MOC8104 Transistor Output Optocoupler IC

MOC8104 Transistor Output Optocoupler IC 

The MOC8104 is a high-sensitivity phototransistor optocoupler designed to provide robust electrical isolation between low-voltage control circuitry and high-voltage or noisy systems.
It contains:

• An infrared LED (input side)
• A high-gain phototransistor (output side)

When the input LED is energized, the phototransistor conducts, enabling signal transfer across the isolation barrier without any physical electrical connection.
The MOC8104 features a very high Current Transfer Ratio (CTR)—higher than MOC8101 and MOC8102—making it suitable for applications requiring extremely sensitive signal detection or very low LED drive current.

It is commonly used in industrial control, SMPS feedback, sensor isolation, and microcontroller-based systems.

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Features

• Phototransistor output optocoupler
• Very high CTR (highest in MOC810x series)
• Input-to-output isolation: 5000V RMS
• Requires very low LED current to operate
• Works with TTL, CMOS, and microcontroller outputs
• Low input-output capacitance for noise immunity
• Ideal for analog and digital signal isolation
• Standard DIP-6 package
• Wide operating temperature range
• Protects delicate circuitry from high-voltage spikes and ground loops

Applications

• Microcontroller and PLC input protection
• Low-current sensor signal isolation
• SMPS feedback and voltage regulation circuits
• Isolation in communication interfaces
• Industrial automation control
• Motor driver and inverter signal isolation
• General-purpose digital and analog isolation
• Monitoring AC or high-voltage systems
• Relay/transistor/triac pre-driver circuits
• Systems with different ground references
• Protection from electrical noise, surges, and EMI