MOC8101 Transistor Output Optocoupler Dip IC

MOC8101 Transistor Output Optocoupler Dip IC 

The MOC8101 is a phototransistor-based optocoupler designed to provide safe electrical isolation between low-voltage control circuits and high-voltage or noisy systems.
It consists of two main parts:

• An infrared LED (input side)
• A phototransistor (output side)

When the LED is activated by an input signal, it triggers the phototransistor to conduct, transferring signals across the isolation barrier without any direct electrical connection.

This isolation helps protect microcontrollers, logic circuits, and sensitive electronics from high voltage spikes, ground loops, and electrical noise.

The MOC8101 offers higher current transfer ratio (CTR) compared to standard optocouplers, making it useful for general-purpose switching and signal isolation.

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Features

• Phototransistor output optocoupler
• High input–output isolation (typically 5000V RMS)
• High CTR (current transfer ratio)
• Low input LED drive requirement
• Protects circuits from voltage spikes and noise
• Compatible with TTL, CMOS, and microcontroller logic
• Wide operating temperature range
• Standard 6-pin DIP package
• Reliable signal transfer across isolation barrier

Applications

• Microcontroller I/O isolation
• Switching low-current loads
• Interfacing noisy or high-voltage circuits
• SMPS feedback and regulation circuits
• Digital logic isolation
• Signal transmission across different ground potentials
• AC mains monitoring (isolated logic side)
• Industrial automation and control
• Motor drive signal isolation
• Relay and triac driver pre-stages
• Protection against ground loops and transients