Working
3mm blue LEDs emit light when a forward voltage is applied. The LED uses semiconductor materials such as Indium Gallium Nitride (InGaN) to produce blue light. When electrons recombine with holes in the semiconductor, they release energy in the form of blue light with a wavelength around 450–495 nm.
Applications
- Used in displays, particularly for TVs and computer monitors.
- Common in automotive lighting (headlights and dashboard lights).
- Used in optical storage devices (Blu-ray players).
- Illumination for signage and decorative lighting.
- Backlighting in electronic devices such as keyboards and TVs.
Specifications
- Forward Voltage: 3.0–3.5V
- Forward Current: 20mA (typical)
- Brightness: 500–1000 mcd
- Wavelength: 450–495 nm
- Size: 3mm diameter
Pinout
The 3mm blue LED has two pins:
- Anode (+): The longer pin, connected to the positive terminal of the power supply.
- Cathode (-): The shorter pin, connected to the ground (GND).
