AA4040QBS/D

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Good illumination of physical objects has always been a popular method of indicating the activities, statuses and operations of a device. LED indicator lights, one type of light source, can serve the same purpose by indicating intent, urgency and awareness. One example of an LED indicator is the AA4040QBS/D, with its application field and working principle giving us a better insight into how this light source operates.

Application Field

The AA4040QBS/D is a type of LED indicator typically used for status displaying, instructional and warning notifications, dashboard controls and environmental illumination tasks. It has an identifier code that represents height and color characteristics, and the device is constructed from a series of SMDs (surface-mount components). The packaging style used in the device is 4 mm blister-packed and its centerline intensity reaches up to 600 mcd (millicandellas). The current range the AA4040QBS/D can handle is from 10mA to 20mA.

Working Principle

The working principle of an LED indicator is usually the same: a light source emits an energy-efficient and longer light-emitting diode (LED) light, which then serves as a visible warning or status display. The current flow of the LED indicator is controlled by changing the voltage across it, and this is usually done by its connected circuit board. A current limiting resistor is also used to ensure that the LED operates at the correct voltage and to protect it from short-circuiting and over-voltage. The resistor is usually set to the same current flow as the LED, and the output voltage is then proportionally adjusted accordingly.

Conclusion

In conclusion, the AA4040QBS/D is a type of LED indicator typically used for status displaying, instructional and warning notifications, dashboard controls and environmental illumination tasks. It has an identifier code representing height and color characteristics, and the current range it can handle is from 10mA to 20mA. Its working principle is based on the concept that a current flow is controlled by changing the voltage across it, and a current limiting resistor is used to ensure that the LED operates at the correct voltage and to protect it from short-circuiting and over-voltage.

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