- Stock: In Stock
- Model: 4N35
- SKU: 779
4N35 6-Pin General Purpose Optocoupler
The 4N35 is a classic general purpose optocoupler (also known as an optoisolator) housed in a compact 6-pin DIP package. It combines a gallium arsenide infrared LED on the input side with a silicon NPN phototransistor on the output side, providing reliable electrical isolation between two circuits while allowing signal transfer via light. This makes it an essential component for protecting sensitive electronics from high voltages, noise, and voltage spikes.
Key Features
The 4N35 offers a high isolation voltage rating of up to 5000V RMS between input and output, ensuring robust galvanic separation. It supports a collector-emitter voltage of 70V and delivers a current transfer ratio (CTR) of typically 100% or higher at a forward input current of 10mA. The device operates reliably across a wide temperature range and responds quickly, with typical rise and fall times in the microsecond range, making it suitable for both digital logic interfacing and low-speed analog switching applications.
Applications
This versatile optocoupler is widely used in microcontroller projects for isolating input and output signals, interfacing Arduino and other development boards with higher voltage circuits, AC mains detection and zero-crossing detection circuits, switch-mode power supply feedback loops, industrial control systems, and communication interface isolation. It is a popular choice among hobbyists, students, and engineers for building electrically isolated interfaces safely.
Package and Handling
The 4N35 comes in a standard 6-pin dual in-line package (DIP-6) that fits directly into breadboards and perforated prototyping boards, making it ideal for through-hole soldering and experimentation. Its pinout consists of the LED anode and cathode on pins 1 and 2, with the phototransistor emitter, collector, and base connections on pins 4, 5, and 6 respectively. Simply pair it with a current-limiting resistor on the input LED to begin using it in your designs.
