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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Mihai on March 6, at 2: Mihai on July 19, at 3: First of all thanks for optocoupller such an useful information. When Firefox stops working, you fire up Chrome. Sunil on March 3, at 3: I only have a digital multi meter. This is where the isolation occurs. I guess, it should work mostly the same as a normal triac. Better check the datasheet for a test circuit.

But when the Logic input is made high, this high voltage should be a minimum of 1. Mihai on October 28, at This site uses Akismet to reduce spam.

Mihai on June 10, at You have JavaScript disabled or are viewing the site on a device that does no support JavaScript. Mihai on July 15, at 8: The nice thing about standards is that you have so many to choose from. Kannan E on July 19, at 9: Ado on November 14, at Mihai on February 2, at 5: For the triac pins otocoupler and 6with no voltage applied to the LED pins 1, 2check with an ohmmeter the resistance between pins 4 and 6, it should be high open circuit 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 on the LED.


Another optocoupldr parameter to consider while using an Optocoupler optocouplwr, is the rise time t r and fall time t f. Siroos on October 14, at Hi, Both methods are correct.

PC817 (EL817)

How the optocoupler Type SFH acts when the positive line is open. Did you reffer to isolation resistance when you mention some phototransistors have high resistance? 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. Any help would be apreciated.

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. Some features may not work properly. Evis on November 12, at 7: The output will not get high as soon as the input logic is made low and vice versa. If you get a value either way or no value at all, then certainly there is a problem with the LED, and you should find another optocoupler.

Sanu sebastian on August 19, at Viliam on September 7, at 1: I appriciate… I tried that emprical method for H11B1 optocoupler. Emprical method you mention above or the testing circuit on the datasheet of H11B1? This way the logic input will be reflected at the logic output and still provides and isolation 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.


This will short the collector and emitter and hence the Logic Output voltage will become zero. I have two circuits. Thx and best regards, Geert.

PC IC Pinout, Features, Equivalent & Datasheet

There is no law governing all things. Good design is as little design as possible. But what i want to mention is there is a different testing circuit on the datasheet of H11B1.

I like the way you explain things. Mihai on March 18, at Arvind Vijaykumar on June 1, at 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.

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.

TL — Programmable Reference Voltage.

How to test an optocoupler – AntiMath

Mihai on July 16, at 5: Learn how your comment data is processed. The complete working can also be understood form the GIF file above. Pls let me know.