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. 671-1444
Mfr. Part No.MOC3062M
TWD37.40
Each (In a Pack of 5)
units
Through Hole Triac - 1 6 PDIP - - 60 mA 7.5 kVrms - - - -
RS Stock No. 691-2328
Mfr. Part No.6N138-L
BrandLite-On
TWD37.20
Each (In a Pack of 5)
units
Through Hole Phototransistor 1.7V 1 8 DIP DC - 20 mA 5 kVrms Yes 2600% 2000 % -
RS Stock No. 166-1706
Mfr. Part No.HCPL2731
TWD31.40
Each (In a Bag of 1000)
units
Through Hole Transistor 1.75V 2 8 MDIP DC 22µs 20 mA 2.5 kVrms Yes 2000% - 3µs
RS Stock No. 166-2235
Mfr. Part No.HCPL2611
TWD28.60
Each (In a Bag of 1000)
units
Through Hole Photodetector 1.8V 1 8 PDIP DC 50ns 50 mA 2.5 kVrms Yes - - 12ns
RS Stock No. 885-1250
Mfr. Part No.TLP151A(E(O
BrandToshiba
TWD54.50
Each (In a Pack of 10)
units
Surface Mount Photo IC 1.7V 1 5 SO6 - 50ns 25 mA 3750 Vrms Yes - - 50ns
RS Stock No. 903-4232
Mfr. Part No.FODM8061R2
TWD55.60
Each (In a Pack of 10)
units
Surface Mount Schottky-Clamped Transistor 1.8V 1 5 Mini-Flat DC 20ns 50 mA 3750 V ac Yes - - 10ns
RS Stock No. 178-3183
Mfr. Part No.HCPL-3150-300E
BrandBroadcom
TWD64.10
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 826-4684
Mfr. Part No.PC357NJ0000F
BrandSharp
TWD16.40
Each (In a Pack of 40)
units
- - 1.4V - - - - - 50 mA 3.75 kV - - - -
RS Stock No. 168-9692
Mfr. Part No.MOC3063
BrandLite-On
TWD15.60
Each (In a Tube of 65)
units
Through Hole Triac - 1 6 PDIP - - 50 mA 5 kVrms - - - -
RS Stock No. 168-7927
Mfr. Part No.PC357NJ0000F
BrandSharp
TWD8.00
Each (On a Reel of 3000)
units
- - 1.4V - - - - - 50 mA 3.75 kVrms - - - -
RS Stock No. 761-4530
Mfr. Part No.MOCD217R2M
TWD34.60
Each (In a Pack of 5)
units
Surface Mount Transistor 1.3V 2 8 SOIC DC 3.2µs 60 mA 2500 V ac - 130% 100 % 4.7µs
RS Stock No. 168-9696
Mfr. Part No.6N138-L
BrandLite-On
TWD15.60
Each (In a Tube of 50)
units
Through Hole Phototransistor 1.7V 1 8 DIP DC - 20 mA 5 kVrms Yes 2600% 2000 % -
RS Stock No. 166-3243
Mfr. Part No.FODM8061R2
TWD25.60
Each (On a Reel of 2500)
units
Surface Mount Schottky-Clamped Transistor 1.8V 1 5 Mini-Flat DC 20ns 50 mA 3.75 kVrms Yes - - 10ns
RS Stock No. 818-8344
Mfr. Part No.HCPL-3150-300E
BrandBroadcom
TWD93.50
Each (In a Pack of 2)
units
Surface Mount IGBT Gate Drive 1.95V 1 8 DIP DC 0.1µs 16 mA 3750 Vrms Yes - - 0.1µs
RS Stock No. 922-4810
Mfr. Part No.HCPL-3120-000E
BrandBroadcom
TWD102.40
Each (In a Pack of 5)
units
- - 1.8V - - - - - 16 mA 3750 Vrms - - - -
RS Stock No. 917-5532
Mfr. Part No.MOCD217M
TWD27.80
Each (In a Pack of 10)
units
Surface Mount Phototransistor 1.3V 2 8 SOIC DC 3.2µs 200 mA 2500 V ac Yes 100% - 4.7µs
RS Stock No. 691-2259
Mfr. Part No.MOC3020
BrandLite-On
TWD17.20
Each (In a Pack of 5)
units
Through Hole Triac - 1 6 PDIP - - 50 mA 5 kVrms - - - -
RS Stock No. 708-5405
Mfr. Part No.ILQ621GB
BrandVishay
TWD100.80
Each (In a Pack of 5)
units
Through Hole Transistor 1.3V 4 16 PDIP DC 2.8µs 60 mA 5300 V ac - 600% 100 % 11µs
RS Stock No. 691-2306
Mfr. Part No.MOC3063
BrandLite-On
TWD18.00
Each (In a Pack of 5)
units
Through Hole Triac - 1 6 PDIP - - 50 mA 5 kVrms - - - -
RS Stock No. 761-3640
Mfr. Part No.HCPL2731
TWD78.50
Each (In a Pack of 2)
units
Through Hole Transistor 1.75V 2 8 MDIP DC 22µs 20 mA 2500 V ac Yes 2000% - 3µs