Common Anode vs Common Cathode in Push-Button LEDs
06-02-2025
Which One Do You Use?
When designing push-button LED applications, selecting the right configuration is crucial for efficient circuit control. The two most commonly used setups are Common Anode and Common Cathode.
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Common Anode: All positive terminals (anodes) are connected to a single voltage source. The LEDs are controlled via the negative terminals (cathodes). This is the best choice when the circuit sinks current.
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Common Cathode: All negative terminals (cathodes) are connected to ground (GND), while the LEDs are controlled via the positive terminals (anodes). This setup works best when the circuit sources current.
A simple rule of thumb helps with the selection:
- Does your circuit sink current? Use Common Anode.
- Does your circuit source current? Use Common Cathode.
These configurations are widely used in RGB LEDs and multi-color push buttons. Clear diagrams and visual examples help engineers and developers understand the differences.
Need guidance on choosing the right LED configuration for your application?
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