IS126

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Optoisolators-Transistor, Photovoltaic Output is a type of opto-isolator that is used in applications where signals need to be isolated from one another for safety or performance reasons. It typically consists of an infrared LED emitter and a phototransistor collector that are optically coupled together through an air gap. The phototransistor acts as a switch, which is only activated when the LED is energized. The purpose of this type of opto-isolator is to isolate signals or protect sensitive circuits from clean electrical noise.

IS126 optoisolators are used for low voltage applications, with some models capable of operating with the supply voltage as low as 1.8 volts. The devices have a wide range of voltage, current and power, with supply voltage range from 1.8 to 30 volts and current capability range from 1 to 80 μA. It has a low propagation delay time which is less than 100 ns. Some models of IS126 have an average collector gain as high as 200V/mV, which make them very suitable for controlling currents or for voltage amplification.

The wiring of the IS126 opto-isolator is straightforward and usually requires only the addition of two wires, one for the LED and one for the phototransistor. The LED should be connected to a current limiting resistor and the phototransistor should be connected across a resistor to ground. The IS126 signal transmission modes are normally open, normally closed and normally-off. In the normally open type, the LED is turned on when the LED input voltage is lower than the LED turn-on voltage. In the normally closed type, the LED is turned-on when the input voltage is higher than the LED turn-on voltage. The normally-off type is similar to the open type, however, it is the reverse where the LED is only turned on when the input is higher than the LED turn-off voltage.

The working principle behind the IS126 opto-isolator is relatively straightforward. When the LED turns on, the light emitted by the LED is reflected back and forth from the metal surface of the phototransistor, making it electrically activated. This electrical activation then causes the phototransistor collector to turn on and the current to pass through the LED from the input side, to the phototransistor and then to the output to the other side.

The IS126 opto-isolator is widely used in applications such as industrial controls, power supplies, consumer electronics, automotive, medical, aerospace and military systems. It is also used to isolate communications between different systems and provide optical isolation between high voltage and low voltage signals.

In conclusion, IS126 optoisolators – Transistor, Photovoltaic Output are reliable and efficient solutions for opto-isolating signals and protecting sensitive circuits from electrical noise. The wires of the IS126 device are easy to connect and the range of voltage and current are impressive. Furthermore, the low propagation delay time and the high collector gain make the device suitable for controlling currents and voltage amplification.

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