Types of Photocouplers (Packages)

Photocouplers are required to have a package shape and dielectric strength based on safety standards. When designing in accordance with safety standards, you need to check the following items.

Creepage distance of isolation
The shortest distance along the surface of the insulator between two conductors (primary and secondary).
The shortest distance between two conductors measured through air.
Insulation thickness
The minimum distance of insulator between two conductors
Isolation voltage
Isolation voltage between two conductors *
In the case of UL, the AC voltage that does not break the insulation even if it is applied for 1 minute is specified.

* Products with isolation voltage ranging from 2,500 Vrms to 5,000 Vrms are mainstream.

Types of Photocouplers (Packages)

Chapter V : Optical Semiconductors

Types of Optical Semiconductors
Light-Emitting Principal of LEDs
The wavelength range of LEDs
What Is a Photocoupler?
Why Are Photocouplers Necessary?
Types of Photocouplers
Types of Photocouplers (Internal Structure)
Safety Standards of Photocouplers
Characteristics of Photocouplers (Current Transfer Ratio: CTR)
Principal Characteristics of Photocouplers (Trigger LED Current)
Aging Variation Data of Photocouplers
How to Use a Photocoupler
How to Use a Photocoupler “Input Current”
How to Use a Photocoupler “Output Current”
How to Use a Photocoupler “Output-Side Resistor”
How to Use a Photocoupler Check

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