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. 171-2981
Mfr. Part No.MOC3043X V2
BrandIsocom
$0.80
Each (In a Tube of 65)
units
Through Hole Phototriac 1.4V 1 6 DIP - - 50 (Forward) mA 5.3 kVrms, 7500 V Pk - - - -
RS Stock No. 166-1859
Mfr. Part No.FOD0721
$5.049
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. 168-9672
Mfr. Part No.LTV-826
BrandLite-On
$0.532
Each (In a Tube of 50)
units
Through Hole Transistor 1.4V 2 8 PDIP DC 4µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 168-9674
Mfr. Part No.LTV-827S-TA1
BrandLite-On
$0.292
Each (On a Reel of 1000)
units
Surface Mount Transistor 1.4V 2 8 PDIP DC 4µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 125-7579
Mfr. Part No.LTV-827S
BrandLite-On
$0.493
Each (In a Tube of 50)
units
Surface Mount - 1.4V 2 8 PDIP DC - 50 mA 5000 Vrms - - - -
RS Stock No. 691-2209
Mfr. Part No.LTV-827S-TA1
BrandLite-On
$0.564
Each (In a Pack of 5)
units
Surface Mount Transistor 1.4V 2 8 PDIP DC 4µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 739-4951
Mfr. Part No.FOD0721
$5.24
Each
units
Surface Mount Logic Gate 6.5V - 8 SOIC DC 5ns 10 μA 3750 V ac Yes - - 4.8ns
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. 806-4169
Mfr. Part No.MID400SD
$4.555
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. 739-0268
Mfr. Part No.4N25M
$0.636
Each (In a Pack of 5)
units
Through Hole Transistor 1.5V 1 6 DIP-W DC 2µs - 4170 Vrms - - - 2µs
RS Stock No. 760-3202
Mfr. Part No.TLP2531(F)
BrandToshiba
$2.312
Each (In a Pack of 5)
units
Through Hole Transistor 1.7V 2 8 DIP DC 0.3µs 25 mA 2500 V ac Yes 30% 19 % 0.3µs
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. 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. 799-5315
Mfr. Part No.TLP2630(F)
BrandToshiba
$3.605
Each (In a Pack of 2)
units
Through Hole Transistor 1.75V 1 8 DIP AC 30ns 5 mA 2500 Vrms Yes - - 30ns
RS Stock No. 100-0151
Mfr. Part No.TLP250(F)
BrandToshiba
$3.272
Each (In a Pack of 5)
units
Through Hole Transistor 1.3V 1 8 PDIP DC 2µs 300 mA 2500 V ac Yes - - -
RS Stock No. 145-1981
Mfr. Part No.VO610A-2
BrandVishay
$0.28
Each (In a Tube of 100)
units
Through Hole Phototransistor 1.6V 1 4 DIP DC 3µs 60 mA 5 kVrms - 125% - 4.7µs
RS Stock No. 773-3671
Mfr. Part No.VO610A-2
BrandVishay
$0.284
Each (In a Bag of 5)
units
Through Hole Phototransistor 1.6V 1 4 DIP DC 3µs 60 mA 5000 Vrms - 125% - 4.7µs
RS Stock No. 168-7421
Mfr. Part No.TLP2531(F)
BrandToshiba
$2.69
Each (In a Tube of 50)
units
Through Hole Transistor 1.7V 2 8 DIP DC 0.3µs 25 mA 2.5 kVrms Yes 30% 19 % 0.3µs
RS Stock No. 806-6042
Mfr. Part No.MOC3043TVM
$1.478
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. 453-1126
Mfr. Part No.MOC3061X
BrandIsocom
$1.167
Each (In a Pack of 10)
units
Through Hole Phototriac - 1 6 PDIP - - 50 mA 5.3 kVrms - - - -
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