The 4N35 optocoupler is a DIP-6 packaged optoelectronic device that contains a gallium arsenide infrared LED optically coupled to a silicon phototransistor. It is used to transfer electrical signals between two isolated circuits while maintaining complete electrical isolation.

This optocoupler is perfect for protecting microcontrollers, eliminating ground loops, and ensuring safe communication between high-voltage and low-voltage sections in a circuit. It is commonly used in switching circuits, signal transmission, and interfacing logic-level devices to high-power components.

Key Features:

✅ Optical Isolation – Provides galvanic isolation between input and output circuits.
✅ Phototransistor Output – Ideal for logic signal interfacing and voltage level shifting.
✅ High Current Transfer Ratio (CTR) – Efficient signal transmission with low LED current.
✅ DIP-6 Package – Easy to use with breadboards and through-hole PCB designs.
✅ Compatible with Microcontrollers – Works with Arduino, Raspberry Pi, ESP32, and other embedded systems.
✅ Fast Switching Speed – Suitable for high-frequency applications.
✅ Wide Operating Voltage Range – Compatible with 3.3V, 5V, and 12V control circuits.
✅ Protects Microcontrollers & Low-Voltage Circuits – Used in motor drivers, relay circuits, and power isolation applications.