PC817 OPTOCOUPLER PDF

PC is an optoisolator consists of an infrared diode and phototransistor. In electric circuits, we use mostly filters to remove noise. The circuit based on the capacitor and resistor always removes the noise from the incoming signal but the value capacitor and resistor always depend on the incoming signal. This circuit is only applicable where the incoming signal has some information or data but when we just need to forward the signal from one part of the circuit to the other part but signal contains noise, then we could use the combination of IR sender and receive. In PC photoisolator IC circuit , the IR receives the noisy signal as a power from the one circuit and passes it to the other part through the IR signal.

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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.

They work by blocking any electrical spikes that might otherwise find their way back down the line to the uC. Inserting one of these in line with a uC pin will help to protect that pin, but in order to fully isolate two parts of a circuit, it also requires that separate power systems be used on the two sides of the circuit so that there are no electrical sneak paths back through the power system.

This is typically over-kill for most hobby applications, but something to consider when full isolation is desired. Internally, the device has an IR LED on one side and a phototransistor on the other side of the device. Driving the LED causes the base of the phototransistor to also be driven, thus turning on the phototransistor.

When hooking up the device, two resistors are required to provide current limiting on the two sides of the device to prevent damage. The absolute maximum current through this LED is 50ma, but in practice the current should be limited to no more than 20mA for safe use with a uC.

A resistor value of ohms which gives a current of 10ma will work for most applications as a staring point. The second resistor is similarly used to limit the current flow through the phototransistor.

The max current is again 50ma, but it is typically operated at a lower current. Depending on what the optocoupler is being used to interface to, typically either a pull-up resistor is used that connects between the collector of the optocoupler and the power Vcc that is being used on the output side of the circuit or a series resistor is used that is connected between the emitter and the base of a transistor if a transistor is being used on the output.

A ohm resistor can usually be used as a starting point for this resistor as well. These devices can be very useful for adding a level of protection when a uC needs to interface with scary type circuits or when long cables are involved that may pick-up electrical spikes.

The circuit below is useless, but it demonstrates the basic operation of the device. Only logged in customers who have purchased this product may leave a review. The 1N small signal diodes are general purpose fast switching diodes used for small signal rectification. Description Reviews 0 Description The PC Optocoupler is used to provide electrical isolation of a signal between 2 circuits by using an optical bridge. Current Limiting Resistors When hooking up the device, two resistors are required to provide current limiting on the two sides of the device to prevent damage.

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PC817 Optocoupler Pinout, Datasheet, Equivalent, Features & Other Details

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.

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PC817 Optocoupler

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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