APED3528SEC/J4

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APED3528SEC/J4 is an application field and working principle of LED indication, also referred to as discrete LED, which is a type of display device especially suitable for industrial, commercial, instrumentation and consumer applications.

A discrete LED consists of two parts - the LED die and an encapsulant, mainly epoxy resin. It is a two-terminal point-source of light with a very small form factor that can be mounted with ease. The encapsulant is used to protect the LED die from damage due to light, EMI, and moisture intrusion. The encapsulant also prevents electrical leakage. The two-terminal point-source is the main benefit of a discrete LED device.

The LED die, also known as the die or dielectric material, is a small piece of semiconductor material that emits light when current is applied to it. It is usually made of an organic material such as polycarbonate, epoxy, silicone, or other suitable material. It is the most delicate and sensitive part of the LED and requires the maximum protection against any mechanical or electrical damage.

Discrete LED devices usually have the LED connected to an LED driver. The LED driver is the circuitry that applies a current to the LED to make it emit light. This current is determined by the voltage drop across the two terminals of the LED. The LED driver is usually a very small integrated circuit mounted on the board of the LED.

The main application fields for discrete LEDs are instrumentation, decorative lighting, and automotive lighting. In instrumentation, the LED is used to display a status or a value in the form of lights. The LED can also be used in a very small space and is ideal for applications with very small form factors. In automotive lighting, LEDs are used in headlights as well as in various switches and instrumentation panels. LEDs are also increasingly popular for decorative lighting in homes and buildings.

The working principle of LED indication is fairly simple. When current is applied across the two terminals of the LED, electrons flow through the LED die and this causes the LED die to emit light. The current through the LED is controlled by the LED driver, which senses the voltage drop across the two terminals and adjusts the current accordingly. This current is what determines the intensity of the emitted light. The intensity can be adjusted by changing the voltage applied to the LED, or by changing the amount of current flowing through it.

In conclusion, discrete LEDs provide a very efficient way to display status or values, often in very small form factors. They are also increasingly popular for decorative lighting in homes and buildings. The working principle of a discrete LED is simple and the device is relatively easy to use. However, it is important to note that, like all electronic components, LEDs need to be properly handled and properly driven so as to ensure their longevity.

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