4N27SR2VM

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Optoisolators, also known as optocouplers, are semiconductor devices used to keep electrical circuits separate. They transfer electrical signals between two isolated circuits using light to bridge the gap between them. The 4N27SR2VM is an optoisolator composed of a transistor, photovoltaic output and is specially suited for demanding applications such as communication systems, control systems, and power conversion. In this article, we will examine the application fields and working principles of the 4N27SR2VM.

Application Fields

The 4N27SR2VM is designed to operate within a 6.0-20.0 V range to provide both isolation and drive capabilities. Its operating temperature range is from -55 to +125 ℃, and it is offered in an eighth-sized So-8 package. It is suitable for use in a wide variety of applications, including power supplies, solenoid, relay, and motor control, as well as industrial and communication system controls. It is also optimal for medical equipment, ultrasound systems, and oscilloscopes.

Due to its highly consistent performance and superior insulation safety, the 4N27SR2VM has the potential to replace older-generation optocouplers in applications where performance requirements are more stringent. Its improved response time and low output-on voltage allows it to be used in high-speed applications, such as servers, switches, and routers.

Working Principle

The 4N27SR2VM functions by the application of a voltage across the optoisolator’s two-legged photodiode (1st leg) which causes the LED to emit light (2nd leg). This light hits the photodiode and generates a photocurrent that passes through the transistor gain element, turning on the transistor. The output of the optoisolator then applies the voltage to the load.

When the voltage on the input of the optoisolator drops below its transistor-on threshold and sufficient light is no longer being generated by the LED, the photodiode then stops generating photocurrent and the optocoupler’s transistor turns off. The output of the transistor then drops and the voltage applied to the load is eliminated.

The 4N27SR2VM is designed with a no self-heating function which allows it to have even responses to fluctuations in input current. This allows it to operate without needing any additional components to help minimize any thermal runaway phenomena, and its differential resistance is optimized for fast response times.

Conclusion

The 4N27SR2VM optoisolator is designed to provide both isolation and drive capabilities, making it suitable for a variety of applications. Its operating temperature range, high insulation safety, and improved response time ensures the reliability of its operation. As such, it is an ideal choice for demanding applications, such as communication systems, control systems, and power conversion to replace older-generation optocouplers.

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