0402 light-emitting diodes are generally called 0402LED or 0402LED lamp beads. The regular size of 0402LED lamp beads is 1.0*0.5*0.4mm. It has a wide range of applications, such as various home appliances, digital, communications, automotive electronics, lighting, electronic toys, Traffic instructions, medical beauty equipment, electronic teaching equipment, electronic clocks and so on. The 0402 Light Emitting Diode is a tiny light bulb that is easily assembled into an electronic circuit. But they don't contain burnout filaments like regular incandescent bulbs, and they don't get particularly hot over time. They emit light as a result of the movement of electrons within the semiconductor material, and they last as long as regular transistors.

    What are the advantages of 0402 SMD LED light-emitting diodes compared with traditional incandescent lamps? First, they don't have burnout filaments, so they last longer. Plus, small plastic bulbs make them more durable. Also, they are easier to fit into modern circuits. In fact, the main advantage of LED lamp beads is their high efficiency. Traditional incandescent lamps emit a lot of heat when they emit light. This thermal energy will be completely wasted unless we use the lamp as a heater, since most of the electricity does not produce visible light. The heat generated by the LED is very small, and the percentage of the electric energy directly used to emit light is much higher, which can greatly reduce the electricity demand.