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. 165-2468
Mfr. Part No.4N35
BrandVishay
£0.294
Each (In a Tube of 50)
Units
Through Hole Transistor 1.5V 1 6 PDIP DC - 50 mA 5 kVrms - 50% 40 % -
RS Stock No. 699-8155
Mfr. Part No.4N35
BrandVishay
£0.324
Each (In a Pack of 20)
Units
Through Hole Transistor 1.5V 1 6 PDIP DC - 50 mA 5000 V ac - 50% 40 % -
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. 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. 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. 168-9692
Mfr. Part No.MOC3063
BrandLite-On
£0.343
Each (In a Tube of 65)
Units
Through Hole Triac - 1 6 PDIP - - 50 mA 5 kVrms - - - -
RS Stock No. 691-2306
Mfr. Part No.MOC3063
BrandLite-On
£0.402
Each (In a Pack of 5)
Units
Through Hole Triac - 1 6 PDIP - - 50 mA 5 kVrms - - - -
RS Stock No. 699-8170
Mfr. Part No.CNY74-4H
BrandVishay
£1.314
Each (In a Pack of 5)
Units
Through Hole Transistor 1.6V 4 16 PDIP DC 3µs 60 mA 5300 V ac - 600% 50 % 4.7µs
RS Stock No. 145-1599
Mfr. Part No.CNY74-4H
BrandVishay
£0.98
Each (In a Tube of 25)
Units
Through Hole Transistor 1.6V 4 16 PDIP DC 3µs 60 mA 5.3 kVrms - 600% 50 % 4.7µs
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. 922-5633
Mfr. Part No.HCPL-3120-300E
BrandBroadcom
£1.392
Each (In a Tube of 50)
Units
Surface Mount Transistor 1.8V 1 8 DIP DC 0.1µs 16 mA 3750 V ac Yes - - 0.1µs
RS Stock No. 450-812
Mfr. Part No.HCPL-3120-300E
BrandBroadcom
£2.275
Each (In a Pack of 2)
Units
Surface Mount Transistor 1.8V 1 8 DIP DC 0.1µs 16 mA 3.75 kVrms Yes - - 0.1µs
RS Stock No. 168-9683
Mfr. Part No.MOC3021
BrandLite-On
£0.265
Each (In a Tube of 65)
Units
Through Hole Triac - 1 6 PDIP - - 50 mA 5 kVrms - - - -
RS Stock No. 691-2265
Mfr. Part No.MOC3021
BrandLite-On
£0.382
Each (In a Pack of 5)
Units
Through Hole Triac - 1 6 PDIP - - 50 mA 5 kVrms - - - -
RS Stock No. 691-2205
Mfr. Part No.LTV-827
BrandLite-On
£0.312
Each (In a Pack of 5)
Units
Through Hole Transistor 1.4V 2 8 PDIP DC 4µs 50 mA 5 kVrms - 600% 50 % 3µs
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. 885-1424
Mfr. Part No.TLP175A(E(T
BrandToshiba
£0.699
Each (In a Pack of 10)
Units
- - - - - - - - - - - - - -
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. 168-9673
Mfr. Part No.LTV-827
BrandLite-On
£0.251
Each (In a Tube of 50)
Units
Through Hole Transistor 1.4V 2 8 PDIP DC 4µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 165-1742
Mfr. Part No.KB814-B
BrandKingbright
£0.188
Each (On a Reel of 1000)
Units
Surface Mount Transistor 1.4V 1 4 SMD AC 4µs 50 mA 5 kVrms - 300% 120 % 3µs
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