4N33 Optocoupler IC (SOIC 6, Photodarlington Output, Electrical Isolation)

The 4N33 is a photodarlington output optocoupler designed to transfer electrical signals between two circuits while maintaining electrical isolation. It contains an infrared emitting diode and a silicon photodarlington detector. This high gain configuration provides a high current transfer ratio, making it suitable for low current input signals and isolated switching applications. The standard 4N33 is commonly available in a 6 pin DIP package, while surface mount versions use specific package ordering codes. Verify the exact SOIC 6 variant before ordering or designing a PCB.

Key Features -

• Infrared LED input with photodarlington output

• High current transfer ratio

• Electrical isolation between input and output circuits

• High isolation resistance

• Single channel signal isolation

• Suitable for low current input control signals

• Surface mount option depends on the exact manufacturer part number

Specifications -

• Part Number: 4N33

• IC Type: Transistor Output Optocoupler

• Output Type: Photodarlington

• Input Type: Infrared emitting diode

• Package: SOIC 6, verify exact ordering code

• Number of Channels: 1

• Collector Emitter Breakdown Voltage: 30V for the referenced datasheet variant

• Isolation Voltage: Up to 5300V RMS for specified variants and test conditions

• Current Transfer Ratio: High gain, typically specified at a minimum of 500 percent for referenced variants

• Pin configuration and electrical ratings: Confirm against the exact manufacturer datasheet

Applications -

• Microcontroller signal isolation

• Industrial control circuits

• Switching power supplies

• Solid state relay driver circuits

• Telecommunications equipment

• Low power logic interfaces

• Isolation between control and load circuits