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4N35 Optocoupler/Phototransistor IC - DIP-6 Package

SKU: UYDAJ64NMU
The 4N35 is a widely used optocoupler (opto-isolator) that provides electrical isolation between input and output circuits through an infrared LED and a phototransistor. It enables safe signal transmission while preventing direct electrical connection, protecting sensitive electronics from high voltages, electrical noise, and ground loops. The device consists of a gallium arsenide infrared LED optically coupled to an NPN silicon...
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Specifications

Specifications:

Component Type: Optocoupler / Optoisolator
Model: 4N35
Package Type: DIP-6
Output Type: NPN Phototransistor
Number of Channels: 1 Channel
Isolation Voltage: 5000Vrms Typical
Input LED Forward Voltage: 1.2V Typical
Input LED Forward Current: 60mA Maximum
Reverse Voltage (LED): 6V Maximum
Collector-Emitter Voltage (VCEO): 30V Maximum
Emitter-Collector Voltage (VECO): 7V Maximum
Collector Current (IC): 50mA Maximum
Current Transfer Ratio (CTR): Typically 100% Minimum
Power Dissipation: 150mW Typical
Rise Time: Approximately 10µs Typical
Fall Time: Approximately 10µs Typical
Operating Temperature Range: -55°C to +100°C
Storage Temperature Range: -55°C to +150°C
Mounting Type: Through-Hole
Pin Count: 6

Additional Resources

4N35.PDF

FAQ

1. What is the 4N35 optocoupler used for?

The 4N35 is used to electrically isolate two circuits while allowing signals to pass safely between them, protecting sensitive electronics from high voltages and noise.

2. How does the 4N35 work?

The internal infrared LED emits light when powered, which activates the phototransistor on the output side, transferring the signal without a direct electrical connection.

3. What is the isolation voltage of the 4N35?

The 4N35 typically provides up to 5000Vrms of electrical isolation between the input and output circuits.

4. Can the 4N35 be used with Arduino and other microcontrollers?

Yes, the 4N35 is commonly used with Arduino, ESP32, STM32, Raspberry Pi, and other microcontrollers for signal isolation and protection.

5. What advantage does the 4N35 offer in electronic circuits?

It improves safety, reduces electrical noise, prevents ground loops, and protects low-voltage control circuits from high-voltage systems.

View full product details

The 4N35 is a widely used optocoupler (opto-isolator) that provides electrical isolation between input and output circuits through an infrared LED and a phototransistor. It enables safe signal transmission while preventing direct electrical connection, protecting sensitive electronics from high voltages, electrical noise, and ground loops.

The device consists of a gallium arsenide infrared LED optically coupled to an NPN silicon phototransistor, housed in a compact DIP-6 package. The 4N35 is commonly used in microcontroller interfacing, switching power supplies, industrial automation systems, communication circuits, motor control systems, and signal isolation applications.

Its high isolation voltage and reliable performance make it a preferred choice for safely interfacing low-voltage logic circuits with higher-voltage systems.

Key Features

  • Infrared LED and phototransistor output
  • High electrical isolation between circuits
  • DIP-6 through-hole package
  • NPN phototransistor output
  • High isolation voltage capability
  • Low power consumption
  • Excellent noise immunity
  • Reliable signal transmission
  • Wide operating temperature range
  • Easy microcontroller interfacing
  • Suitable for digital and analog isolation
  • Long operational life
  • Compact and lightweight design
  • Ideal for industrial and embedded applications