation of the load current.When a negative voltage is applied to the input, the two input transistors become reverse biased. This causes the current to flow from the collector of one transistor to the emitter of the other. The base currents of both transistors provide the necessary control and regulation.The E-ULN2001A is capable of providing either mirror or totem-pole outputs, depending on the circuit requirements. In a mirror output configuration, both high side and low side transistors are turning on simultaneously — for instance, when the load needs to be driven high, the high side transistor is activated, and when the load needs to be driven low, the low side transistor is activated. In a totem-pole output configuration, only one of the transistors is activated at any one time.The main applications of the E-ULN2001A are in industrial, automotive, and consumer applications. Its use in industrial settings is notable in its applications as motor drivers, digital circuit and power amplifier protection, and in high current switching applications. In automotive settings, it is used to control power doors, seats, and other automotive accessories. In consumer applications, it has been widely used in consumer electronics and consumer appliances, such as TVs and air conditioners.In summary, the E-ULN2001A is a high-performance, low-cost, high-density integrated circuit that is used in many different applications to provide effective overload and isolation protection for transistors and other components. The device is composed of 6 input/output channels, each of which can source or sink up to 500mA of current at up to 50V. It is capable of providing either mirror or totem-pole outputs, and can be used in a wide range of applications from industrial to consumer applications.

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