PC817 Optocouplers also called photocouplers & optoisolators, are an IC kind of seeing tools available from 4 pins to many numbers of pins, they are commonly used for the separation of two circuits from each other. PC817 is a commonly used Optocoupler, it contains one IR LED and one phototransistor in its package. Its working is easy, when a user applies voltage to the IR LED which is connected to pins 1 and 2 the LED becomes activated and the light is received by the inter phototransistor, therefore, manufacturing it in a saturation state due to which it connects the pin 3 and 4 with each other.PC817 is an extensively used optocoupler and works well in an electronic circuit for a single task. If you need many isolation tasks at the same time then you can also use other optocouplers that contain a couple of IR LEDs and phototransistors in one package. The pin configuration of a PC817  optocoupler.

PC817 Optocoupler Pinout



PC817 optocoupler of Features

  • Package-Type: 4 Pin Dip and SMT
  • Transistor Types of NPN
  • Maximum Collector Current(IC): 50mA
  • Maximum Collector-Emitter Voltage (VCEO): 80V
  • Collector-Emitter Saturation Voltage: 0.1 to 0.2
  • Max Emitter-Collector Voltage (VEBO): 6Volt
  • Max Collector Dissipation (Pc): 200 MW
  • Maximum Storage and Operating temperature Should Be: -55 to +120 Centigrade for storage & -30 to +100 for operating

 The equivalent of PC817  Optocoupler:

The replacement and equivalent of PC817 optocoupler are SFH615,AK817P,PC816, LTV123,TLP621, TLP321, TLP421, PC17K1,SFH615A, LTV-610 K1010 PS2501-1, PS2561-1, PS2571-1, LTV-816, LTV-817(-V),  ,PC123,H11A817


Where TO Use PC817 Optocoupler:

If you are going to design an electronic circuit in which there is a chance of voltage spikes or voltage surges which may weaken or destroy the tools or the circuit then you can use the PC817 optocoupler to separate the circuit. furthermore., it can also be used to remove sound from an electronic signal, and separate DC, and low voltage circuits from AC and high voltage circuits you can too use it where you want to control larger voltage or AC voltage from small any small signal which can be a digital signal or same

How TO Use PC817 Optocoupler:

Using the PC817 optocoupler is very easy, there are four pins shown in the pinout details. Pin 1 is the anode or positive pin of the IR LED that should be coupled from the output signal of your circuit and pin 2 should be coupled to the earth. The other portion of the circuit which you want to separate or control should be connected with the pin3 Emitter and pin4 Collector. The pin3 and pin4 act the same as any other normal transistor for the ideal BJT transistor’s emitter and collector.


Applications of optocoupler:

  • Office and home appliances
  • Sensor Circuits
  • The output of Microcontrollers to control devices
  • Digital circuits
  • Power suppliers and chargers
  • Isolation between any type of two circuits

How we can Safe Long Run in a Circuit:

To carefully long run these tools in your circuit is recommended to always stay below the absolute max ratings. Do not drive load above 50mA, The iLED internal IR LED can be operated the same as you operate any other normal LED with a current limiting resistor so always use a current limiting resistor at the pin1 of the optocoupler. Do not drive the tool in temperatures below -30 centigrade and above 100 centigrade and always store it in temperatures above -55 centigrade and  under the 125 centigrade

optocoupler 817 working:


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