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. 759-9355
Mfr. Part No.HCPL2601
$2.61
Each (In a Pack of 2)
units
Through Hole Logic Gate 1.8V 1 8 DIP DC 50ns 50 mA 2500 V ac Yes - - 12ns
RS Stock No. 166-1702
Mfr. Part No.HCPL2601
$1.57
Each (In a Bag of 1000)
units
Through Hole Logic Gate 1.8V 1 8 DIP DC 50ns 50 mA 2.5 kVrms Yes - - 12ns
RS Stock No. 166-1859
Mfr. Part No.FOD0721
$5.39
Each (In a Tube of 50)
units
Surface Mount Logic Gate 6.5V - 8 SOIC DC 5ns 10 μA 3.75 kVrms Yes - - 4.8ns
RS Stock No. 739-4951
Mfr. Part No.FOD0721
$5.45
Each
units
Surface Mount Logic Gate 6.5V - 8 SOIC DC 5ns 10 μA 3750 V ac Yes - - 4.8ns
RS Stock No. 806-6042
Mfr. Part No.MOC3043TVM
$1.408
Each (In a Pack of 10)
units
Through Hole Triac 1.5V 1 6 DIP AC - 60 mA 7500 V ac Yes - - -
RS Stock No. 862-9381
Mfr. Part No.MID400S
$4.282
Each (In a Pack of 5)
units
Surface Mount Open Collector 1.5V 1 8 DIP AC 1ms - 2.5 kVrms Yes - - 1ms
RS Stock No. 739-0268
Mfr. Part No.4N25M
$0.816
Each (In a Pack of 5)
units
Through Hole Transistor 1.5V 1 6 DIP-W DC 2µs - 4170 Vrms - - - 2µs
RS Stock No. 178-4830
Mfr. Part No.4N25M
$0.30
Each (In a Bag of 1000)
units
Through Hole Transistor 1.5V 1 6 DIP-W DC 2µs - 4.17 kVrms - - - 2µs
RS Stock No. 166-2128
Mfr. Part No.MID400S
$3.445
Each (In a Bag of 1000)
units
Surface Mount Logic Gate 1.5V 2 8 MDIP AC, DC 1ms - 2.5 kVrms Yes - - 1ms
RS Stock No. 166-3059
Mfr. Part No.4N29SM
$0.575
Each (In a Bag of 1000)
units
Surface Mount Darlington 1.5V 1 6 DIP DC 5µs 3 A 7.5 kVrms Yes 100% - 40µs
RS Stock No. 169-8585
Mfr. Part No.FOD817A
$0.214
Each (In a Bag of 2000)
units
Through Hole Phototransistor 1.4V 1 4 DIP DC 4µs 50 mA 5 kVrms - 160% - 3µs
RS Stock No. 806-4169
Mfr. Part No.MID400SD
$4.14
Each (In a Pack of 2)
units
Surface Mount Logic Gate 1.5V 2 8 MDIP AC, DC 1ms - 2500 Vrms Yes - - 1ms
RS Stock No. 166-2117
Mfr. Part No.MOC3043TVM
$0.996
Each (In a Bag of 1000)
units
Through Hole Triac 1.5V 1 6 DIP AC - 60 mA 7.5 kVrms Yes - - -
RS Stock No. 761-4439
Mfr. Part No.FOD817A
$0.444
Each (In a Pack of 10)
units
Through Hole Phototransistor 1.4V 1 4 DIP DC 4µs 50 mA 5000 V ac - 160% - 3µs
RS Stock No. 166-2052
Mfr. Part No.MID400SD
$4.835
Each (On a Reel of 1000)
units
Surface Mount Logic Gate 1.5V 2 8 MDIP AC, DC 1ms - 2.5 kVrms Yes - - 1ms
RS Stock No. 805-1182
Mfr. Part No.4N29SM
$1.111
Each (In a Pack of 25)
units
Surface Mount Darlington 1.5V 1 6 DIP DC 5µs 3 A 7500 Vrms Yes 100% - 40µs
RS Stock No. 169-8557
Mfr. Part No.FOD817A300
$0.213
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. 671-1419
Mfr. Part No.HCPL2630
$4.80
Each
units
Through Hole Logic Gate 1.8V 1 8 DIP DC 50ns 50 mA 2.5 kVrms Yes - - 12ns
RS Stock No. 739-0265
Mfr. Part No.FOD817A300
$0.73
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. 124-1738
Mfr. Part No.HCPL2630
$2.646
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