QL202GD Optoelectronics

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LEDs are becoming increasingly popular for a variety of applications, from automotive and consumer electronics to industrial processes. Among the most popular of all LED components is the QL202GD, a discrete two-color LED. Here we’ll discuss the application fields of the QL202GD and its working principle.

Application Field of the QL202GD

The QL202GD is a two-color LED typically used for discrete indication. It combines green and red light in the same package, so it can be used to indicate different states of a process. Because of its dual colors, it is often used to indicate both a given level and error state. This makes the QL202GD perfect for signaling operations on factory assembly lines, as well as sophisticated alarm systems in automatic machinery. Additionally, it’s also well suited for use in medical devices, due to its ability to easily distinguish between different states of operation.

Design and Working Principle

The QL202GD uses two individual light emitting diodes that are packaged in a single housing, with one green diode and one red diode. The two colors can be combined when two separate currents are applied to the LEDs – either one to the red LED and one to the green LED, or one to both LEDs for a simultaneous emission of both colors. You can also apply different currents to the two colors to achieve blended colors, such as yellow.

The operating current of the QL202GD is typically around 15mA, but its maximum peak current can reach 30mA. It’s usually driven by a transistor or its derivative to increase the load current and voltage stability. The QL202GD can work at a voltage range of 2.5V to 24V, making it suitable for different application scenarios.

Conclusion

The QL202GD is a versatile two-color LED component that can be used to achieve discrete indication for various applications. It is typically used for indicating different states in factory processes and assembly lines, as well as in sophisticated alarm systems in automatic machinery. It can be driven by a transistor or its derivatives, and operate in a wide voltage range of 2.5V to 24V.

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