ULN2004A DATASHEET PDF

Not Available Abstract: No abstract text available Text: in inches and millimeters unless otherwise specified. Values in brackets are metric equivalents ,. Values in brackets are metric equivalents. Dimensions are shown for reference purposes only , inches and millimeters unless otherwise specified. Values in brackets are metric equivalents , equivalents. Dimensions are shown for reference purposes only.

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Used as test pin or Voltage suppresser pin optional to use 10 to 16 Output 1 to Output 7 Respective outputs of seven input pins. So if you have anything that anything more than 5V 80mA to work, then this IC would be the right choice for you.

It has seven Darlington Pairs inside, where each can drive loads up to 50V and mA. Adding to that we can a ground and Common pin. The ground pin, as usual is grounded and the usage of Common pin is optional. It might be surprising to note that this IC does not have any Vcc power pin; this is because the power required for the transistors to work will be drawn from the input pin itself. In the circuit consider the LED to be the loads and the logic pins blue colour as the pins connected to the Digital circuit or Microcontroller like Arduino.

Notice that the Positive pin of the LED is connected to the positive load voltage and the negative pin is connected to the output pin of the IC.

This is because when the input pin of the IC gets high the respective output pin will get connected to ground. So when the negative terminal of the LED is grounded it completes the circuit and thus glows. The loads connected to the output pin can be maximum of 50C and mA each. However you can run higher current loads buy combining two or more output pins to gather. The COM pin is connected to ground through a switch, this connection is optional.

It can be used a test switch, meaning when this pin is grounded all the output pins will be grounded.

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