Photocoupler s Features. 1. Current transfer ratio PC Anode mark. PC Internal connection diagram. PC PC PC PC PC PC 1. Notice The content of data sheet is subject to change without prior notice. In the absence PCXNNSZ0F Series contains an IRED optically Photocoupler. Dual-in-line package: LTV 1-channel type. LTV 2-channel type. LTV- 4-channel type. * Wide lead spacing package: LTVM: 1-channel type.

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How to test an optocoupler – AntiMath

For the triac pins 4 and 6with no voltage applied to the LED pins 1, 2check with an datsaheet the resistance between pins 4 and 6, it should be high open otocoupler or at least greater than 1 megohm both ways, and this resistance should go down lower than ohms when voltage is applied to the LED, and should remain low even if the voltage is no longer present optocopuler the LED.

Mihai on July 19, at 3: Mihai on August 27, at You have JavaScript disabled or are viewing the site on a device that does no support JavaScript. The output will not get high as soon as the input logic is made low and vice versa.

Shahid on August 7, at 1: Good design is as little design as possible.

Mihai on July 15, at 8: Evis on November 12, at 7: The below waveform shows opocoupler time taken for the output to transit from one state to another. Hi, The MOC, is a phototriac coupler, meaning that instead of the phototransistor, it has a phototriac, which is basically a triac with the gate driven by the LED. Wade on February 5, at 9: These information are very good indeed.


There is no law governing all things. I use optocooupler ohmmeter with 2 internal batteries, 3V to turn on LED pins 1 and 2and digital V-metar on diode tester mode on transistor side.

I like the way you explain things. Mihai on November 20, at 1: Sarfaraz on November 8, at 9: Please correct the pin numbers in image. If the input is at 2V DC, then the output resistance should be around — ohms. The firehose by day and forty beers by night, An engineer may never sleep and still be just as bright. Sunil on March 3, at 3: What if there is photo-Triac instead of Photo-transistor, How to test then? Thanks for the easy to follow explanation of how to rest an optocoupler.

How the optocoupler Type SFH acts when the positive line is open. There pull-up resistor 1K acts as a load resistor.

PC817 (EL817)

Michael on January 21, at 3: Step 2 If the LED is good then we should check the phototransistor, you could measure it with the ohmmeter just like the LED between pins 3 and 4 the emitter and collectorand you should get a high resistance value both ways if the phototransistor is good.


I appriciate… I tried that emprical method for H11B1 optocoupler. Hi, First of all thanks for sharing such an useful information.

Nupra on March 18, at 6: 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 optocoupler is Optocoulper C F, should i just join the emittor and collector pins? More details can be found at the PC datasheet which is available for download at the end of this page.

With no voltage applied to the LED pins 1 and 2and with an open base pin 6there should be a high resistance between pins 5 and 4.

Mihai on February 2, at 5: Your email address will not be published.

Any help would be apreciated. Did you reffer to isolation resistance when you mention some phototransistors have high resistance? Mihai on September 17, at Connected to Ground 4 Collector Collector pin of the Optofoupler. When Firefox stops working, you fire up Chrome. In my example an ohmmeter is connected at the output, in order to see the change in resistance.