Dual Color LED

Simple Yet Effective Indicator LED To Indicate Different States Via Different Colors

Dual color LED help save space: instead of using a separate green and a red LED, for example, a single bi-color LED can indicate both states by changing its color. They exist in any available LED color combination.

Two LED with different colors

What sets them apart is that internally, they use two separate LED with different colors. It’s essentially a 2-in-1 package.

You could as well use a RGB LED to show different colors. For indicator purposes where just two states matter, dual color LED are simpler (and cheaper).

Identifying Anode and Cathode

The middle pin serves either as common anode (+) or common cathode (-), depending on LED type.

The other two pins connect to the respective internal LED, one per color.

You control both colors individually and can power them individually or at the same time, essentially mixing colors: the LED therefore can display three different colors.

The forward voltage depends on LED color. Since both internal LED display different colors, their specs are different, too. You need different series resistors for each of the two internal LED.


Please do leave comments below. I am using utteran.ce, an open-source and ad-free light-weight commenting system.

Here is how your comments are stored

Whenever you leave a comment, a new github issue is created on your behalf.

  • All comments become trackable issues in the Github Issues section, and I (and you) can follow up on them.

  • There is no third-party provider, no disrupting ads, and everything remains transparent inside github.

Github Users Yes, Spammers No

To keep spammers out and comments attributable, all you do is log in using your (free) github account and grant utteranc.es the permission to submit issues on your behalf.

If you don’t have a github account yet, go get yourself one - it’s free and simple.

If for any reason you do not feel comfortable with letting the commenting system submit issues for you, then visit Github Issues directly, i.e. by clicking the red button Submit Issue at the bottom of each page, and submit your issue manually. You control everything.


For chit-chat and quick questions, feel free to visit and participate in Discussions. They work much like classic forums or bulletin boards. Just keep in mind: your valued input isn’t equally well trackable there.

  Show on Github    Submit Issue

(content created Mar 01, 2024 - last updated Mar 18, 2024)