LN81RCPHL Optoelectronics

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LED Indication – Discrete: LN81RCPHL Application Field and Working Principle

Light-emitting diodes (LEDs) are an important element in the world of electronics and the development of the Internet of Things (IoT). LEDs can not only be used for lighting and lighting fixtures but are also used in many other applications, including data transmission and digital logic, as well as in solid state lighting. LED indication is a special application of LED technology, in which LEDs act as visual indicators to suggest a certain state or indicate a certain phenomenon. LED indication includes separate LED and LED display, and discrete LED indication is one of the main kinds of LED indication, belonging to the category of displayless LED indication. In this article, we mainly talk about LN81RCPHL as discrete LED indication and its application fields and working principles.

The LN81RCPHL is composed of a red, orange and green indicator consisting of three separate red, orange and green LEDs respectively. The typical forward voltage of these three LEDs are 2.1V, 1.8V, and 2.1V respectively, and the rated directions for the three LEDs are all 2mA. The ON/OFF operation of the three LEDs is activated by a voltage, a current or a resistance. The intersection of the three forward voltages of each LED allows them to be driven as a single unit, making it easy to achieve applications, such as indicating low/high/OK. The same color of three types of LEDs can be used together to form a three color indicator, with an insertion of a variable resistor, allowing the overall brightness to be adjusted. The maximum forward voltage of the three LEDs are 5V, and a higher forward voltage may cause damages.

The LN81RCPHL is suitable for various application fields, such as displaying current status of power supplies, machinery and other equipment, as well as providing visual feedbacks for high-end applications, like in telecoms and industrial controls. In addition, since LN81RCPHL or similar discrete LED indicator also can be used as discrete voltage or current supply, it’s also suitable for power management-related applications, such as power supply, battery or other chargers.

As for working principles, the LED indicator is a control circuit-based device. The LED indicator is always integrated in a control circuit, and the LED is the output point of the entire circuit. The control circuit can be composed of a variety of technologies and components, such as resistors, condensers, transistors, and more, which provides power to the LED and enables its light-up. When the power supply meets operating requirements, the LED will pass current to form a certain voltage drop, allowing the LED indicator to indicate the specified conditions.

The LN81RCPHL or similar discrete LED indicators are versatile programs when requiring indication of current states, signals or other warnings. With their small size, reasonable power restrictions, and the ability to be mounted easily, the discrete LED indicator, especially this device specifically, can be a good choice when it comes to LED indication.

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