![]() ![]() The datasheet can only be found if the part number of the RGB LED is known. ![]() For example, the forward voltages of each LED in the RGB LED and maximum current rating. Datasheets contain the pin numbers of parts, and their electrical characteristics. Every electronic manufacturer supplies datasheets for its components that contain technical details for each component. ![]() The primary source of information on an RGB LED, or any electronic component, is from the manufacturer’s datasheet. Three methods to determine if a RGB LED is common anode or common cathode are firstly to check the datasheet, secondly test using a multimeter, and thirdly, test using a breadboard circuit. How to Test if a RGB LED is Common Anode or Common Cathode Once again, not all common cathode LEDs have the same pin numbering. In other words, pin 2 is the common cathode, or where the three LED cathodes join. As with the common anode above, this symbol has pin 2 as the common pin. That is, it is the schematic symbol or circuit diagram symbol of the common cathode RGB LED. The following image shows the internal wiring of a common cathode RGB LED. How to test the RGB LED follows the next subsection. It is important to note that not all common anode RGB LEDs have the same pin numbers. In other words, this is where all the anodes of the LEDs join. As can be seen in the symbol, pin number 2 is the common anode. That is, it is the schematic symbol or circuit diagram symbol. The following image shows the internal wiring of a common anode RGB LED. That article shows what an LED anode and cathode is. ![]() For more information on normal LEDs, see the article on the basics of LEDs for beginners. The following images show how the individual LEDs in a RGB LED are configured. Internal Wiring of RGB LEDsĪs already mentioned, an RGB LED has either a common cathode, or a common anode. After that, the next subsection looks at how to test if an RGB LED has a common anode or common cathode. The following subsection looks at the internal wiring of RGB LEDs. Other pins are the red, green and blue LED anodes. The longest pin of the RGB LED shown below is the common cathode pin. The following image shows a common cathode RGB LED, although a common anode RGB LED has a similar appearance. Alternatively it has all of the anodes joined together (a common anode RGB LED). It is basically three LEDs in a single package with either all the LED cathodes joined together (a common cathode RGB LED). Images are for representation purpose only actual product may differ from actual product.An RGB LED is a four pin LED.
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