4N35 IC – Optocoupler Phototransistor IC

The 4N35 IC – Optocoupler Phototransistor IC is an infrared emitter diode drives a phototransistor. They are also known as opto isolators since they separate two circuits optically. The 4N35 optocoupler consists of gallium arsenide infrared LED and a silicon NPN phototransistor.

These are used to couple two circuits without any ohmic contact. They allow one of the circuits to switch another one while they are completely separate. The first circuit is connected to IR diode while the other circuit with the phototransistor. The isolation ensures that no damage occurs in either of the circuits while the other one has a fault.

Features:

• Gallium-Arsenide-Diode Infrared Source Optically Coupled to a Silicon npn Photo-transistor
• High Direct-Current Transfer Ratio
• High-Voltage Electrical Isolation 1.5-kV, 2.5-kV, or 3.55-kV Rating
• High-Speed Switching tr = 7 µs, tf = 7 µs Typical
• Input-to-output peak voltage (8-ms half sine wave)4N35= 3.55 kV
• Input-to-output root-mean-square voltage (8-ms half sine wave)4N35= 2.5 kV
• Collector-base voltage=70 V
• Collector-emitter voltage=30 V
• Emitter-base voltage=7 V
• Input-diode reverse voltage=6 V
• Input-diode forward current: Continuous 60 mA
• Typical Applications Include Remote Terminal Isolation, SCR and Triac Triggers, Mechanical Relays and Pulse Transformers

Specifications:

• VR: Reverse voltage: 6 V
• IF: Forward current: 60 mA
• IFSM: Surge current: 2.5 A
• Pdiss: Power dissipation: 100 mW
• VCEO: Collector-emitter breakdown voltage: 70 V
• VEBO: Emitter-base breakdown voltage: 7 V
• IC: Collector current: 100 mA
  

Applications:

• AC mains detection
• Reed relay driving
• Switch mode power supply feedback
• Telephone ring detection
• Logic ground isolation
• Logic coupling with high frequency noise rejection

Package Includes:

• 1 x 4N35 Optocoupler IC

Useful Resources:

• 4N35 Optocoupler Datasheet