R7YD

Voltage - Forward (Vf) (Typ):	2V
Height (Max):	7.70mm
Size / Dimension:	--
Supplier Device Package:	--
Package / Case:	Radial
Features:	--
Wavelength - Peak:	590nm
Wavelength - Dominant:	--
Mounting Type:	Through Hole
Viewing Angle:	120°
Current - Test:	20mA
Series:	--
Lens Style/Size:	Rectangle with Flat Top, 7.00mm x 2.40mm
Millicandela Rating:	8mcd
Lens Transparency:	Diffused
Lens Color:	Yellow
Color:	Yellow
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

LED indications are devices used to indicate the on or off state of an electronic circuit or system. LED indications are highly useful in that they provide very accurate visual status display or as part of an audio-visual warning system. One type of LED indication is the discrete LED indicator, commonly referred to as R7YD. This article will examine the R7YD application field and working principle.

Features

The R7YD discrete LED indicator is a type of single-colour LED light source with a relatively large viewing angle of 35°. It is available in three distinct sizes, the 16x16, 22.3x14.3 and 22.3x22.3. These sizes correspond to a range of 15-20mm (16x16) to 25-35mm (22.3x22.3) in terms of mounting diameter. It uses a single 5VDC voltage and is significantly compact, offering excellent space-saving potential. Further, as it is RoHS compliant, it eliminates the need to worry about potential environmental hazards.

Applications

The versatile R7YD LED indicator is widely used for a variety of applications. Examples include a range of medical devices, old and new air conditioning systems, train control systems and LED street lamps. It is also used widely in industrial automation. In the automotive industry the LED indicator can be used for warning light indication. The indicator is also used in household appliances, clothing machinery and office equipment.

Working Principle

The working principle of the R7YD LED indicator is based on the electrical current passing through the circuit and being applied on the anode and cathode (also called the positive and negative terminals) of the LED. This electrical current results in the illumination of the LED, similar to how a standard bulb works. Depending on the LED design, the LED’s light output is either constant or variable in intensity. When the LED is in use, the current will be passed through a resistor in order to limit the amount of current flowing through the LED and optimize the light output. The output of the LED indicator is then monitored with a photo-resistor to measure the intensity of light output.

Conclusion

As a popular choice for discrete LED indicator applications, R7YD can be used in a range of applications from medical devices to office equipment and industrial automation. It is available in a variety of sizes and requires just a single 5VDC voltage for operation. The working principle of the R7YD discrete LED indicator is based on electrical current passing through its circuitry and being applied on its anode and cathode terminals. Although its applications range widely, its principles remain the same.

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