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. 315-775
Mfr. Part No.S2S4BY0F
BrandSharp
£1.256
Each (In a Pack of 5)
Units
Surface Mount Triac - 1 4 Mini-Flat - - 50 mA 3.75 kVrms - - - -
RS Stock No. 170-2389
Mfr. Part No.S2S4BY0F
BrandSharp
£0.531
Each (On a Reel of 750)
Units
Surface Mount Triac - 1 4 Mini-Flat - - 50 mA 3.75 kVrms - - - -
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. 902-6638
Mfr. Part No.4N35-X009T
BrandVishay
£0.415
Each (In a Pack of 25)
Units
Surface Mount Phototransistor 1.7V 2 6 SMD DC 10µs 60 mA 5000 Vrms - 50% - 10µs
RS Stock No. 165-4936
Mfr. Part No.4N35-X009T
BrandVishay
£0.187
Each (On a Reel of 1000)
Units
Surface Mount Phototransistor 1.7V 2 6 SMD DC 10µs 60 mA 5 kVrms - 50% - 10µs
RS Stock No. 453-0757
Mfr. Part No.ISP847XC
BrandIsocom
£0.874
Each (In a Pack of 5)
Units
Through Hole Transistor 1.4V 4 16 PDIP DC 4µs 50 mA 5.3 kVrms - 400% 200 % 3µs
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. 453-1687
Mfr. Part No.CNY17-3X
BrandIsocom
£0.50
Each (In a Pack of 10)
Units
Through Hole Transistor 1.65V - 6 DIP - 2µs 60 mA 5.3 kVrms - 200% 200 % 2µs
RS Stock No. 192-5354
Mfr. Part No.SFH618A-2
BrandVishay
£0.174
Each (In a Pack of 5)
Units
Through Hole Transistor 1.25V 1 4 PDIP DC 3µs 60 mA 5300 Vrms - 125% 63 % 14µs
RS Stock No. 708-5409
Mfr. Part No.ILQ74
BrandVishay
£3.078
Each (In a Pack of 5)
Units
Through Hole Transistor 1.5V 4 16 PDIP DC - 60 mA 5300 V ac - 35% 12.5 % -
RS Stock No. 165-2475
Mfr. Part No.SFH618A-2
BrandVishay
£0.175
Each (In a Tube of 100)
Units
Through Hole Transistor 1.25V 1 4 PDIP DC 3µs 60 mA 5.3 kVrms - 125% 63 % 14µs
RS Stock No. 919-0121
Mfr. Part No.ILQ74
BrandVishay
£2.264
Each (In a Tube of 25)
Units
Through Hole Transistor 1.5V 4 16 PDIP DC - 60 mA 5300 V ac - 35% 12.5 % -
RS Stock No. 178-4827
Mfr. Part No.H11L1M
£0.238
Each (In a Bag of 1000)
Units
Through Hole Logic Gate 1.5V - 6 DIP DC 0.1µs 60 mA 7.5 kVrms Yes - - 0.1µs
RS Stock No. 168-8557
Mfr. Part No.CNY17-3X
BrandIsocom
£0.274
Each (In a Tube of 65)
Units
Through Hole Transistor 1.65V - 6 DIP - 2µs 60 mA 5.3 kVrms - 200% 200 % 2µs
RS Stock No. 671-1393
Mfr. Part No.H11L1M
£0.608
Each (In a Pack of 5)
Units
Through Hole Logic Gate 1.5V - 6 DIP DC 0.1µs 60 mA 7.5 kVrms Yes - - 0.1µs
RS Stock No. 922-6484
Mfr. Part No.HCNW3120-300E
BrandBroadcom
£2.048
Each (In a Tube of 42)
Units
Surface Mount IGBT Gate Drive, MOSFET 1.95V 1 8 DIP DC 500ns 16 mA 5000 Vrms Yes - - 500ns
RS Stock No. 818-8307
Mfr. Part No.HCNW3120-300E
BrandBroadcom
£2.745
Each (In a Pack of 2)
Units
Surface Mount IGBT Gate Drive, MOSFET 1.95V 1 8 DIP DC 500ns 16 mA 5000 Vrms Yes - - 500ns
RS Stock No. 671-1419
Mfr. Part No.HCPL2630
£1.59
Each
Units
Through Hole Logic Gate 1.8V 1 8 DIP DC 50ns 50 mA 2.5 kVrms Yes - - 12ns
RS Stock No. 161-1020
Mfr. Part No.MOC3041
BrandIsocom
£0.291
Each (In a Tube of 65)
Units
Through Hole Triac 1.4V 1 6 DIP AC - 50 mA 5300 (Minimum) Vrms - - - -
RS Stock No. 124-1738
Mfr. Part No.HCPL2630
£1.352
Each (In a Tube of 50)
Units
Through Hole Logic Gate 1.8V 1 8 DIP DC 50ns 50 mA 2500 V ac Yes - - 12ns
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