Elecbee PC817 4-Channel Optocoupler Isolation Module 3.6-24V Input 3.6-30V 10mA Output 4kHz High Low Level Converter

Elecbee PC817 4-Channel Optocoupler Isolation Module

The Elecbee PC817 optocoupler isolation module transfers compatible control signals between circuits operating at different voltage levels. Four optocoupler channels can be controlled independently, making the board suitable for PLC interfaces, industrial switching signals and low-current voltage conversion.

The rated control-input range is 3.6–24V DC, while the output side supports 3.6–30V DC with a conservative maximum output-current limit of 10mA. Onboard jumper caps allow selection between high-level and pull-down output responses.

Technical Specifications

Product Type: Optocoupler isolation and voltage conversion module
Optocoupler: PC817
Number of Channels: 4
Channel Operation: Independently controlled signal channels
Control-Side Input Voltage: 3.6–24V DC
Output-Side Voltage Range: 3.6–30V DC
Specified Output-Current Limit: 10mA maximum
Recommended Maximum Pulse Frequency: 4kHz
Output Selection: High-level or pull-down output via jumper caps
Board Dimensions: 48 × 38mm
Long-Side Hole Spacing: 42mm
Short-Side Hole Spacing: 32mm

Control-Side Voltage Compatibility

The rated 3.6–24V input range supports compatible 5V controller outputs and higher-voltage 12V or 24V industrial control signals.

3.3V Logic Note: A 3.3V logic-high level is below the specified 3.6V minimum. Some board versions may respond to 3.3V, but reliable operation must be verified with the actual controller, module revision and operating conditions.

Output Voltage and Current

The output side supports compatible voltages from 3.6V to 30V DC. Do not exceed the specified 10mA output-current limit, and treat this value conservatively until the loading arrangement for the exact board revision has been confirmed.

The output is intended for signal interfacing and low-current control. Use an appropriate transistor, MOSFET driver, relay driver or other external switching stage when the connected load requires more than 10mA.

Relay Compatibility: Do not connect a relay coil directly unless its required current is confirmed to remain within the module limit. Most higher-current relay coils require an external driver and flyback protection.

Jumper-Selectable Output

The onboard jumper caps select a high-level or pull-down output response. Set the jumpers before applying power and verify the signal polarity required by the receiving circuit.

Although the four optocouplers provide independently controlled signal channels, do not assume that all four channels have separately isolated power rails or grounds. Confirm the PCB markings or wiring diagram when different output-side voltage systems are used.

Pulse Signals and Applications

The module is suitable for on/off switching and compatible low-frequency pulse signals up to the recommended 4kHz limit. Applications include PLC interfaces, industrial control panels, sensor-output isolation, voltage-level conversion and external transistor or MOSFET driver control.

The 4kHz value is a recommended operating limit for this assembled module. It should not be described as the absolute frequency limit of every PC817 optocoupler under all circuit conditions.

The board is not recommended for SPI, I2C, high-speed UART, fast PWM or other interfaces requiring precise high-frequency switching.

Installation Notes