TLP281 4-Channel Optocoupler Isolation Module

The TLP281 4-Channel Optocoupler Isolation Module is designed for signal isolation and noise suppression between microcontrollers and high-voltage or noisy external circuits. This module uses four TLP281 optocouplers, providing safe electrical isolation and protecting sensitive components in automation, communication, and embedded systems.

Key Features of TLP281 4-Channel Optocoupler Isolation Module:

• 4 Independent Channels: Each channel uses a TLP281 optocoupler with separate input/output.
• High Electrical Isolation: Optically isolates microcontroller from high-voltage circuits.
• Low Input Current: Operates with low LED drive current, ideal for microcontroller GPIOs.
• Wide Supply Compatibility: Works with both 3.3V and 5V systems.
• Output Inversion Support: Can provide inverted logic output based on wiring.

Technical Specifications of TLP281 4-Channel Optocoupler Isolation Module:

• Operating Voltage: 3.3V to 5V
• Optocoupler IC: TLP281 (Phototransistor output type)
• Number of Channels: 4
• Isolation Voltage: 2500 Vrms (Typical)
• Input Current: 5-20mA per channel
• Output Type: Open Collector

Mechanical Specifications of TLP281 4-Channel Optocoupler Isolation Module:

• PCB Size: Approx. 45mm x 15mm
• Mounting Holes: 2 x M2 holes for easy fixing
• Connector Type: 2.54mm pitch header pins for easy integration
• PCB Material: FR-4, copper-clad, high-quality

Dimensions:

• Length: 45mm
• Width: 15mm
• Height: Approx. 10mm with components

Mounting Options:

• PCB Mount: Easily placeable in project enclosures.
• Screw Mount: Uses pre-drilled holes for firm mounting on panels or boards.

Schematic Diagram, Connection, Wiring and Pinout of TLP281 Module:

• Connection: IN1-IN4 connect to signal inputs; OUT1-OUT4 connect to load or MCU input; GND and VCC are power inputs.
• Wiring: Use inline current-limiting resistors if required; connect output with pull-up resistors if needed for logic level detection.
• Pinout:
  • • IN1 – Channel 1 input
    • IN2 – Channel 2 input
    • IN3 – Channel 3 input
    • IN4 – Channel 4 input
    • OUT1 – Channel 1 output
    • OUT2 – Channel 2 output
    • OUT3 – Channel 3 output
    • OUT4 – Channel 4 output
    • GND – Ground
    • VCC – Power supply (3.3V or 5V)

Datasheet of TLP281 4-Channel Optocoupler Module:

• Download TLP281 Datasheet (PDF)

Applications of TLP281 4-Channel Optocoupler Isolation Module:

• Signal Isolation: Prevents voltage spikes and noise from damaging control systems.
• Microcontroller Interfacing: Interfaces MCUs with motors, relays, and other external loads.
• Industrial Automation: Ideal for PLC signal isolation and feedback loops.
• Communication Circuits: Used in UART/RS232/RS485 isolation.
• Switching Applications: Enables noise-free transistor or relay switching.

Equivalent of TLP281 4-Channel Optocoupler Isolation Module:

• PC817 Module: Common optocoupler module with 4-channel design
• H11L1: High-speed logic output optocoupler alternative
• TLP521 Module: Equivalent for general-purpose isolation
• EL817 Module: Compact alternative with similar isolation characteristics

Package Includes:

• 1 x TLP281 4-Channel Optocoupler Isolation Module