Optocoupler

Key Features

• Galvanic Isolation: Physically separates input and output circuits to prevent damage from high-voltage spikes.
• High Noise Immunity: Uses light to transmit data, making it immune to electromagnetic interference (EMI).
• Compact Integration: Available in small 4-pin or 6-pin packages to save board space.
• Safe Switching: Ideal for controlling high-voltage AC or DC loads from low-voltage 3.3V or 5V microcontrollers.
• Reliable Solid-State Design: No moving parts means no mechanical wear and near-instantaneous switching speeds.

Technical Specification

Isolation Voltage                                         2,500V to 5,000Vrms (Model dependent)

Current Transfer Ratio (CTR)               50% to 600%

Input Forward Current                           10mA to 50mA

Output Collector-Emitter Voltage       30V to 80V (Standard types)

Package Types                                             DIP-4, DIP-6 (Through-Hole) / SOP-4 (SMD)

Response Time                                           2$\mu$s to 18$\mu$s (Rise/Fall)

Channels Available                                   Single, Dual, or Quad-channel modules

Common Applications

• Microcontroller Protection: Safeguarding Arduino, ESP32, or Raspberry Pi pins from high-voltage relay or motor noise.
• Switching Power Supplies (SMPS): Providing feedback from the output to the input side while maintaining isolation.
• Industrial PLC Systems: Interfacing sensors and actuators with central control units in noisy factory environments.
• Ground Loop Elimination: Breaking electrical connections between different parts of a system to prevent hum or data errors.
• Telecommunications: Isolating telephone lines and modems from computer hardware.