{"id":90717,"date":"2024-10-07T09:00:36","date_gmt":"2024-10-07T07:00:36","guid":{"rendered":"https:\/\/botland.com.pl\/blog\/pc817-what-is-it-and-what-is-it-used-for\/"},"modified":"2026-04-08T10:48:21","modified_gmt":"2026-04-08T08:48:21","slug":"pc817-what-is-it-and-what-is-it-used-for","status":"publish","type":"post","link":"https:\/\/botland.store\/blog\/pc817-what-is-it-and-what-is-it-used-for\/","title":{"rendered":"PC817 – What is it and what is it used for?"},"content":{"rendered":"Reading time:<\/span> 4<\/span> min.<\/span><\/span>\t\t
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When designing electronic circuits, it may happen that due to the specific operating conditions of the circuit, it is necessary to provide galvanic separation<\/strong> between one circuit and another.
\nSuch a procedure is performed so that, on the one hand, there is the possibility of communication between them, and on the other hand – so that this is done safely, without fear of damage.
\nThis is especially useful when it is necessary to drive a circuit operating at a much higher voltage than the control circuit.
\n Optocouplers, also known as optoisolators, are<\/strong> used for this purpose.
\nAn example of a popular optoisolator, is the PC817<\/strong> IC, which we will present in this article. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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PC817 - general characteristics of the circuit<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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PC817<\/a> is an optoisolator consisting of an infrared diode and a phototransistor<\/strong>.
\nIn electrical circuits, we mainly use filters to remove noise.
\nA circuit based on a capacitor and resistor always removes noise from the incoming signal, but the value of the capacitor and resistor always depends on the frequency of the incoming signal.
\nThis circuit is only applicable when the incoming signal contains some information or data, but when we simply need to pass a signal from one part of the circuit to another, but the signal contains noise, then we can use a combination of an infrared transmitter and receiver. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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PC817 single channel optocoupler - THT - 10 pcs.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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In the PC817 optoisolator<\/a> IC, an IR diode receives a noisy signal from one circuit and passes it to the other part of the circuit via a signal from the frequency contained in the infrared band.
\nThe second part of the circuit receives the signal and then operates according to the design of the downstream part of the target circuit. <\/p>\n

The PC817 optocoupler has a small footprint and is available in a variety of housings for<\/strong> both THT and SMD mounting<\/strong>.
\nThe circuit can be directly connected to any low-voltage DC device or microcontroller.
\nThe input voltages will have the same effect on each side of the optocoupler, passing the signal to the receiver, and then the receiver will pass the logic signal as the output signal.
\nThe optocoupler has many applications due to its small and compact size as a control element<\/strong>. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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PC817 - pinout description<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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ANODE<\/span><\/p>\n<\/td>\n

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PIN 1<\/p>\n<\/td>\n

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Anode of the infrared diode (transmitter side).
\nThis lead is used to transmit the logic signal to the infrared receiver. <\/p>\n<\/td>\n<\/tr>\n

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CATHODE<\/span><\/p>\n<\/td>\n

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PIN 2<\/p>\n<\/td>\n

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Infrared diode cathode.
\nThis lead is the power ground of the circuit on the transmitter side. <\/p>\n<\/td>\n<\/tr>\n

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COLLECTOR<\/span><\/p>\n<\/td>\n

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PIN 3<\/p>\n<\/td>\n

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Collector – the output of the photoresistor (receiver side).<\/p>\n<\/td>\n<\/tr>\n

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EMITTER<\/span><\/p>\n<\/td>\n

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PIN 4<\/p>\n<\/td>\n

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Emitter of the photoresistor (receiver side) – this lead is the ground of the power supply on the receiver side.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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PC817 - replacements and other variants<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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There are several variations of the PC817 IC, viz.
\nPC817A, PC817B, PC817C and PC817D.
\nSubstitutes for the PC817 chip with similar parameters include.
\n4N25, 6N136, MOC3021<\/a>, MOC3041<\/a>, as well as 6N137. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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PC817 - practical applications of the optocoupler<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The optocoupler<\/a> has many applications, but due to the development of the IOT industry since 2012, the optocoupler is now increasingly used in everyday life to control various IoT devices<\/strong>, especially in home automation or controlling large electrical loads in industry.
\nThe optocoupler makes it possible to build a zero-crossing detector<\/strong> – thus, you get a change in the AC voltage frequency signal.
\nChanging the voltage gives you the ability to control the AC current.
\nThe AC load is additionally controlled by triacs<\/a>.
\nThe main feature of the optocoupler here is the change of the pulse frequency.
\nThe optocoupler is connected to the rectifier by a HIGH resistance in watts, and the rectifier converts the HIGH AC current to HIGH DC current, and the resistance reduces the DC voltage.
\nThe DC voltages coming out of the resistance are lower, but contain noise, which is not usable as a signal.
\nWe use an optocoupler to convert it into a proper signal<\/strong>.
\nThe optocoupler generates the same type of single pulse, no matter how noisy the signal is.
\nThis single pulse is used to detect frequency change events called zero transitions.
\nThis zero crossing allows microcontrollers to control a HIGH AC load with a simple microcontroller. <\/p>\n

The PC817<\/a> has an internal form of protection in the form of galvanic isolation<\/strong>.
\nThe protection applies to both the input and output.
\nThe optocoupler’s insulation is designed for a breakdown voltage of 5kV.
\nThe optocoupler can be used with an external resistor<\/strong> in high-voltage devices to work with low-voltage devices.
\nThe optocoupler can work with any device with internal interfaces<\/strong>, such as TTL device, microcontrollers, and even at HIGH DC voltage with some internal resistors.
\nThe PC817 optocoupler is equipped with internal reverse current protection.
\nDue to the unidirectional nature of IR current flow, the PC817 protects the IR from reverse current. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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PC817 optocoupler - parameters<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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  • Maximum collector-emitter voltage: 80V<\/li>\n
  • Maximum collector current: 50mA<\/li>\n
  • Limit frequency: 80 kHz<\/li>\n
  • Propagation time: 18us<\/li>\n
  • Maximum operating temperature: -30*C – +100*C.<\/li>\n
  • Maximum soldering temperature: 260*C<\/li>\n
  • Storage temperature: -55*C – 125*C<\/li>\n
  • Maximum power dissipated: 200mW<\/li>\n
  • Internal resistance: 100R<\/li>\n<\/ul>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    PC817 - applications in electronics<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    The PC817 optocoupler has a very wide range of applications<\/strong>.
    \nAmong other things, it can be used in protection<\/strong> such as electrical isolation between the control stage and the power stage in frequency converters.
    \nThe PC817 is a very efficient circuit when controlled from microcontrollers<\/strong>.
    \nSimple transistors can be used in<\/strong> addition, but because of the omitted noise factor, the optocoupler can also be used as a switch in high-frequency circuits<\/strong> such as frequency converters and other power electronics. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

    Galvanic isolation in multi-voltage circuits is sometimes indispensable – learn the secrets about the PC817 optocoupler IC!<\/p>\n","protected":false},"author":22,"featured_media":90711,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7,179],"tags":[],"class_list":["post-90717","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-elektronika","category-kompendium"],"acf":[],"yoast_head":"\nPC817 - What is it and what is it used for? - Botland<\/title>\n<meta name=\"description\" content=\"Galvanic isolation in multi-voltage circuits is sometimes indispensable - visit Botland's blog to learn the ins and outs of the PC817 optocoupler IC!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/botland.store\/blog\/pc817-what-is-it-and-what-is-it-used-for\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PC817 - What is it and what is it used for? 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