Optocouplers

An optocoupler, also known as an opto-isolator or photocoupler, is a semiconductor device which is used to couple isolated circuits. Within an optocoupler you will find a light emitter and a light sensor. Optocouplers usually come in a semiconductor package, such as SOIC or PDIP.

How does an optocoupler work?
Optocouplers work by transferring energy from one circuit to another circuit via an optical transmission path, while providing electrical isolation
The light emitter device can come in the form of an LED (light emitting diode) that produces IR or visible light, or a laser diode. The light emitter receives the input and converts it into a light signal. The light detector senses the light emitter and converts it back into an electrical signal.

Optocouplers are often used in high-voltage applications to block the high voltages and variations in voltage. This ensures that, if there is a spike in one part of a circuit, it will not affect other parts. Therefore they are ideal for applications which may experience variations in voltage.

Types of Optocoupler:
• Resistive
• Photodiode
• Phototransistor
• Bidirectional

Output Types
• CMOS
• Darlington
• IGBT Gate Drive
• Logic Gate
• MOSFET
• Photodarlington
• Phototransistor
• Single Transistor
• TRIAC

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Description Price Mounting Type Output Device Maximum Forward Voltage Number of Channels Number of Pins Package Type Input Current Type Typical Rise Time Maximum Input Current Isolation Voltage Logic Output Maximum Current Transfer Ratio Minimum Current Transfer Ratio Typical Fall Time
RS Stock No. 173-2229
Mfr. Part No.K1010 B
BrandCosmo
£0.117
Each (On a Reel of 2000)
Units
Through Hole Transistor 1.4V - 4 DIP - 5µs 50 mA 5 kVrms - 260% 60 % 4µs
RS Stock No. 395-6344
Mfr. Part No.K1010 B
BrandCosmo
£0.208
Each (In a Pack of 10)
Units
Through Hole Transistor 1.4V - 4 DIP - 5µs 50 mA 5 kVrms - 260% 60 % 4µs
RS Stock No. 169-8133
Mfr. Part No.KPC357NT0B
BrandCosmo
£0.167
Each (On a Reel of 3000)
Units
Surface Mount Transistor 1.4V - 4 DIP - 5µs 50 mA 3.75 kVrms - 260% 130 % 4µs
RS Stock No. 395-6293
Mfr. Part No.KPC357NT0B
BrandCosmo
£0.256
Each (In a Pack of 10)
Units
Surface Mount Transistor 1.4V - 4 DIP - 5µs 50 mA 3.75 kVrms - 260% 130 % 4µs
RS Stock No. 395-6338
Mfr. Part No.KM0C3022
BrandCosmo
£0.791
Each (In a Pack of 10)
Units
Through Hole Phototriac 1.5V - 6 DIP - - 50 mA 5 kVrms - - - -