Voltage - Forward (Vf) (Typ):	2.1V
Height (Max):	1.10mm
Size / Dimension:	3.20mm L x 1.60mm W
Supplier Device Package:	SMD
Package / Case:	1206 (3216 Metric)
Features:	--
Wavelength - Peak:	555nm
Wavelength - Dominant:	--
Mounting Type:	Surface Mount
Viewing Angle:	70°
Current - Test:	20mA
Series:	--
Lens Style/Size:	Rectangle with Flat Top, 1.40mm x 1.60mm
Millicandela Rating:	2.7mcd
Lens Transparency:	Diffused
Lens Color:	--
Color:	Green
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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7021X15 Application Field and Working Principle of LED Indication – Discrete

LED (Light Emitting Diode) is a device that converts electric energy into light energy because of its semiconductor structure, and it is also called "light-emitting diode." 7021X15 LEDs are diodes that are specifically made to be used as indications as they are small in size and low power consuming. The 7021X15 LEDs are extensively used in various application fields due to their amazing features like ultra-bright LEDs, low power consumption, a wide viewing angle and the ultra-thin form factor. Application fields:7021X15 LEDs are used in many application fields and each of them uses the same basic physical structure of the LED. They are used in interior and exterior lighting, traffic signals, automotive lighting, domestic appliances, industrial lighting, scientific/medical applications, general illumination and signage. In commercial and industrial applications, 7021X15 LED is widely used as indicator of failure and other alerts. In automotive engineering field, 7021X15 LED are used as Door Open Indication signals, Fuel Low Indication signals, Head Light Light signals and Temperature Alert signals. It is also used in domestic appliances like TV, chargeable fan, stand fan, headphones, refrigerator, etc and they can be used as indication of fault in the appliances. In the medical field, LEDs are used as indication of critical levels of patient in the form of alert. Also, it is used in devices that measure the vital signs like body temperature, heart rate and breathing, to indicate that the reading is ready. In scientific and research fields, LED is widely used for simple experiments, light source for plant processes, generic LED for safety, etc. Working Principle: LED works on the principle of electroluminescence. It is a basic process of converting electrical energy into light energy. This is a phenomenon based on Rawl’s theory of radiative recombination. When a voltage is applied to the two electrodes connected to the semiconducting material, then the electrons and holes are attracted towards each other and recombine. This process releases photons, which are visible as light. Depending on the material used and the applied voltage, the wavelength of light is different. 7021X15 LEDs are more efficient than electricity due to their semi-conductive material and they emit more light than their incandescent counterparts, making them cost effective and environment friendly.The 7021X15 LEDs have greater efficiency, as they consume very less power and are reliable as they last longer. LEDs are made with a combination of semi-conductors and organic material like alumina. In the organic material, the thin film is sandwiched between two electrodes and a thin layer of semi-conductive material is added on top.When the electric current passes through the two electrodes, a voltage is applied to the forward side of the anode and a reverse voltage is applied at the cathode. This causes the semi-conductive molecules to start vibrating and heat is released from them. Due to this mechanism, photons are released in the form of light which illuminates the LED.Moreover, the amount of energy released from LEDs depends upon the voltage applied to them. The angle of illumination depends on how the LEDs are designed, for instance, the number of lenses in the LED. The higher number of lenses, the wider the range of visibility.

Conclusion

The 7021X15 LED Indication – Discrete is a device that converts electric energy into light energy and they are small and cost effective. 7021X15 LEDs are widely used in various applications like traffic signals, automotive lighting, domestic appliances, medical devices, etc.LEDs work on the principle of electroluminescence where a voltage is applied to semi-conducting material and electrons and holes recombine, which generates photons in the form of light. The greater number of lenses in an LED gives a wider range of visibility and LED consumes very less power making it environment friendly.

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