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. 145-5525
Mfr. Part No.4N35M
HK$1.87
Each (In a Bag of 1000)
units
Through Hole Transistor 1.5V 1 6 PDIP DC - 60 mA 7.5 kVrms - - 100 % -
RS Stock No. 671-1352
Mfr. Part No.4N35M
HK$4.77
Each (In a Pack of 5)
units
Through Hole Transistor 1.5V 1 6 PDIP DC - 60 mA 7.5 kVrms - - 100 % -
RS Stock No. 169-8557
Mfr. Part No.FOD817A300
HK$1.019
Each (In a Bag of 2000)
units
Through Hole Transistor 70V 1 4 DIP-B DC 18µs 50 mA 5 kVrms - 160% - 18µs
RS Stock No. 739-0265
Mfr. Part No.FOD817A300
HK$3.122
Each (In a Pack of 5)
units
Through Hole Transistor 70V 1 4 DIP-B DC 18µs 50 mA 5000 Vrms - 160% - 18µs
RS Stock No. 166-2444
Mfr. Part No.MOC3083M
HK$3.478
Each (In a Bag of 1000)
units
Through Hole Triac 1.5V 1 6 DIP DC - 60 mA 7.5 kVrms - - - -
RS Stock No. 671-1444
Mfr. Part No.MOC3062M
HK$6.848
Each (In a Pack of 5)
units
Through Hole Triac - 1 6 PDIP - - 60 mA 7.5 kVrms - - - -
RS Stock No. 903-4267
Mfr. Part No.HCPL2531S
HK$10.602
Each (In a Pack of 5)
units
Surface Mount Phototransistor 1.7V 2 8 DIP DC - 50 mA 2500 Vrms Yes 50% - -
RS Stock No. 169-8548
Mfr. Part No.MOC3062M
HK$3.87
Each (In a Bag of 1000)
units
Through Hole Triac - 1 6 PDIP - - 60 mA 7.5 kVrms - - - -
RS Stock No. 166-2236
Mfr. Part No.HCPL2531S
HK$10.136
Each (In a Bag of 1000)
units
Surface Mount Phototransistor 1.8V 2 8 MDIP DC 1.5µs 25 mA 2.5 kVrms Yes 50% - 1.5µs
RS Stock No. 739-0256
Mfr. Part No.MOC3083M
HK$8.044
Each (In a Pack of 5)
units
Through Hole Triac 1.5V 1 6 DIP DC - 60 mA 7500 V ac - - - -
RS Stock No. 807-6651
Mfr. Part No.HCPL2531SD
HK$11.796
Each (In a Pack of 5)
units
Surface Mount Phototransistor 1.8V 2 8 MDIP DC 1.5µs 25 mA 2500 V ac Yes 50% - 1.5µs
RS Stock No. 166-2381
Mfr. Part No.HCPL2531SD
HK$9.645
Each (On a Reel of 1000)
units
Surface Mount Phototransistor 1.8V 2 8 MDIP DC 1.5µs 25 mA 2.5 kVrms Yes 50% - 1.5µs
RS Stock No. 864-9136
Mfr. Part No.FOD3180TV
HK$14.386
Each (In a Pack of 5)
units
Through Hole MOSFET Gate Driver 1.8V 1 8 DIP - 75ns 25 mA 5000 Vrms - - - 55ns
RS Stock No. 166-1895
Mfr. Part No.FOD817B3SD
HK$1.145
Each (On a Reel of 1000)
units
Surface Mount Phototransistor 1.4V 1 4 MDIP DC 18µs 50 mA 5 kVrms - 260% - 18µs
RS Stock No. 761-3521
Mfr. Part No.FOD817B3SD
HK$1.241
Each (On a Tape of 25)
units
Surface Mount Phototransistor 1.4V 1 4 DIP DC 4µs 50 mA 5000 V ac - 260% - 3µs
RS Stock No. 671-1419
Mfr. Part No.HCPL2630
HK$22.80
Each
units
Through Hole Logic Gate 1.8V 1 8 DIP DC 50ns 50 mA 2.5 kVrms Yes - - 12ns
RS Stock No. 124-1738
Mfr. Part No.HCPL2630
HK$15.973
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
RS Stock No. 903-4213
Mfr. Part No.FOD817BSD
HK$1.282
Each (In a Pack of 50)
units
Surface Mount Phototransistor 1.4V 1 4 PDIP AC 4µs - 5000 V ac Yes 600% - 3µs
RS Stock No. 169-8707
Mfr. Part No.4N35TVM
HK$2.007
Each (In a Bag of 1000)
units
Through Hole Transistor 1.5V 1 6 DIP DC 2µs 3 A 7.5 kVrms Yes 100% - 2µs
RS Stock No. 166-3243
Mfr. Part No.FODM8061R2
HK$7.329
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