PC123 Optocoupler IC

PC123 Optocoupler IC 

The PC123 is a widely used phototransistor output optocoupler designed to provide reliable electrical isolation between input and output circuits.
It consists of an infrared LED and a phototransistor, encapsulated in a 4-pin plastic DIP package.

With its high isolation voltage and stable CTR (Current Transfer Ratio), the PC123 is commonly used in signal isolation, switching, and interfacing between low-voltage logic circuits and higher-voltage or noisy environments.

It is especially popular in consumer electronics, SMPS, microcontroller interfaces, and industrial control systems.

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Features

• Phototransistor output optocoupler
• High isolation voltage: typically 5000 Vrms
• Wide CTR range (50% to 600%)
• Low input LED current requirement
• 4-pin DIP package
• Fast response suitable for general switching
• Low power consumption
• Highly reliable and cost-effective

Applications

• Signal isolation between microcontroller and high-voltage circuits
• AC mains sensing and monitoring
• Switch-mode power supplies (SMPS)
• Power line monitoring and protection circuits
• Industrial automation and control
• Relay drive isolation
• Triac or transistor triggering
• Noise immunity enhancement in digital interfaces
• Feedback circuits in isolated power supplies