PC817 OPTOCOUPLER PDF

Its working is simple, when a used apply voltage to the IR LED which is connected on pin 1 and 2 the LED become activated and the light is received by the internal phototransistor hence making it in saturation state due to which it connects the pin 3 and 4 with each other. PC is a widely used optcoupler and works well in electronic circuit for a single isolation task. If you require more isolation tasks at the same time then you can also use other optocouplers that contains couple of IR LEDS and phototransistors in a single package. If you are going to design an electronic circuit in which there is a chance of voltage spikes or voltage surge which may weak or destroy the components or the circuit then you can use the PC optocoupler to isolate the circuit. Moreover it can also be used to remove noise from an electronic signal, isolate DC and low voltage circuits from AC and high voltage circuits. You can also use it where you want to control larger voltage or AC voltage from small any small signal which can be a digital signal or analog.

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Note: More details can be found at the PC datasheet which is available for download at the end of this page. 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. 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 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.

Using the PC IC is pretty much straight forward, 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. Then Pull high 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. The Emitter pin 4 is grounded.

This is where the isolation occurs. There pull-up resistor 1K acts as a load resistor. But when the Logic input is made high, this high voltage should be a minimum of 1. This will short the collector and emitter and hence the Logic Output voltage will become zero. This way the logic input will be reflected at the logic output and still provides and isolation between the two. The complete working can also be understood form the GIF file above. Another important parameter to consider while using an Optocoupler , is the rise time t r and fall time t f.

The output will not get high as soon as the input logic is made low and vice versa. The below waveform shows the time taken for the output to transit from one state to another. Subscribe to stay updated with industry's latest Electronics components and news. Connected to ground 3 Emitter Emitter pin of transistor. Connected to Ground 4 Collector Collector pin of the Transistor. Component Datasheet. PC IC Datasheet. Tags Photo coupler. Get Our Weekly Newsletter!

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PC817 Optocoupler pinout, working and Example with Arduino

The PC Optocoupler is used to provide electrical isolation of a signal between 2 circuits by using an optical bridge. The device is uni-directional and can only pass a signal in one direction. Optocouplers are used to provide electrical isolation between two points in a circuit. Most often, they are used in a digital circuit to provide electrical isolation between a uC and a high energy output circuit such as a motor or to provide an additional layer of protection when using something like a relay to control a high energy device.

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PC817 Optocoupler

Note: More details can be found at the PC datasheet which is available for download at the end of this page. 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. 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 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. Using the PC IC is pretty much straight forward, 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.

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