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Optokoppler PCB

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Advantages of Optocoupler

1.The optocoupler PCB works well on either AC or DC high-voltage signals.
2..It is also used in a number of sensor applications to sense the presence of physical objects.
3.The lifetime of optocouplers can exceed several decades.
4.It offers a very good response at lower frequencies. It works very fast.
5.No contact bounce, no interference caused by arcs, wear the circuitry.
6.It is compact and lightweight&It is cheap.
7.It has a high switching frequency due to short switch-on and switch-off times.

Advantages of Optocoupler
Disadvantages of Optocoupler

Disadvantages of Optocoupler

Following are the drawbacks of optocoupler:

1.Optocoupler needs external biasing voltage for its operation.
2.The High-frequency response is poor.
Optocoupler is not capable to handle high current.
3.Optocouplers using phototransistors do not have such as good a linear relationship between the changes in light input and output current as photodiode types.

What's the Optocoupler PCB

An optocoupler (optoelectronic coupler/optoisolator) is basically an interface between two circuits that operate at (usually) different voltage levels.

With an optocoupler, the only contact between the input and the output is a beam of light. Although optocoupler has many advantages, it has disadvantages too.

Optocoupler PCB

For more than 10 years, Venture is a trusted manufacturer of excellent quality optocoupler PCB. Venture is a famous Chinese supplier of optocoupler PCB that offers the best quality products and excellent services.

As a professional manufacturer, more than 500 companies have relied on us for optocoupler PCB needs. Make Venture as your best optocoupler PCB manufacturer and supplier now!

Your Leading Optocoupler PCB Supplier in China

If you are looking for high-quality optocoupler PCB solutions from China, you need not look further. You have come to the right place! Venture is more than 10 years in providing excellent quality optocoupler PCB to many industries.

Through the years, we can accommodate a huge optocoupler PCB range for your selection. We can manufacture different types of optocoupler PCB based on a competitive price.

As a leading manufacturer, we have an extensive network of subcontractors throughout China. Our team of in-house designers guarantees up-to-date optocoupler PCBs.

Furthermore, we can work with the buyer’s own designs. Just send us your detailed requirements and we will do the rest.

Venture optocoupler PCBs are electronic components that isolate input signals through an optical interface. They are an ideal choice for isolating embedded systems.

As an expert manufacturer, we manufacture the optocoupler PCB that protects the embedded system from electrical noise. Venture optocoupler PCB is designed to keep high and low voltage systems apart.

Additionally, optocoupler PCB is designed to eliminate the risk of circuitry faults that can cause damage to the microcontroller and its accompanying components.

Venture optocoupler PCB is fabricated for any precise functioning. We have a professional designer team who highly efficient when it comes to optocoupler PCB design and production.

Make Venture as your best supplier as we had passed a variety of certifications.

By providing excellent customer service, quality products, we became the most trusted manufacturer and supplier of quality optocoupler PCB.

If you rely on us, we guarantee competitive cost and flexible payment terms without minimum order required! We are your trustworthy optocoupler PCB manufacturer and supplier!

For more information about our optocoupler PCB, please don’t hesitate to contact our team now!

Optocoupler PCB: The Ultimate FAQ Guide


Before choosing an Optocoupler PCB, read this guide.

It answers all your questions on Optocoupler PCB, from design, specification, working principle, features, material type to possible configurations, amongst others.

So, if you want to learn more about Optocoupler PCBs, read this guide.

What Is An Optocoupler PCB?

This is a board with electronic parts that will act as interfaces between two circuits that have varying voltage levels.

Optokoppler PCBs supply electrical isolation between the output and the input sources.

4 channel optocoupler

4 Channel Optocoupler

What Are Some Design Mistakes With Optocoupler PCB?

Optocoupler PCBs are simple passive parts that several designers encounter.

Making an Optocoupler PCB to operate is not hard but some design flaws can cause it not to operate optimally.

Some of the design mistakes with Optocoupler PCBs include the following:

Not Separating Ground Connections For Optocoupler PCBs.

Basic Optocoupler PCBs have two ground pins on the integrated chip [IC].

One pin connects to the infrared light-emitting diode and the other pin connects to the phototransistor.

Connecting both the ground connectors on the Optocoupler PCB is a mistake.

Using an Optocoupler PCB ensures you safely separate two different circuits.

Connecting ground circuits on the Optocoupler PCB can cause ground noise within the circuitry.

This can happen to the couple on the delicate onboard circuit.

Therefore, you should form independent signal connections for the external ground pins.

Also, you should have connectors for all the input ground wires.

Current Limiting Resistor With A Wrong Value

Infrared LEDs in Optocoupler PCBs need suitable current to operate properly besides using the correct voltage output.

Phototransistors in Optocoupler PCBs can perform irregularly when the current limiting resistor operates at a minimal value.

Besides, the value of limiting resistors should not be very low as it inhibits infrared LEDs from breaking down.

Selecting the correct current limiting resistor is vital to ensure the Optocoupler PCB operates reliably.

Selecting A Wrong Optocoupler PCB

Not all Optocoupler PCBs are built the same.

For example, Opto-Triac controls AC load while opto-Darlington is useful in scenarios that generate small input current.

Why Do You Need To Use Optocoupler PCBs?

There are various scenarios where you need to electrically isolate two separate units.

Such situations include the following:

  • When you ground one side of a circuit and the other side is floating.
  • In situations where you need to separate high and low voltage circuits with safety and plausible failure
  • When the ground potential of sub circuits are separate
  • In low-voltage circuits, so that failure will not ripple to another device when one circuit fails
  • When you need to maintain suitable signal and cancel noise or common-code voltages in two sub circuits
  • In a unit that should measure voltage between independent batteries in a series connection
  • When power regulators need isolation between the primary and secondary sides and the primary side needs feedback from the output

What Are Some Alternatives To Optocoupler PCBs?

The alternatives to achieving galvanic isolation entail the following:

  • Magnetic isolation using transformers
  • Coupled coils
  • RF
  • Capacitive using integrated circuit fabrications

What Are Some Limitations To Optocoupler PCBs?

4 channel opto coupler pcb

4 channel opto coupler PCB

Optocoupler PCBs are active devices and the LEDs need the correct current that ranges between 20 mA to about 50 mA.

Besides, LED aging happens as LED output degrades with time, meaning it may reach half-power after 20 years.

This means the durability of Optocoupler PCBs may be minimal than how the application can tolerate.

Technological advancements have minimized aging and manufacturers guarantee usage for 20 years.

What Factors Do You Use When Assessing Optocoupler PCBs?

There are several factors that you can use, and the main ones include the following:

  • Isolation
  • Linearität
  • Geschwindigkeit
  • Current-transfer ratio [CTR]

How Much Isolation Does Optocoupler PCBs Offer?

Isolation varies from one Optocoupler PCB to another, and it is usually between >1000 V and >2000 V.

Besides, isolation is a function of physical input or output separation especially in the dimensions of clearance and creep age.

Also, the material you use is a function of isolation and various industries and regulatory standards like IEC 60601-01 or UL 1577.

Several applications require minimal isolation as others need tens of volts and others needing thousands of volts.

The regulatory standards that Optocoupler PCBs should comply with allow you to use them in safety-critical designs.

Such designs include separate low-voltage circuits and high-voltage circuit operations.

Why Is Current-Transfer Ratio Important In Optocoupler PCBs?

The Current-transfer ratio [CTR] will indicate the efficiency of an Optocoupler PCB.

If the current-transfer ratio is low, input sides require a more current drive to LEDs to form sufficient current at phototransistors for output loads.

A high current-transfer ratio will offer input or output margins as LEDs age with time.

Besides, the current transfer ratio will range from 50% to 400%.

The Current-transfer ratio is a function of input LED current in Optocoupler PCBs.

What Is Optocoupler PCB Linearity?

A phototransistor is a transistor that can support linear output and input transfer operations.

This is when you operate it in suitable linear ranges.

SSR Optocoupler PCB have designs and biases.

Linear optocoupler

linear Optocoupler

This makes them not to be non-linear and obtaining suitable linearity in Optocoupler PCBs is simple.

This makes them viable as feedback elements in the isolated power supply or voltage regular.

What Is The Speed And Response Time For Optocoupler PCBs?

Several applications are usually low bandwidth and speeds.

For instance, measuring voltage in batteries or separating grounds.

This makes speed not to be an issue when using Optocoupler PCBs.

However, you may require more speed when isolating digital-datalink signals depending on different specifics.

Besides, the speed will range from slow, to modest, to fast, and then to Ethernet within Optocoupler PCBs.

Can An Optocoupler PCB Work With AC Signals?

Full-wave rectifiers and simple filtering can drive LEDs of the Optocoupler PCBs with current scaling.

This is through basic resistors or current sources.

How Do Optocoupler PCBs Protect Circuits From High Voltage?

Optocoupler PCBs operates by rejecting EMF, electrical surges, and noise from penetrating MCU units.

Besides, Optocoupler PCBs will form safe connections between microcontrollers and high voltage devices.

This is through electrical insulation.

When a high voltage circuit causes electrical surges, the surge will remain in the output direction of the Optocoupler PCB.

Also, the input side of the circuit will remain safe since both ends have electrical isolation.

For instance, standard Optocoupler PCBs can support 5 kV of output and input isolation voltage.

Several electronic parts function below 10 V, and a lighting surge penetrates the unit, it may make the voltage surge to 10 V.

This kind of voltage is enough to damage the electronic parts immediately.

There are some commercial Optocoupler PCBs to resist 10 kV of input and output voltage isolation.

It protects them from lightning strikes.

Replacing electrical parts that are burnt in Optocoupler PCBs can be inconvenient.

However, Optocoupler PCBs can ensure you secure costly components.

When there is a malfunction, Optocoupler PCBs ensure the Optocoupler burns and the printed circuit board remains safe.

Besides, the Optocoupler PCBs are within integrated chip [IC] sockets meaning replacing them is quite easy.

Do Optocoupler PCBs Solve Impedance Matching?

Several communication circuits are vital in establishing matching impedance between many parts.

When there is a mismatch in the Optocoupler PCB, it will lead to an inappropriate output.

However, you can use Optocoupler PCBs in signal transmission without the need for impedance matching on either side.

This is the reason why Optocoupler PCBs are common in high-speed telecommunication devices.

4 channel opto coupler module

4 channel Optocoupler module

Can Optocoupler PCBs Sense Zero Crossing Of AC Sources?

For many applications, sensing zero-crossing of alternating current mains is vital.

For instance, power factor correction systems will measure the different angles between real power and reactive power.

Besides, real power and reactive power are both parts of total power.

Monitoring zero-crossing of the current and voltage wave.

It is a way of measuring differences between reactive power and real power.

Zero-crossing will denote the area where the waveform will cut across the axis coordinate.

Also, zero-crossing shows when waveforms, conveyed as mathematical functions, switch from negative to positive, and back.

Some frequency testing circuits operate by monitoring zero-crossing in AC waveform sources.

Optocoupler PCBs can detect zero-crossing of AC power mains as the response time is normally in nanoseconds.

It turns off and on rapidly at zero-crossings.

Applying filters and rectifiers on AC mains allow you to achieve digital signals from Optocoupler PCBs.

Also, you can vary the output waveform by using RC filters on the Optocoupler PCBs.

How Do You Switch Devices With Optocoupler PCBs?

An Optocoupler PCB assists in offering safe barriers between external parts and the digital output of microcontrollers.

The digital output of microcontrollers will initiate a DC signal that switches IRED in Optocoupler PCBs.

Microcontroller’s output pins and IRED within Optocoupler PCBs can support limited current flow.

It is worthy to apply current limiting resistors between the microcontroller’s output and Optocoupler PCB input.

When the IRED turns on, infrared light hits phototransistors, which will energize phototransistors.

Once this happens, the current begins to flow between emitter pins and collectors.

The collector and emitter of the phototransistor will support a small current flow.

Transistors can enhance Optocoupler PCB outputs when you need to control high current specifications in devices.

The ground of the switching devices will not connect to the ground circuit of the microcontroller.

This is because it can result in noise leakage moving towards microcontrollers on the Optocoupler PCBs.

How Do You Read Input Signals Using Optocoupler PCBs?

Optocoupler PCBs assist in safely reading levels from different sources.

For example, voltages from power supplies lacking transformers may have noise.

In this scenario, connecting input signals directly to microcontrollers can make noise from input signals.

This interferes with the operation of the microcontroller.

When you expose electrical surges to microcontrollers, it will burn.

When you use Optocoupler PCBs provide insurance between microcontrollers and input signals.

How Does An Optocoupler PCB Operate?

Single channel optocoupler PCB

Single channel Optocoupler PCB

When current passes through Optocoupler PCBs, it makes infrared light-emitting diodes.

Hence produces light proportional to the electric current you supply.

Input resistance at the start of the circuit decreases the current flowing via the LEDs when you increase its value.

As light hits the photosensitive equipment, it will switch on and begins conducting current, the same way a transistor operates.

Photosensitive devices are usually in a disconnected state to offer maximum sensitivity to infrared light.

Also, you can use an external resistor to connect it to the ground to offer a high level of control on the switching sensitivity.

An Optocoupler PCB operates like a switch and will connect two independent circuits on the board.

Photosensitive devices will turn off as it stops conducting current when the flow of current via the LED stops.

Besides, the switching mechanisms occur via a void of air, glass, or plastic without electrical components between photosensitive devices.

What Are The Applications Of Optocoupler PCBs?

Optocoupler PCBs can operate independently as switching devices or with other electronic equipment.

Helps to offer isolation between high and low voltage circuits.

Here are some applications for Optocoupler PCBs:

  • Isolation of two different electrical circuits
  • Halbleiterrelais
  • Ground isolation
  • Lamp dimmer circuits
  • High voltage monitoring and sensing units
  • Motor control units
  • Lightning control circuits
  • Direct current converter circuits
  • Switch-mode power supply [SMPS]
  • Controlling Triacs and transistors
  • DC and AC power control
  • PC communications
  • Microprocessor input and output switching
  • Communication device protection
  • Power supply regulation

What Are Some Configurations Of Optocoupler PCBs?

Since there are various applications of Optocoupler PCBs, you will have various configurations.

Dazu gehören folgende:

  • Opto Transistor DC Switch
    In this configuration, it detects DC signals and enables you to control AC-powered devices.
    For instance, some will control mains connection or offer gate pulses to other photo-Triac using current limiting resistors.
  • Triac Optocoupler
    This configuration enables you to control AC-powered loads like lamps and motors.
    Besides, it can conduct both halves of AC cycles and detect zero-crossing.
    This feature enables the load to have full power without the current spiking as you switch inductive loads.

What Are The Benefits Of Optocoupler PCBs?

It is important to protect low-voltage equipment.

If the electronic device will experience lightning strikes, voltage surges, supply spikes, and so on.

The Optocoupler PCB will assist you to effectively:

  • Eliminate electrical noise from various signals
  • Separate low-voltage equipment from high-voltage circuitry
  • Enable you to use small digital signals to monitor high AC voltages

What Is The Internal Structure Of An Optocoupler PCB?

An Optocoupler PCB contains infrared light-emitting diodes [LED] and photosensitive devices.

Both of these features will detect infrared beam when it is emitted.

Besides, semiconductor photosensitive devices can be:

  • Fototransistoren
  • Fotodioden
  • Darlington pair
  • SCR

Also, light-sensitive devices and infrared LED are within a single package with the LED on the input side.

Also light-sensitive medium on the output side.

In addition, you will connect resistance at the start of the circuit to limit the current.

The other resistance connects between the collector terminals and the supply voltage.

What Are The Types Of Optocoupler PCBs?

The type of detector that you use will determine the type of Optocoupler PCB.

There are Optocoupler PCBs that have varying traits making them suitable for certain applications.

Besides, Optocoupler PCBs are referred by the type of output.

Diese umfassen:

  • Photocell Optocoupler PCB
    The earliest Optocoupler PCBs are photocell Optocouplers, also referred to as resistive opto-isolator PCBs.

The light source they use can be:

  1. Glühlampen
  2. Light-emitting diodes, or
  3. Neonlampen.

Besides, the detector these PCBs uses are:

  1. Cadmium sulfide [CS] or
  2. Cadmium selenide (CSe) photoresistor

Photocell Optocoupler PCBs are not obsolete.

This is because, they are slow at switching, averaging between 5 milliseconds and 200 milliseconds.

In the past, they were used in photocopiers, telephone networks, and industrial automation industries.

Besides, they are unique since they are not polarized hence suitable for AC and DC operations.

Some niche products such as electronic musical instruments and guitar amplifiers still make use of this

Optocoupler PCBs.

Vactrols are also known as resistive LED opto-isolator PCB.

  • Photodiode Optocoupler PCB
    These Optocoupler PCBs use LED as the light source and photodiodes as the detectors.
    They can switch extremely fast but the current transfer ratio is low, normally below 1%.
    Besides, there are full logic Optocoupler PCBs.
    They can switch very fast as they have integral light-emitting diode drivers and buffer amplifiers.
    This enables them to cover for delays within the LED output.
  • Phototransistor Optocoupler PCB
    These boards also have LED as the light source and bipolar phototransistors control their output circuits.
    Phototransistor Optocoupler PCBs can conduct in a single direction. Hence good for DC supply, controllers, and signal transmission.
    Besides, they are faster than photocells Optocoupler PCBs but slower than photodiodee Optocoupler PCBs.
    Also, phototransistor Optocoupler PCBs can have a wide array of current transfer ratios and they can step up the input current.
    Bipolar phototransistor Optocoupler PCBs can output their input current to 120%, while Darlington can reach 600%.
  • SCR and Triac Optocoupler PCB
    These two boards have high current-transfer ratios and are suitable for high voltage AC circuits.
  1. Opto-isolated SCR PCB
    These devices make use of silicon-controlled rectifiers [SCR] as the detectors.
    Also, they are suitable for step-up applications hence their switching speeds are slow to medium.
  2. Opto-isolated Triac PCB
    These devices have a triode for alternating current [Triac] output.
    Besides, Triacs allow current to flow in both directions unlink SCR which allows current to flow in one direction.
    Also, their current transfer ratio is high as that of opto-isolated SCR PCB.

How Does An Optocoupler PCB IC Operate?

Optocoupler IC

Optocoupler IC

The Optocoupler PCB IC operated by transferring energy to another circuit away from one circuit through an optical transmission path.

As it does this, it also provides electrical isolation.

Light emitter devices can originate from light-emitting diodes that produce laser diode, infrared or visible light.

Once the light emitter receives the input, it proceeds to convert it into a light signal.

Also, a light detector will sense the light emitter and convert it into electrical signals.

What Is An Optocoupler PCB IC?

Optocoupler PCB ICs are semiconductor devices that couple isolates circuits.

Optocoupler PCB IC

Optocoupler PCB IC

What Are Some Examples Of Optocoupler PCB ICs?

Diese umfassen:

  • Photo-transistor Optocoupler PCB IC include:
  1. K847PH
  2. PC816
  3. LTV817
  4. PC817
  • Photo-Darlington Optocoupler PCB IC include:
  1. 4N32
  2. H21B2
  3. 4N33
  4. H21B1
  5. H21B3
  • Photo-TRIAC Optocoupler PCB IC include:
  1. 4N35
  2. IL420
  • Photo-SCR Optocoupler PCB IC include:
  1. IL400
  2. MOC3071
  3. MOC3072
  • Photo-DIAC Optocoupler PCB IC include:
  1. MOC3020
  2. MOC3021

What Are Some Assembly Processes For Optocoupler PCBs?

SMT [Surface-mount technology]

You will mount them on top of the optocoupler printed circuit board via flat terminals or short leads.

Besides, the products are small, cost-effective, lightweight, and allows you to assemble them quickly.

THT [Thru-Hole-Technologie]

For these devices, you will use long leads that you will thread via holes in the optocoupler printed circuit board.

Besides, thru-hole technology offers a stronger mechanical connection than surface-mount technology.

Also, manufacturing processes are shifting to surface-mount technology. Whereas thru-hole technology is labor-intensive and needs large parts.


Here, you will attach the parts to the optocoupler PCB using long leads.

What Are Some Specifications Of Optocoupler PCBs?

Dazu gehören folgende:

Eingang und Ausgang

Optocoupler PCBs are listed by the output and input configurations of the circuit.

For instance, the input specifications have information relating to the light source such as:

  1. LED forward current
  2. Wellenlänge
  3. Energieverschwendung

The output specification contains information about the detector of the device.

Besides, the common specification for both circuits on the optocoupler PCB is isolation voltage.

Isolation voltage is also known as input to output isolation voltage and is a vital specification to optocoupler PCBs.

The isolation voltage will represent the ultimate voltage you can apply to the input and the output circuit.

Also maintain electrical isolation.

Current-transfer Ratio

This is the relationship between the output current and the input current that causes it.

Also, it is the minimum value that you will express as a percentage of the input current.

The basic current-transfer ratio is between 10% and 50% because equivalently to step-down isolation transformers.

Besides, there are optocoupler PCBs that can step-up the current inside the output current.

For instance, optocoupler PCBs containing photodarlington outputs can surpass 600%.

As the input light source becomes its brightest, the current-transfer ratio will be at its maximum value.

If you understand the current-transfer ratio of a device, you can configure it and effectively control the output current.


The design and manufacturing process of optocoupler PCBs can meet one or several standards.

For instance, the SMD 5962 family of standards has various optocoupler PCB product designs.

They should comply with MIL PRF 38534.

These are the General Specifications for Microcircuits.

What Should You Consider When Selecting Optocoupler PCBs?

220 V optocoupler PCB

220V Optocoupler PCB

Diese beinhalten Folgendes:


This is the minimum distance that is along the insulator between the input pins and the output pins.


These are useful in transmitting signals, like switches in PLC, power supplies, modems, inverters, etc.

Triac Output

These will handle current in both directions and they are useful in controlling AC load.

Thyristor Output

Optocoupler PCBs with thyristor output serve as gate circuits and voltage moves in a single direction.

IC Output

IC photo couplers tackle usages needing more operations on the output end.

Categories of IC output include high speed, IPM drivers, and IGBT/MOSFET driver.

Photo-relay Or MOSPHER Couplers

These will execute the switch function and include applications in set-top boxes, PLC and inverters, modems, etc.

Photovoltaic Or Photodiode Array [PDA]

PDAs can operate power MOSFETs with no external power supply.

Besides, you will use them when the switching needs surpass that of the photo relay.

Which Material Do You Use To Make Optocoupler PCB?

Diese umfassen:


This is a thin glass fabric that you will coat with resin then dry.


These are sheets of prepreg that you will laminate together through pressure and heat, and has copper foil on the sides.


This part offers circuitry on the surface of the laminate.


This is an epoxy coating that covers the circuits on the external parts of the optocoupler printed circuit board.


Also known as silkscreen, it contains alphanumerics about the components of the optocoupler PCB.

Endgültiges Ende

This is to offer a good solderable finish through the use of metallic coatings such as fold, nickel, or tin.

Why Are Optocouplers PCBs Commonly Used In Medical Electronics?

This is because it protects patients from the risk of electric shocks.

At Venture Electronics we design and manufacture a range of Optocoupler PCBs, depending on your unique requirements.

If you have any question or inquiry on Optocoupler PCB, Kontaktieren Sie jetzt das Venture-Team.

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