3mm LED indicator lights are small, energy-efficient light-emitting diodes primarily used to display status or signal information in electronics, control panels, and DIY projects. Because of their compact T1 package size (3mm diameter), they are ideal for tight spaces where a 5mm LED would be too large.

Key Specifications
When working with or purchasing a 3mm LED indicator light, keep these standard operating parameters in mind:
• Operating Current: Typically 20mA for standard indicator functionality.
• Forward Voltage: Varies significantly by the color of the LED:
    • Red / Yellow / Orange: 1.8V to 2.1V
    • Green: 1.9V to 2.1V
    • White / Blue / UV: 2.8V to 3.4V
• Polarity: Standard through-hole variants feature a longer leg for the Anode (+) and a shorter leg for the Cathode (-).