Understanding 5mm RGB LEDs: Common Anode VS Common Cathode

RGB LEDs are a fundamental component in modern lighting and display applications, offering a vast array of colours by combining red, green, and blue light. Among the various types available, the 5mm RGB LED is one of the most popular due to its compact size and ease of use. This article explores its specifications, configurations, and applications, helping you understand the difference between Common Anode and Common Cathode RGB LEDs.

RGB LED Common Anode & Common Cathode

Physical Dimensions and Specifications

The 5mm RGB LED is a four-pin, through-hole LED that integrates three different LEDs in one package. Here are some key specifications:

Dimension and Specification of RGB LEDs

Common Anode vs. Common Cathode RGB LEDs

Common Anode RGB LED

In a Common Anode configuration, all three LEDs share a single positive (anode) connection. To control the colour output, each LED's cathode is connected to the ground through a current-limiting resistor.

Blue Colour Common Anode LED RGB

Red Colour Common Anode LED RGB

Green Colour Common Anode LED RGB

The brightness and colour of the LED are adjusted by varying the voltage applied to each cathode.

Common Cathode RGB LED

In a Common Cathode configuration, all three LEDs share a negative (cathode) connection. Instead of grounding the cathode, each LED's anode receives a positive voltage through a resistor. 

 Blue Colour Common Cathode LED RGB

Green Colour Common Cathode LED RGB

Red Colour Common Cathode LED RGB

Adjusting the applied voltage controls the brightness and color output.

Pin Configuration

A 4-pin RGB LED includes the following connections:

• Red: Controls the red LED
• Common Anode/Cathode: Shared positive or negative connection (typically the longest pin)
• Green: Controls the green LED
• Blue: Controls the blue LED

Conclusion

Understanding the difference between Common Anode and Common Cathode RGB LEDs is crucial for choosing the right LED for your project. Whether you're working on decorative lighting, digital displays, or interactive electronics, the 5mm RGB LED offers an easy and effective way to implement full-color illumination.

Tools and components

Shopee:

1. RGB LED 5mm
2. Large Breadboard

Lazada:

1. RGB LED 5mm
2. Large Breadboard

Aliexpress:

1. RGB LED 5mm
2. Large Breadboard

Video

Would you like to learn more about how to integrate these LEDs into your projects? Let us know in the comments below! And don’t forget to like, share, and subscribe for more electronics tutorials! 🚀