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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.
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.
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).
GuuYebe PC817 Optocoupler / PC817C Spec: Photocoupler output type is phototransistor , Number of pins is 4, Needle distance is 2.54mm , Package quantity is 50 pieces.
GuuYebe PC817 Optocoupler has been widely applied: Replace equipment parts,include as SCR system equipmen etc ...
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.
24V optocoupler isolation board with EL817 features, providing a wide input signal voltage range of DC1.8V-24V and a maximum input current of 50MA. Ideal for 1 channel opto PNP NPN signal conversion and optoelectronic isolation applications. Input 24V...
Optocoupler isolation module with PC817 card rail bracket, offering an impressive isolation voltage of over 3000V and a maximum output current of 50MA. Suitable for various optoelectronic isolation and signal conversion needs, with a working temperature...
1 channal optocoupler isolation module for signal conversion and isolation, featuring a wide input signal voltage range of DC1.8V-24V and a maximum output current of 50MA. The optocoupler isolation module is designed for compatibility with input 24V...
Optoelectronic isolator with 3-5 V input and EL817 optocoupler, delivering an outstanding isolation voltage exceeding 3000V and a maximum output current of 50MA. Suitable for opto PNP NPN signal conversion and various optoelectronic isolation...
Last update on 2026-10-15 / 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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