4N26SM

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Optoisolators, also known as optical couplers, are semiconductor devices that use a short optical path to safely isolate two electrical circuits. One of the more popular devices is the 4N26SM, which is a transistor, photovoltaic-output optoisolator.

Overview

The 4N26SM features very precise optical parameters, as well as a low-power operation of 0.2mW for both the light source (LED) and the phototransistor output (collector-emitter). It operates on a broad supply voltage range of 1.2 V to 30 V and can effectively transfer a signal up to 25 kHz.

The 4N26SM has UL-approved applications and is package type compatible with DIP (dual in-line package) terminal blocks. It is classified as a type 1 optoisolator according to IEC/EN/DIN EN 60747-5-5, and has a CTI (comparable system current) of at least 300 V.

Applications

The 4N26SM optoisolator is designed to provide a reliable and secure isolation barrier between inputs and outputs. As such, it is commonly used in a wide range of applications, including level converters, high-voltage level detectors, IEC protection circuits, and power-control systems, among others.

4N26SM optoisolators can also be used in motor speed monitoring and sheet-fed photoelectric sensing applications. They can also help to increase the safety of gate strogen signals in HVAC control circuits, in addition to helping decrease noise for medical equipment.

Working Principle

The 4N26SM optoisolator consists of an LED (light-emitting diode) and a phototransistor (light-dependent resistor) in one package. When a small current is applied to the LED, it emits light that is received by the phototransistor. This, in turn, causes the current to be amplified, which can then used to control the output of the device.

On the other hand, the device’s electrical isolation prevents any electrical leakage or interference between the input and output circuits. This allows signals to travel freely between the two circuits, while also providing an effective current barrier and protection against electric shocks.

Conclusion

The 4N26SM optoisolator is an ideal solution for applications that require a very reliable and secure electrical isolation power. It offers precise optical parameters, a wide operating voltage range, and increased safety through its electrical isolation. With its UL-certified applications and compact DIP packaging, the 4N26SM is well suited for a wide range of commercial, industrial, and medical uses.

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