Vishay 4N35 Optocoupler, Transistor Output, DIP 6-Pin, 50 mA

The Vishay 4N35 is a high-performance, through-hole phototransistor output optocoupler presented in a standard 6-pin DIP package. This essential electronic component is engineered to provide reliable electrical isolation and signal transfer, making it a cornerstone in a wide array of circuit designs where safety and noise immunity are paramount.

Each unit is constructed from a gallium arsenide infrared LED optically coupled to a silicon NPN phototransistor. This design ensures efficient light transmission and precise signal conversion. A key feature is the accessible base connection on the phototransistor, which allows for greater control over switching speed and sensitivity, offering designers enhanced flexibility in their applications.

Robust Specifications and Certifications

Built to meet rigorous international safety standards, the 4N35 provides peace of mind for commercial and industrial applications. It boasts a formidable isolation test voltage of 5000Vrms, effectively preventing dangerous voltage spikes from crossing the isolation barrier. With a minimum current transfer ratio (CTR) of 100% and a forward current rating of 50mA, it delivers strong, consistent performance. The device operates reliably across an extensive temperature range from -55°C to 100°C.

Versatile Applications

This optocoupler is widely utilised for isolating low-voltage control circuits from high-voltage AC mains, making it ideal for AC mains detection and switch mode power supply feedback loops. It is equally effective in telecommunications for telephone ring detection, in industrial controls for driving reed relays, and in digital systems for logic coupling with high-frequency noise rejection. Its ability to separate grounds makes it indispensable for preventing ground loops and protecting sensitive logic circuitry.

Key Features & Specifications

• Core Construction: Gallium arsenide IRED,