Optocoupler, Phototransistor Output, with Base Connection. DESCRIPTION. This datasheet presents five families of Vishay industry standard. DataSheet: PDF icon 4Npdf. 4N35 is an optocoupler integrated circuit in which an infrared emitter diode drives a phototransistor. They are also known as . The 4N35, 4N36 and 4N37 devices consist of a gallium arsenide infrared Refer to Quality and Reliability Section in Opto Data Book for information on test.

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For example one circuit could be the one powered by Arduino: Could you please explain to me why? This is the circuit:. Thanks for this simple explanation, very useful for a beginner like me. Only the transistor let them interact.

Optocoupler4N35 \ Learning \ Wiring

Hi I have read that in nuclear industries, optical isolators should be used for acheiving independence i. So, it basically do the same of the transistor example above but this time we are using an optocoupler. But we can understand how diodes works with it.

This is preferable against the one explained before because it won’t float when the microcontroller is shut off or when it is not actively drive the pins.

They are two indipendent circuit. Now that we know the theory behind optocouplers and that we know how to connect our 4N35 Optocoupler opticoupler now time to create a simple circuit with it.

We will use a transistor controlled by the Arduino board to act as a switch on an external circuit.


The fixed circuit in this section, by using a pull-down resistor doesn’t show this effect and works reliably. Hi I have read that in Submitted by Anonymous not verified on Tue, I saw schematics using both relay and transistor The circuit above once created using the Arduino board will looks like: If we dxtasheet the diode as seen on the pictures above when we’ll push the button the LED will turn on.

Probably related to power necessary. As you can see each time the output on pin 2 is HIGH our transistor will get a voltage on its base connector resulting in the collector and the emittor getting connected.


4N35 Optcoupler | 4N35 Datasheet

This confirms the behaviour of a diode: I suppose in this case, optocoupldr optical isolator would prevent surges and other damaging events from passing to the parts that work well, while a resistor would let it pass right on through.

In normal state the collector and emitter are disconnected but, when a current is applied to the base connector, the transistor change its state and the collector and emitter get connected thus current can flows between them. Search Search this site: We already know these terms from the transistor introduction above.

Improvement The circuit above can be improved by using this circuit: But i’m a bit perplex when i’ll have to choose between the last 2 techniques transistor, opto and rely could be added Note that the circuit coming from Vin 9V is actually completely separated from the one coming from the Arduino board.


An optical isolator on opocoupler other hand works opttocoupler to a diode in that it only lets unidirectional transmission. Popular content All time: We then have leg 4, 5, 6 respecly emitter, collector and base. Conclusions Now, I know how to use three new electronic components: Once assembled on the Arduino board, the circuit will looks like: You can download the video from http: An Arduino based circuit using an 4N35 Optocoupler Now that we know the theory behind optocouplers and that we know how to connect our 4N35 Optocoupler it’s now time to create a simple circuit with it.

You can see a demo in the video below. Once plugged into the Arduino board it will looks like: Well, nothing complex or useful actually. So, we have leg 1 and 2 near the printed dot on the chip that’s visible on it if we look carefully that acts respectly as anode and cathode.

IC 4N35 Optocoupler

Connecting the two circuits could be painful but with the transistor we could drive the second circuit by changing the state of the transistor trough the first circuit connected to the Arduino. I do not understand what is the difference and when it’s better to choose a transistor, an opto or a relay.

Thank you for the datashet article!

Good article Submitted by AN not verified on Sun,