MCT2 and MCT2E are also available in white package by . MCT2E. MCT2E-M. MCT V. (IC = 16 mA, IF = 32 mA, TA = °C). Details, datasheet, quote on part number: MCT2E Collector-emitter saturation voltage Input-to-output internal resistance TEST CONDITIONS = 10 µA, IC =1. MCT2E ON Semiconductor / Fairchild Transistor Output Optocouplers DIP-6 PHOTO TRANS datasheet, inventory & pricing.

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Connected to isolated ground.

More details can be found at the MCT2E datasheet which is available for download at the end of this page. When the IR led is powered the light from it falls on the transistor and it conducts.

There pull-up resistor 1K acts as a load resistor.

MCT2E Datasheet, PDF – Alldatasheet

But when the Logic input is made high, this high voltage should be a minimum of 1. Then Pull datasheet the collector pin of the transistor using a resistor here I have used 1K and connect the collector pin to the output of your desired logic circuit. This is where the isolation occurs.


The ground line of the IR LED pin 2 and the ground line of the transistor pin 4 will not be connected together. This is the logic output pin 6 Base B Base pin of the Transistor.

The below waveform shows the time taken for the output to transit from one state to another. In the Photo-transistor mode we will not be using the base pin pin 6 of the transistor; we just have to connect the anode pin of the IR LED pin 1 to the logic input which has to be isolated and the cathode pin 2 of the IR led to the ground.

This will short the collector and emitter and hence the Logic Output voltage will become zero.

This IC is used to provide electrical isolation between two circuits, one part of the circuit is connected to the IR LED and the other to Photo-transistor. Base pin of the Transistor.

IC MCT2E Optocouplers

The Emitter pin 4 is grounded. The complete working can also be understood form mcy2e GIF file above. Submitted by admin on 7 March The output will not get high as soon as the input logic is made low and vice versa. Out of which the Phototransistor mode is mostly used, so let us look at that mode first.


This comes in very handy when you are trying to isolate a noisy signal from your digital electronics, so if you are looking for an IC to provide optical isolation in your circuit design then this IC might be the right choice for you. TL — Programmable Reference Voltage. It is normally not used for transistor mode, but will be used in diode mode.

MCT2E Datasheet(PDF) – TI store

Another important parameter to consider while using an Optocoupler, is the rise time tr and fall time tf. The digital signal given to the IR LED will be reflected on the transistor but there will be no hard electrical connection between the two. This way the logic input will be reflected at the logic output and still provides and isolation between the two.