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Optocouplers are essential components for isolating electrical signals between two circuits, preventing damage from voltage spikes and noise. Selecting the appropriate optocoupler is crucial for ensuring the safety, reliability, and performance of your electronic systems, especially in demanding industrial environments.
Application: PC817 optocoupler is widely used in computer terminals, thyristor system equipment, measuring instruments, copiers, automatic ticketing, household appliances.
NOYITO 1-Channel PC817 Optocoupler Isolation module adopts 5.0 pitch screw terminals for easy wiring . The module can play the role of isolation when the output level of the single-chip microcomputer drives the inductive devices such as motors and motors...
The module can be used for high-voltage detection. For example, if the output signal level of a sensor is 12V, and the voltage of the microcontroller is 5V, this module can be used for isolation detection.
The module can also be used for current amplification. For example, when the output current of the microcontroller is too small to drive certain circuits, this module can be used for amplification.
Input signal voltage: 3-5V / 12V / 24V (optional).
Output signal voltage: wide voltage, suitable for DC1.8 - 24V.
PC817 4 channel optocoupler isolation board is independent, can control different voltage at then same time.
4-way 817 optocoupler driving port signal voltage:3.6-24V; Output voltage range: 3.6-30V(The output current depends on the specific situation but not over 10MA. When the total power is fixed, the voltage and current are inversely proportional).
4 way 817 optocoupler to achieve the control signal and the control signal isolation, you can directly use the microcontroller or other devices IO port to achieve voltage isolation control, you can achieve a small voltage control, the control side can be...
PC817 module jumper cap can be used to determine whether the output terminal is high potential output or low output.
If it is a pulse signal, please note that the limit of 817 is below 3KHZ. If the control signal is greater than 3KHZ, please do not use this module, it will not work properly.
Package quantity: 50 pieces, packed in a durable and resealable plastic storage box.
Application: PC817 photocoupler is widely used in computer terminals, SCR system equipment, measuring instruments, photocopiers, automatic ticketing, household appliances
PC817 8 channel optocoupler isolation board is independent, can control different voltage at then same time.
8-way 817 optocoupler driving port signal voltage:3.6-24V; Output voltage range: 3.6-30V(The output current depends on the specific situation but not over 10MA. When the total power is fixed, the voltage and current are inversely proportional).
PC817 optocoupler module can realize 3.3V or 5V control the interface of 3.6-30V voltage level.After the control terminal is turned on, the controlled terminal will also be turned on.Voltage conversion,and can realize to drive a high level from a low...
Photoelectric isolation has strong anti-interference ability. It can drive high-power triodes, MOS tubes and other applications that require high-voltage driving, and can also directly drive low-power 24V relays.
If it is a pulse signal, please note that the limit of 817 is 4KHZ or less. If the control signal is greater than 4KHZ, please do not use this module, it will not work properly.
1-way 817 optocoupler drive terminal input signal voltage: DC 3V-5V/12V/24V (optional); Output signal voltage: wide voltage suitable for DC1.8V-24V.
The 1-way optocoupler isolation module is suitable for isolation when the output level of the single-chip microcomputer is used to drive inductive components such as motors, and anti-interference protects some circuits of the single-chip microcomputer.
PC817 1 channel way optocoupler isolation board are good as the level converter(NPN-PNP, PNP-NPN), and can also be used to input a signal to MCU in isolation or MCU control another device in isolation.
Photoelectric isolator rail holder PLC drive motor board output level of the single-chip microcomputer is low, and the driving voltage of the driven module is high for level matching.
【Relay Switch Module】5pcs 1-channel photocoupler isolator with stable performance, triggered by DC 12V and 1mA current.
【Signal Voltage】Positive phase amplification with high-level trigger. Output equals input.
【Level Converter】Opto-isolators can be used as level converters (NPN-PNP, PNP-NPN), signal input to MCU in isolation, or MCU-controlled device output in isolation.
【Control Transformer】Optocoupler isolation board provide isolation between low and high-voltage circuits when used with other electronic devices.
【Functional Application】Devices for microprocessor Input/Output switching, DC/AC power control, communications equipment protection, and power supply regulation.
Last update on 2026-07-10 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Optocouplers
Package Types and Mounting
Optocouplers come in various package types, including through-hole (DIP) and surface-mount (SMD) options. Through-hole components are easier to prototype with and can be more robust in certain applications. Surface-mount devices are ideal for compact designs and automated assembly processes. Ensure the chosen package type is compatible with your PCB design and manufacturing capabilities.
Frequently Asked Questions
What is the primary function of an optocoupler?
The primary function of an optocoupler is to provide electrical isolation between two circuits using light. This prevents high voltages or electrical noise from damaging sensitive components on one side of the circuit.
What does Current Transfer Ratio (CTR) mean?
Current Transfer Ratio (CTR) is a key specification indicating the efficiency of an optocoupler. It's the ratio of output current to input current, with higher CTR values meaning more output current is generated for a given input current.
How do I choose the correct isolation voltage?
The isolation voltage rating should be significantly higher than the maximum voltage difference expected between the input and output circuits. Consider safety margins and potential voltage transients in your application.
Are optocouplers suitable for high-speed applications?
Some optocouplers are designed for high-speed applications. Look for devices with fast response times and specific designations like high-speed optocouplers or those with logic gate outputs.
What is the difference between a phototransistor and a photodarlington optocoupler?
Photodarlington optocouplers offer a higher current gain and thus a higher CTR than standard phototransistor optocouplers. However, they generally have slower switching speeds.
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