ULN2003AIDRE4

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The ULN2003AIDRE4 is a high-voltage, high-current darlington transistor array. It consists of seven darlington pairs that feature a high-voltage, high-current open-collector output. The ULN2003AIDRE4 can be used in many applications such as driving high-power loads, motor control, switching and solenoid circuits, interfacing to high-powered DC-voltage devices, and more. This article will discuss the application field and working principle of the ULN2003AIDRE4.

Application Field

The ULN2003AIDRE4 is designed for use as an interface between low-level logic circuits and high-power loads. It can be used in applications such as motor control, switching and solenoid circuits, and interfacing to high-powered DC-voltage devices. It is suitable for driving motors up to 1A, solenoids, relays, and lights, among other applications.

The ULN2003AIDRE4 can also be used in embedded control applications. It is particularly suitable for embedded applications because of its high current and voltage rating and its low power consumption.

Working Principle

The ULN2003AIDRE4 consists of seven darlington pairs that feature a high-voltage, high-current open-collector output. Each darlington pair consists of two native NPN transistors: the high input impedance base of the first NPN transistor is driven by a low voltage signal from an external device such as a logic circuit, and the collector of the first device is connected to the base of the second NPN transistor. The collector of the second NPN transistor is connected to the output pin of the ULN2003AIDRE4.

When a low logic signal is applied to the input pin, the first NPN transistor turns on, allowing current to flow from the collector of the second transistor to the output pin. This causes the output pin to go low, indicating that the logic circuit driving the input is in a logic low state. Similarly, when a high logic signal is applied to the input, the first NPN transistor turns off, and the output pin goes high, indicating that the logic circuit driving the input is in a logic high state.

The ULN2003AIDRE4 has a built-in 1.6kΩ suppression resistor between the input and output pins, which prevents high dV/dT transients from damaging the device. Additionally, the ULN2003AIDRE4 has a built-in 500V surge voltage suppression feature, which provides protection against transient voltage spikes.

Conclusion

The ULN2003AIDRE4 is a high-voltage, high-current darlington transistor array. It is designed for use as an interface between low-level logic circuits and high-power loads, and it is suitable for driving motors up to 1A, solenoids, relays, and lights, among other applications. It consists of seven darlington pairs that feature a high-voltage, high-current open-collector output, and it has a built-in 1.6kΩ suppression resistor between the input and output pins, as well as a built-in 500V surge voltage suppression feature.

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