MCT61 IC Dual Channel Phototransistor Optocoupler IC

MCT61 IC Dual Channel Phototransistor Optocoupler IC 

The MCT61 is a dual-channel optoelectronic isolation device designed to provide safe and reliable electrical separation between two portions of a circuit that operate at different voltage levels or environments. It houses two independent optocoupler units within one compact 8-pin DIP package, helping designers save PCB space while allowing multiple isolated signal paths.

Each internal channel consists of a high-efficiency gallium arsenide infrared LED facing a silicon NPN phototransistor. When the input LED is energized, it emits infrared light, which is detected by the phototransistor, causing it to conduct. This optical coupling method ensures that the input and output remain electrically isolated, preventing high voltage spikes, ground loops, and noise interference.

The MCT61 is known for its excellent Current Transfer Ratio (CTR) stability, low LED driving current, and ability to handle a wide range of input signal levels. Because of its high isolation voltage (up to 5kV RMS), it is widely used in sensitive electronic applications where signal integrity and safety are essential.

The device is suitable for both DC signal transmission and low-speed switching applications, making it ideal for microcontroller interfaces, industrial control systems, power supplies, and communication circuits.

The phototransistor output allows for easy integration with logic systems and can be used with pull-up or pull-down configurations depending on circuit requirements. Additionally, the dual-channel configuration makes it efficient for applications that require multiple isolated control lines or signal feedback paths.

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Features

• Dual optocoupler channels in a single IC
• Phototransistor output type
• High isolation voltage (typically 5000 Vrms)
• Low input current for LED activation
• Wide Current Transfer Ratio (CTR)
• 8-pin DIP package
• Low power consumption
• Reliable and long operational life
• Suitable for DC signal interfacing and switching
• Compact solution for dual-signal isolation

Applications

• Microcontroller and digital logic signal isolation
• Dual-signal switching or sensing
• Industrial control interfaces
• AC mains to low-voltage system isolation
• SMPS feedback and control circuits
• Relay driver isolation
• Signal level shifting between noisy and sensitive circuits
• Telecommunication equipment
• Multi-channel sensor isolation

MCT6.. Datasheet