How Optocouplers work - opto-isolator solid state relays phototransistor
OPTOISOLATOR 5KV TRANS 4DIP
PC817 Series contains an IRED optically coupled to a phototransistor. This article is going to talk about more detailed information about PC817.
HomeCommunitySubjectPC817 Optoisolators Transistor Photovoltaic 4DIP[Video]: Pinout, Datasheet, and Equivalents
PC817 Optoisolators Transistor Photovoltaic 4DIP[Video]: Pinout, Datasheet, and Equivalents
OPTOISOLATOR 5KV TRANS 4DIP PC817 Series contains an IRED optically coupled to a phototransistor. This article is going to talk about more detailed information about PC817.
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Mar 8, 2022
Myra Stella
PC817X
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PC817 Description
PC817 Optocoupler also called photocouplers & optoisolators, 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.
It consists of Infrared Emitting Diode (IRED). This IRED is coupled to a photo transistor optically and not electrically. It is closed in a four (4) pin package. This package is usually available in two different forms.
The first one is wide lead (Pb) spacing option and the second one is SMT gullwing lead form option. PC817 has an internal LED and a photo transistor. The photo transistor's base becomes activate when LED throws light on it. The output obtained can be divided into two formats either common emitter or common collector. But the configuration is mostly common emitter. If the LED does not glow, transistor remains off and hence there will b no output generated by the optocoupler i.e. PC817.
PC817 is a commonly used Optocoupler, it contains one IR LED and one phototransistor in its package. Its working is easy, when a user to apply voltage to the IR LED which is connected to pin 1 and 2 the LED becomes activated and the light is received by the inter phototransistor, therefore, manufacture it in a saturation state due to which it connects the pin 3 and 4 with each other.
PC817 Pinout
PC817 CAD Model
Footprint
PC817 Features
★Input Diode Forward Voltage: 1.25V
★Maximum Collector-Emitter Voltage: 80V
★ Maximum Collector Current(IC): 50mA
★ Cut-off frequency: 80 kHz
★ Rise Time: 18us
★ Fall Time: 18us
★ Package-Type: 4 Pin Dip through hole and SMT
★ Transistor Types of NPN
★ 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
★ Double transfer mold package (Ideal for Flow Soldering)
Specifications
Sharp Microelectronics PC817X technical specifications, attributes, parameters and parts with similar specifications to Sharp Microelectronics PC817X.
PC817X Tech Specifications
PC817X Tech Specifications
Sharp Microelectronics PC817X technical specifications, attributes, parameters and parts with similar specifications to Sharp Microelectronics PC817X.
| Product Attribute | Attribute Value | |
|---|---|---|
| Mount | Through Hole | |
| Mounting Type | Through Hole | |
| Package / Case | 4-DIP (0.300, 7.62mm) | |
| Number of Pins | 4Pins | |
| Collector-Emitter Breakdown Voltage | 35V | |
| Collector-Emitter Saturation Voltage | 200mV | |
| Current Transfer Ratio-Min | 50% @ 5mA | |
| Number of Elements | 1 Element | |
| Operating Temperature | -30°C~100°C | |
| Packaging | Tube | |
| Published | 2003 | |
| JESD-609 Code | e0 | |
| Part Status | Obsolete |
| Product Attribute | Attribute Value | |
|---|---|---|
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | |
| Terminal Finish | Tin/Lead (Sn/Pb) | |
| Max Power Dissipation | 200mW | |
| Approval Agency | UL | |
| Voltage - Isolation | 5000Vrms | |
| Output Voltage | 80V | |
| Output Type | Transistor | |
| Configuration | SINGLE | |
| Power Dissipation | 200mW | |
| Voltage - Forward (Vf) (Typ) | 1.2V | |
| Input Type | DC | |
| Forward Current | 50mA | |
| Output Current per Channel | 50mA |
| Product Attribute | Attribute Value | |
|---|---|---|
| Rise Time | 18μs | |
| Fall Time (Typ) | 18 μs | |
| Collector Emitter Voltage (VCEO) | 80V | |
| Max Collector Current | 50mA | |
| Rise / Fall Time (Typ) | 4μs 3μs | |
| Reverse Breakdown Voltage | 6V | |
| Max Input Current | 50mA | |
| Max Breakdown Voltage | 35V | |
| Current Transfer Ratio (Max) | 600% @ 5mA | |
| REACH SVHC | Yes | |
| Radiation Hardening | No | |
| RoHS Status | Non-RoHS Compliant | |
| Lead Free | Contains Lead |
Where to use PC817?
PC817 Photocoupler has a transistor which is controlled based on light (photon). So this IC basically has an IR (infrared) LED and a photo-transistor inside it. When the IR LED is powered the light from it falls on the transistor and it conducts. The arrangement and pinouts of the IR LED and the photo-transistor is shown below.
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. 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. 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.
How to use PC817?
Using the PC817 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. 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 Emitter (pin 4) is grounded.
PC817 Applications
★ Noise coupling circuits
★ Ac/DC Power control
★ I/O switching for MCUs (Micro Controller Units)
★ Noise suppression in switching circuits
★ Signal transmission between circuits of different potentials and impedances
★ 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
PC817 Package
PC817 Manufacturer
Sharp Microelectronics of the Americas (SMA) drives innovative LCD, optoelectronics, memory, imager, and RF components to market. The world's leading manufacturers of consumer and business technologies look to SMA for the products, expertise, and worldwide support they need to make their visions a reality. SMA, in Camas, Washington, is the microelectronics sales and marketing division of Sharp Electronics Corporation, a wholly owned subsidiary of Sharp Corporation.
Datasheet PDF
Download datasheets and manufacturer documentation for Sharp Microelectronics PC817X.
PC817X Documents
PC817X Documents
Download datasheets and manufacturer documentation for PC817X
Datasheets
PC817X Series
Frequently Asked Questions
What is PC817?
Optocoupler / optoisolator is another name for PC817. It is made up of an Infrared Emitting Diode (IRED). This IRED is optically connected to a phototransistor rather than electrically. It's packaged in four-pin packaging. This package is usually offered in two variations.
Why is Optocoupler Used?
An Optocoupler may effectively remove electrical noise from signals when utilized correctly. Low-voltage devices should be kept separate from high-voltage circuits. Allows you to regulate bigger AC voltages with little digital signals.
How Does PC817 Work?
The IR receives the noisy signal as power from one circuit and sends it to the other component through the IR signal in the PC817 photoisolator IC circuit. The other component receives the signal and then executes the circuit design.
What is difference between optocoupler and opto isolator
While optocouplers have the advantage of intrinsic external field immunity, the CMOS digital isolator has nearly similar field rejection due to the close matching of signal levels on each side of the internal differential signal route and good receiver selectivity.
What is the function of opto-isolator?
An optoisolator is an electronics device that provides electrical isolation between two circuits while transferring electrical energy from one circuit to another using a brief optical transmission route.
FAQ
What is PC817?
Optocoupler / optoisolator is another name for PC817. It is made up of an Infrared Emitting Diode (IRED). This IRED is optically connected to a phototransistor rather than electrically. It's packaged in four-pin packaging. This package is usually offered in two variations.
Why is Optocoupler Used?
An Optocoupler may effectively remove electrical noise from signals when utilized correctly. Low-voltage devices should be kept separate from high-voltage circuits. Allows you to regulate bigger AC voltages with little digital signals.
How Does PC817 Work?
The IR receives the noisy signal as power from one circuit and sends it to the other component through the IR signal in the PC817 photoisolator IC circuit. The other component receives the signal and then executes the circuit design.
What is difference between optocoupler and opto isolator
While optocouplers have the advantage of intrinsic external field immunity, the CMOS digital isolator has nearly similar field rejection due to the close matching of signal levels on each side of the internal differential signal route and good receiver selectivity.
What is the function of opto-isolator?
An optoisolator is an electronics device that provides electrical isolation between two circuits while transferring electrical energy from one circuit to another using a brief optical transmission route.
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