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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More details can be found at the PC datasheet which is available for download at the end of this page. First of all thanks for sharing such an useful information.

Another important parameter to consider while using an Optocoupleris the rise time t r and fall time t f. It depends on the 2nd circuit you are supplying the voltage on collector of the optocoupler, optocoupler will never transfer the voltages of circuit1 to circuit2, it decreases resistance between your supplied voltages at collector and emitter on the input of circuit2.

For response time or frequency response data, check the datasheet. Mihai on March 6, at 2: I was referring to the junction resistance. Thx and best regards, Geert. Mihai on February 6, at Shahid on August 7, at 1: Michael on January 21, at 3: Mohamed on October 9, at 9: I like the way you explain things.

Leave a Reply Cancel reply Your email address will not be published. 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. There is no law governing all things.


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. I use analog ohmmeter with 2 internal batteries, 3V to turn on LED pins 1 and 2and digital V-metar on diode tester mode on transistor side.

Any help would be apreciated. Sunil on March 3, at 3: I was wondering if i could just bypass the optcoupler and see if it works. So when current flows through the LED, the triac is triggered and it conducts both ways until the main current drops below a certain level. But when the Logic input is made high, this high voltage should be a minimum of 1. Ado on November 14, at The Emitter pin 4 is grounded. Here I want to show you how to check if an optocoupler is working. If i give the input of V DC what will be the response of this optocoupler….

Sanu sebastian on August 19, at 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.

Mihai on November 20, daasheet 1: If the input is at 2V DC, then the output resistance should be around — ohms. The question is which one is the right testing method?

How to test an optocoupler – AntiMath

Arvind Vijaykumar on June 1, at The LED is basically a diode, and it should not conduct both ways not get values on the meter both ways. Some features may not work properly. An optocoupler or optoisolatoris a device that contains a light-emitting diode LED and a photosensor photodetector, such as a photoresistor, a photodiode, a phototransistor, …etc.


You have JavaScript disabled or are viewing the site on a device that does no support JavaScript. This comes in very handy when you are trying to isolate a noisy signal from your digital electronics, datasbeet 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.

Thank you for the information… dtaasheet i have one more clarifications. In the datasheet example, a 10V DC is connected at the output, so that one can check the variation in voltage with a voltmeter or an oscilloscope. Hi, Both methods are correct. Thanks for the easy to follow explanation of how to rest an optocoupler.

PC817 (EL817)

Mihai on August 27, at Good design is as little design as possible. The digital signal given to the IR LED will be reflected on the transistor but there will be no hard electrical opptocoupler between dattasheet two. The purpose of an optocoupler is to transfer signals from one circuit to another yet keep them galvanically isolated. Mihai on October 28, at In my example an ohmmeter is connected at the output, in order to see the change in resistance.