4N25 3.75KV 30V 20%

The 4N25 is a general-purpose optocoupler designed for electrical isolation between circuits, enabling secure signal transmission without direct electrical connection. This device features an infrared LED and an NPN phototransistor, all within a convenient 6-pin DIP package.

Key Features

- Optically coupled isolator

- Infrared emitting diode (IRED) and NPN phototransistor

- High isolation voltage: 5000 Vrms (minimum)

- Low input current requirement

- High current transfer ratio (CTR)

- Compact 6-pin DIP package

- RoHS compliant

Applications and Use Cases

- Signal isolation in control systems: Protects sensitive components from high voltage spikes.

- Microcontroller interfacing: Enables microcontrollers to manage devices such as DC motors and relays.

- Switching power supplies: Provides feedback signals while isolating the control circuit.

- Industrial automation: Improves system performance, safety, and reliability in industrial settings.

- Motor controls: Isolates the control circuit from the motor circuit, preventing electrical noise.

- Consumer electronics: Used in various consumer electronic devices for safety and isolation.

- AC mains detection: Detects AC power mains.

- Reed relay driving: Drives reed relays.

- Telephone ring detection: Detects telephone rings.

- Logic ground isolation: Isolates logic grounds between circuits operating at different voltages.

- Logic coupling with high-frequency noise rejection: Couples logic signals while rejecting high-frequency noise.

The 4N25 offers an excellent balance of protection, efficiency, and reliability, making it a versatile component for modern circuit design. It facilitates secure interaction between low-voltage devices and higher voltage components, enhancing both safety and power efficiency.