4N35W

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Optoisolators are components that use optical or electrical signals to provide communication between two isolated circuits, thereby providing a highly reliable isolation barrier between them. The 4N35W optoisolator is a type of optoisolator that is most suitable for applications involving transistors or small loads. These components offer a variety of features including superior speed, accuracy, reliability and resistance to vibration, shock and environmental extremes. In this article, we’ll discuss the application field and working principle of the 4N35W optoisolator.

Application Field of the 4N35W Optoisolator

The 4N35W optoisolator has a variety of applications in fields such as industrial automation, factory automation, automotive, medical devices, robotics, and consumer electronics. Due to its high reliability and low power consumption, the 4N35W optoisolator is highly suitable for applications in harsh environments. The optoisolator is also suitable for use in safety systems, where a high degree of isolation is required.

In industrial applications, the 4N35W optoisolator can be used to substitute low-intensity LEDs as the input device, and a transistor as the output device in devices such as light curtains or safety switches. In factory automation, the optoisolator can be used as a link between a PLC or CPU and its external data acquisition devices, and to replace relays in controlling valves. In automotive applications, the optoisolator can be used to isolate signal and to reduce the needs for additional wiring. In medical devices, the optoisolator can be used to control sensing signals and to shield against environment noise.

Working Principle of the 4N35W Optoisolator

The 4N35W optoisolator consists of an infrared LED and an NPN phototransistor. The LED is activated by an input signal and emits infrared light which is received by the phototransistor. The phototransistor acts as a lever and produces an output signal, which can then be used to control the circuits. Due to the high degree of insulation provided by the optoisolator, the output signal is completely isolated from the external noise or disturbances.

When the LED of the 4N35W optoisolator is activated by an input signal, it emits infrared light and the phototransistor begins to turn on. The phototransistor creates a weak base-emitter voltage which is amplified by the transistor’s collector, creating an output signal. The output signal is then used to control the circuits. In applications where an LED cannot be used, a phototransistor can be used as an input device. In this case, the phototransistor will be sensitive to environmental light, and the connection must be shielded against it.

The 4N35W optoisolator has a wide variety of input currents, ranging from 0.5mA to 55mA, and a wide variety of configurations, ranging from single LED to multi-channel. It is rated to operate over a temperature range of -20°C to 70°C, and has an isolation voltage rating of up to 5kV. The optoisolator can also be used in a variety of applications, including analog and digital signals, motor control, and AC/DC switch control.

Conclusion

The 4N35W optoisolator is a highly reliable, compact optoisolator that is suitable for a wide range of applications in industrial, factory, automotive, medical and robotic fields. The optoisolator has a wide range of input currents, is rated to operate in both harsh and mild environments, and offers superior insulation against external noise and disturbances. The 4N35W optoisolator is a cost-effective and reliable device suitable for a wide variety of applications.

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