Optocoupler ICs

An optocoupler IC, 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 IC 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. 625-7909
Mfr. Part No.6N137(F)
BrandToshiba
£1.07
Each
Units
Through Hole Transistor 1.75V 1 8 DIP DC 30ns 20 mA 2.5 kVrms Yes 1000% 1000 % 30ns
RS Stock No. 100-0151
Mfr. Part No.TLP250(F)
BrandToshiba
£1.548
Each (In a Pack of 5)
Units
Through Hole Transistor 1.3V 1 8 PDIP DC 2µs 300 mA 2500 V ac Yes - - -
RS Stock No. 177-4798
Mfr. Part No.TLP251(F)
BrandToshiba
£0.768
Each (In a Tube of 20)
Units
- - - - - - - - - - - - - -
RS Stock No. 625-8413
Mfr. Part No.TLP251(F)
BrandToshiba
£1.32
Each
Units
Through Hole Buffer, Totem-Pole 1.8V 1 8 PDIP DC - 10 mA 2.5 kVrms Yes - - -
RS Stock No. 672-2866
Mfr. Part No.TLP251(F)
BrandToshiba
£1.002
Each (In a Pack of 5)
Units
Through Hole Buffer, Totem-Pole - 1 8 PDIP DC - - 2.5 kVrms Yes - - -
RS Stock No. 168-7424
Mfr. Part No.TLP350(TP5,F)
BrandToshiba
£1.547
Each (In a Tube of 50)
Units
Surface Mount IGBT Gate Drive, MOSFET 1.8V 2 8 PDIP DC 15ns 20 mA 3.75 kVrms - - - 8ns
RS Stock No. 760-3221
Mfr. Part No.TLP350(TP5,F)
BrandToshiba
£2.47
Each
Units
Surface Mount IGBT Gate Drive, MOSFET 1.8V 2 8 PDIP DC 15ns 20 mA 3750 V ac - - - 8ns
RS Stock No. 186-022
Mfr. Part No.TLP350(F)
BrandToshiba
£1.605
Each (In a Pack of 2)
Units
Through Hole IGBT Gate Drive, MOSFET - 1 8 PDIP DC - - 3.75 kVrms Yes - - -
RS Stock No. 625-8463
Mfr. Part No.TLP627-2(F)
BrandToshiba
£1.22
Each
Units
Through Hole Darlington 1.3V 2 8 PDIP DC 40µs 50 mA 5 kVrms - 4000% 1000 % 15µs
RS Stock No. 168-7808
Mfr. Part No.TLP175A
BrandToshiba
£0.519
Each (In a Tube of 125)
Units
Surface Mount MOSFET 1.4V 1 4 SOIC AC 1ms 80 mA 3.75 kVrms - - - 1ms
RS Stock No. 885-1424
Mfr. Part No.TLP175A(E(T
BrandToshiba
£0.699
Each (In a Pack of 10)
Units
- - - - - - - - - - - - - -
RS Stock No. 796-5213
Mfr. Part No.TLP175A
BrandToshiba
£0.826
Each (In a Pack of 5)
Units
Surface Mount MOSFET 1.4V 1 4 SOIC AC 1ms 80 mA 3750 Vrms - - - 1ms
RS Stock No. 625-8772
Mfr. Part No.TLP523-4(F)
BrandToshiba
£2.30
Each
Units
Through Hole Darlington 1.3V 4 16 PDIP DC - 50 mA 2.5 kVrms - 2000% 1000 % -
RS Stock No. 695-6268
Mfr. Part No.TLP701(F)
BrandToshiba
£2.36
Each
Units
Surface Mount IC 1.75V 1 6 SDIP DC 50ns 20 mA 5000 V ac Yes - - 50ns
RS Stock No. 415-304
Mfr. Part No.TLP701(TP,F)
BrandToshiba
£1.59
Each (In a Pack of 2)
Units
Surface Mount Logic Gate 1.7V 1 6 SDIP DC 0.05µs - 5 kVrms Yes - - 0.05µs
RS Stock No. 582-133
Mfr. Part No.TLP250(LF1,F)
BrandToshiba
£2.22
Each
Units
Surface Mount - 1.8V 1 8 SMD DC - - 2.5 kVrms Yes - - -
RS Stock No. 625-8299
Mfr. Part No.TLP620-2(F)
BrandToshiba
£1.13
Each
Units
Through Hole Transistor 1.3V 2 8 PDIP AC 2µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 168-7412
Mfr. Part No.TLP124(BV,F)
BrandToshiba
£0.247
Each (On a Tape of 150)
Units
Surface Mount Transistor 1.3V 1 4 SOP AC, DC 8µs 50 mA 3.75 kVrms - 1200% 200 % 8µs
RS Stock No. 760-3154
Mfr. Part No.TLP124(BV,F)
BrandToshiba
£0.602
Each (In a Pack of 10)
Units
Surface Mount Transistor 1.3V 1 4 SOP AC, DC 8µs 50 mA 3750 V ac - 1200% 200 % 8µs
RS Stock No. 760-3158
Mfr. Part No.TLP124(BV-TPL,F)
BrandToshiba
£0.375
Each (In a Pack of 10)
Units
Surface Mount Transistor 1.3V 1 4 SOP AC, DC 8µs 50 mA 3750 V ac - 1200% 200 % 8µs