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. 173-2229
Mfr. Part No.K1010 B
BrandCosmo
£0.155
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
£0.222
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. 597-302
Mfr. Part No.4N35
BrandIsocom
£0.53
Each
Units
Through Hole Transistor 1.5V 1 6 PDIP DC 2µs 60 mA 5.3 kVrms - - 40 % 2µs
RS Stock No. 691-2233
Mfr. Part No.LTV-847
BrandLite-On
£0.645
Each (In a Pack of 2)
Units
Through Hole Transistor 1.4V 4 16 PDIP DC 4µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 168-9679
Mfr. Part No.LTV-847
BrandLite-On
£0.536
Each (In a Tube of 25)
Units
Through Hole Transistor 1.4V 4 16 PDIP DC 4µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 632-4857
Mfr. Part No.PS2502-4-A
£2.89
Each
Units
Through Hole Darlington 1.4V 4 16 PDIP DC 100µs 80 mA 5000 Vrms - 2000% 200 % 100µs
RS Stock No. 168-6126
Mfr. Part No.PS2502-4-A
£2.387
Each (In a Tube of 20)
Units
Through Hole Darlington 1.4V 4 16 PDIP DC 100µs 80 mA 5 kVrms - 2000% 200 % 100µs
RS Stock No. 284-1190
Mfr. Part No.SFH6156-2T
BrandVishay
£0.78
Each
Units
Surface Mount Transistor 1.25V 1 4 SMD DC 3µs 60 mA 5300 Vrms - 125% 63 % 14µs
RS Stock No. 159-6455
Mfr. Part No.SFH6156-2T
BrandVishay
£0.264
Each (On a Reel of 1000)
Units
Surface Mount Transistor 1.25V 1 4 SMD DC 3µs 60 mA 5.3 kVrms - 125% 63 % 14µs
RS Stock No. 625-8413
Mfr. Part No.TLP251(F)
BrandToshiba
£1.36
Each
Units
Through Hole Buffer, Totem-Pole 1.8V 1 8 PDIP DC - 10 mA 2.5 kVrms Yes - - -
RS Stock No. 177-4798
Mfr. Part No.TLP251(F)
BrandToshiba
£0.828
Each (In a Tube of 20)
Units
- - - - - - - - - - - - - -
RS Stock No. 145-1578
Mfr. Part No.SFH615A-2
BrandVishay
£0.244
Each (In a Tube of 100)
Units
Through Hole Transistor 1.65V 1 4 PDIP DC 3µs 60 mA 5.3 kVrms - 125% 63 % 14µs
RS Stock No. 110-185
Mfr. Part No.SFH615A-2
BrandVishay
£0.70
Each
Units
Through Hole Transistor 1.65V 1 4 PDIP DC 3µs 60 mA 5.3 kVrms - 125% 63 % 14µs
RS Stock No. 691-2120
Mfr. Part No.LTV-817A
BrandLite-On
£0.193
Each (In a Pack of 10)
Units
Through Hole Transistor 1.4V 1 4 PDIP DC 4µs 50 mA 5 kVrms - 160% 80 % 3µs
RS Stock No. 168-9662
Mfr. Part No.LTV-817A
BrandLite-On
£0.156
Each (In a Tube of 100)
Units
Through Hole Transistor 1.4V 1 4 PDIP DC 4µs 50 mA 5 kVrms - 160% 80 % 3µs
RS Stock No. 693-6807
Mfr. Part No.ACPL-247-500E
BrandBroadcom
£1.586
Each (In a Pack of 5)
Units
Surface Mount Transistor 1.4V 4 16 SOIC DC 2µs 50 mA 3 kVrms - 600% 100 % 3µs
RS Stock No. 178-1571
Mfr. Part No.ACPL-247-500E
BrandBroadcom
£0.639
Each (On a Reel of 2000)
Units
Surface Mount Phototransistor 1.4V 2 16 SO DC 2µs 5 mA 3.75 kV - 600% 100 % 3µs
RS Stock No. 170-0764
Mfr. Part No.OPI 1264B
BrandOptek
£2.068
Each (In a Bag of 25)
Units
Through Hole Transistor 1.6V 1 4 - DC - 40 mA 10 kV dc - - 50 % -
RS Stock No. 817-224
Mfr. Part No.ISQ203
BrandIsocom
£2.01
Each
Units
Through Hole Transistor 1.65V 4 16 PDIP DC - 50 mA 5.3 kVrms - 450% 225 % -
RS Stock No. 168-8534
Mfr. Part No.ISQ203
BrandIsocom
£1.074
Each (In a Tube of 25)
Units
Through Hole Transistor 1.65V 4 16 PDIP DC - 50 mA 5.3 kVrms - 450% 225 % -