LED symbols

About these LED symbols

LEDs are unique semiconductor devices that are used to emit light in any circuit that is connected to them. LEDs are used in different applications, including lighting, display, communication, and detection.

Here one can observe RGB LEDs, which produce red, green, and blue light. These LEDs are good for forming one or another color, combining these basic ones, for example, on sticks. Surface-mount LEDs (SMDs) are small in size and can be soldered directly to circuits for boards which are designs that may require limited space.

Infrared LEDs generate infrared light that is inappreciable to humans although used abundantly to manufacture remote controls and sensors. Bi-color LEDs can produce two forms of light from two different colors, and using the direction of the voltage applied can prove useful for signaling.

Through-hole LEDs include a provision of leads that are passed through holes in a circuit board. This is the popular method of mounting LED; it is common with the old designs of the LED. Alphanumeric LEDs are intended for showing just characters and numbers, thus it is widely represented in signs, clocks, and varieties of other digital applications.

Ultraviolet LEDs produce beams of ultraviolet light that cannot be seen by the naked human eye. They are used in sterilization, curing of materials, and other related industrial uses.

It’s hoped that through the review of these LED symbols and their characteristics, engineers will be better placed to select the correct type of LED for use in certain applications to enhance the application of appropriate lighting, display, or sensing solutions.

Let's take a look at a few important LED symbols:

RGB LED

This type of symbol produces red, green, blue colours and through an appropriate combination of these colours, other colours can be produced.

Surface-Mount LED (SMD)

This type of symbol is packaged in a way that can be soldered onto the top of the circuit board, an LED package that has been designed for today's densely packed electronics.

Infrared LED

This type of symbol produces near-infrared light which is invisible to the human naked eye, and is used in remote controls, night vision devices, and sensors.

Bi-color LED

This type of symbol is designed to emit two different colors in response to the polarity of the voltage applied across them-business usually used in dual-state indication or signaling applications.

Through-Hole LED

An apparently classic symbol where pointers are connected through holes on a PCB; often seen in older style designs for higher power uses.

Alphanumeric LED

This type of symbol displays alphabetic symbols, numbers, and items and is applied in countdown numbers, clocks, and notices.

Ultraviolet LED

This kind of LED symbol produces ultraviolet light which is good for use in disinfection, drying, and in other areas where ultraviolet light is used in a reaction.