4N35 Optocoupler IC

The 4N35 is a general-purpose optocoupler IC from onsemi, designed to provide electrical isolation between input and output circuits using light. This single-channel device consists of a gallium arsenide infrared LED and a silicon NPN phototransistor, housed in a standard 6-pin dual-in-line package (DIP).

Key Features:

• Isolation Voltage: 5000 VRMS for 1 minute
• Current Transfer Ratio (CTR): Minimum 100% at IF = 10 mA, VCE = 10 V
• Input-Output Coupling Capacitance: Less than 0.5 pF
• Operating Temperature Range: -55°C to +110°C
• Package: 6-pin DIP with wide lead spacing options

Applications:

• Power supply regulators
• Digital logic inputs
• Microprocessor inputs
• Relay driving circuits
• Switch-mode power supply feedback
• AC mains detection
• Logic ground isolation

Pin Configuration:

• Pin 1 (A): Anode
• Pin 2 (C): Cathode
• Pin 3 (NC): Not Connected
• Pin 4 (E): Emitter
• Pin 5 (C): Collector
• Pin 6 (B): Base

For more detailed information, you can refer to the 4N35 Datasheet.

YouTube Tutorials:

• Working Principle of Opto Coupler IC 4N35 Circuit
• Controlling 4N35 optocoupler using a GPIO signal from PI 4 or Arduino