Optocoupler ICs

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. 919-0067
Mfr. Part No.4N32
BrandVishay
TWD18.80
Each (In a Tube of 50)
units
Through Hole Darlington 1.5V 1 6 PDIP DC - 60 mA 5300 V ac - - 500 % -
RS Stock No. 699-8177
Mfr. Part No.CNY74-2H
BrandVishay
TWD26.70
Each (In a Pack of 10)
units
Through Hole Transistor 1.6V 2 8 PDIP DC 3µs 60 mA 5300 V ac - 600% 50 % 4.7µs
RS Stock No. 885-0960
Mfr. Part No.TLP291(GB,SE(T
BrandToshiba
TWD4.50
Each (In a Pack of 50)
units
Surface Mount Phototransistor 1.4V 1 4 SO4 DC 4µs 50 mA 3750 Vrms - 400% - 7µs
RS Stock No. 922-5668
Mfr. Part No.HCPL-7721-000E
BrandBroadcom
TWD156.70
Each (In a Tube of 50)
units
Through Hole Transistor 6.5V - 8 DIP DC 9ns 10 μA 3750 V ac Yes - - 8ns
RS Stock No. 922-6585
Mfr. Part No.HCPL-2631-300E
BrandBroadcom
TWD97.70
Each (In a Tube of 50)
units
Surface Mount Transistor 1.75V 2 8 DIP DC 24ns 20 mA 3750 V ac Yes 70% 70 % 10ns
RS Stock No. 178-3197
Mfr. Part No.HCPL-2211-000E
BrandBroadcom
TWD87.20
Each (In a Tube of 50)
units
Through Hole Logic Gate 1.85V 1 8 DIP - 30ns 230 mA 3.75 kVrms Yes - - 7ns
RS Stock No. 145-1761
Mfr. Part No.CNY74-2H
BrandVishay
TWD22.70
Each (In a Tube of 50)
units
Through Hole Transistor 1.6V 2 8 PDIP DC 3µs 60 mA 5.3 kVrms - 600% 50 % 4.7µs
RS Stock No. 922-5788
Mfr. Part No.HCPL-2611-000E
BrandBroadcom
TWD72.30
Each (In a Tube of 50)
units
Through Hole Transistor 1.75V 1 8 DIP DC 24ns 20 mA 3750 V ac Yes - - 10ns
RS Stock No. 922-5778
Mfr. Part No.HCPL-0600-000E
BrandBroadcom
TWD36.60
Each (In a Tube of 100)
units
Through Hole Transistor 1.75V 1 8 SOIC DC 24ns 20 mA 3750 V ac Yes - - 10ns
RS Stock No. 885-1045
Mfr. Part No.TLP293-4(GB,E(T
BrandToshiba
TWD44.60
Each (In a Pack of 10)
units
Surface Mount Phototransistor 1.4V 1 16 SOIC DC 2µs 50 mA 3.75 kVrms - 600% - 3µs
RS Stock No. 708-5281
Mfr. Part No.4N32
BrandVishay
TWD18.90
Each (In a Pack of 10)
units
Through Hole Darlington 1.5V 1 6 PDIP DC - 60 mA 5300 V ac - - 500 % -
RS Stock No. 178-3156
Mfr. Part No.HCPL-2531-000E
BrandBroadcom
TWD68.80
Each (In a Tube of 50)
units
Through Hole Transistor 1.7V 2 8 PDIP DC - 25 mA 5 kVrms Yes 50% 19 % -
RS Stock No. 178-4704
Mfr. Part No.H11N1M
TWD88.20
Each (In a Bag of 1000)
units
Through Hole Schmitt Trigger 2V 1 6 DIP DC 7.5ns 30 mA 7.5 kVrms Yes - - 12ns
RS Stock No. 453-7512
Mfr. Part No.PS2501-4
TWD107.00
Each
units
Through Hole Transistor 1.4V 4 16 PDIP DC 3µs 80 mA 5000 Vrms - 600% 80 % 5µs
RS Stock No. 796-5207
Mfr. Part No.TLP109
BrandToshiba
TWD41.00
Each (In a Pack of 5)
units
Surface Mount Transistor 1.85V 1 5 SOIC - - - 3750 Vrms - 20% - -
RS Stock No. 168-7593
Mfr. Part No.TLP3043(S,C,F)
BrandToshiba
TWD12.50
Each (In a Tube of 50)
units
Through Hole Triac 1.3V 1 5 PDIP DC - 50 mA 5 kVrms - - - -
RS Stock No. 168-7807
Mfr. Part No.TLP109
BrandToshiba
TWD23.20
Each (In a Tube of 125)
units
Surface Mount Transistor 1.85V 1 5 SOIC - - - 3.75 kVrms - 20% - -
RS Stock No. 168-9689
Mfr. Part No.MOC3052
BrandLite-On
TWD16.60
Each (In a Tube of 65)
units
Through Hole Triac 1.4V 1 6 PDIP - - 50 mA 5 kVrms - - - -
RS Stock No. 839-9995
Mfr. Part No.HCPL-2211-000E
BrandBroadcom
TWD116.00
Each (In a Pack of 2)
units
Through Hole Logic Gate 1.85V 1 8 DIP - 30ns 230 mA 3750 Vrms Yes - - 7ns
RS Stock No. 124-1744
Mfr. Part No.MOCD207R2M
TWD11.00
Each (On a Reel of 2500)
units
Surface Mount Transistor 1.55V 2 8 SOIC DC 1.6µs 60 mA 2500 V ac - 200% 100 % 2.2µs