FluxBench

LED

semiconductor Symbol: LED

Light Emitting Diode - a semiconductor component that emits light when current flows through it

LED

An LED (Light Emitting Diode) is a semiconductor component that emits light when Current flows through it in the forward direction.

What it is

LEDs are diodes that emit light. They have a forward Voltage drop (typically 1.8-3.3V depending on color) and require a Resistor to limit Current.

Forward Voltage Reality

Different LED colors have different forward Voltage drops:

  • Red/Yellow: 1.8-2.2V
  • Green: 2.0-2.4V
  • Blue/White: 3.0-3.3V
Tip

Always check the datasheet for your specific LED’s forward Voltage. Using the wrong value in calculations will result in incorrect Resistor values.

How you use it

LEDs are used for:

  • Status indicators
  • Displays and panels
  • Lighting applications
  • Visual feedback in circuits

Always use a Resistor in series with an LED to limit Current. Use the LED Series Resistor Calculator to find the correct value.

Gotchas

Warning

Polarity matters - LEDs only work in one direction. The longer lead (anode) goes to positive Voltage, shorter lead (cathode) to Ground.

  • Forward Voltage varies by color and manufacturer
  • Too much Current will destroy the LED
  • Always use a current-limiting Resistor
  • Reverse Voltage can damage LEDs

This component relates to Voltage, Current, Resistance, and Diode. Essential for visual indicators and displays.