56822433333

Series:	568
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Color:	Yellow (x 12)
Wavelength - Peak:	585nm
Configuration:	4 High x 3 Wide
Current:	20mA
Millicandela Rating:	30mcd
Viewing Angle:	45°
Lens Type:	Tinted
Lens Style/Size:	Round with Domed Top, 3mm (T-1)
Voltage Rating:	2.1V
Mounting Type:	Through Hole, Right Angle

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LEDs - Circuit Board Indicators, Arrays, Light Bars, Bar GraphsLight Emitting Diodes (LEDs) are an integral component of many circuit board applications. LED’s are used in many different ways including for status indicators, for warning lights, for displays, for counter lamps, for input/output interface indicators and as part of larger lighting arrays. This article will cover the basics of LED’s and their usage in common circuit board applications.LED’s are two-terminal semiconductor devices that emit visible light in response to electrical current. A common LED consists of two semiconductor layers forming the p-n junction which is the source of the light output. The negative side of the junction is the anode and the positive side is the cathode. The amount of light emitted is proportional to the current flow through the device.LEDs are rated by their efficiency in converting electrical energy into light energy. The type of LED used in an application will depend on the desired brightness for the application. There are many different types of LEDs available with efficiencies ranging from around .01 Lumens/Watt to more than 100 Lumens/Watt.LEDs are commonly used in circuit board applications as indicators and displays. Examples include indicator lights, night light displays, bar graph displays and more. Indicator lights provide a visual indication of the status of a switch, a power supply, or any other electronic component. A display indicates information in a more organized manner, usually in the form of a readout. Common display types include LCDs, LED arrays or dot matrix displays.LEDs are also very common as part of lighting arrays. A lighting array can be used to provide a variety of lighting options and effects. Common lighting array applications include backlighting on cellphone or laptop displays, as part of illuminated signs, or as backlighting for analog or digital displays.LEDs can also be used as bar graphs to display data, such as the temperature of a certain component, in a visual manner. Bar graphs are an ideal way to monitor or display the status of a device. LEDs provide a low-energy and low-maintenance alternative to incandescent and fluorescent lighting systems.Finally, LEDs can also be used in conjunction with other electronic components to provide optical services, such as laser aiming devices and fiber optic amplifiers. These applications are generally more complex, and use multiple LED components integrated into more complex circuitry.In conclusion, LEDs are an important and versatile component of many circuit board applications. LEDs are used for indicator lights, displays, lighting and image optics. The efficiency and low-cost of LED’s makes them ideal for use in a variety of applications from basic circuit boards to complex imaging systems. LED’s have seen tremendous advances in efficiency, power, and application flexibility during the past few decades, and will continue to evolve as the key illumination technology in the future.

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