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. 166-2230
Mfr. Part No.FOD8523S
MYR1.896
Each (In a Bag of 2000)
units
Surface Mount Darlington 1.4V 1 4 MDIP DC 300µs 50 mA 5 kVrms - 15000% - 100µs
RS Stock No. 808-8840
Mfr. Part No.FOD8523S
MYR3.332
Each (In a Pack of 10)
units
Surface Mount Darlington 1.4V 1 4 MDIP DC 300µs 50 mA 5000 Vrms - 15000% - 100µs
RS Stock No. 166-2219
Mfr. Part No.FOD8523SD
MYR1.628
Each (On a Reel of 1000)
units
Surface Mount Darlington 1.4V 1 4 MDIP DC 300µs 50 mA 5 kVrms - 15000% - 100µs
RS Stock No. 699-8155
Mfr. Part No.4N35
BrandVishay
MYR1.672
Each (In a Pack of 20)
units
Through Hole Transistor 1.5V 1 6 PDIP DC - 50 mA 5000 V ac - 50% 40 % -
RS Stock No. 178-3156
Mfr. Part No.HCPL-2531-000E
BrandBroadcom
MYR8.894
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. 811-6172
Mfr. Part No.4N37
BrandVishay
MYR2.369
Each (In a Pack of 10)
units
Through Hole Transistor 1.5V 1 6 DIP DC 10µs 50 mA 5000 Vrms - 50% - 10µs
RS Stock No. 756-3498
Mfr. Part No.TLP531(GR,F)
BrandToshiba
MYR3.78
Each (In a Pack of 5)
units
Through Hole Phototransistor 1.3V 1 6 DIP DC 2µs 25 mA 2500 V ac - 300% 50 % 3µs
RS Stock No. 168-8557
Mfr. Part No.CNY17-3X
BrandIsocom
MYR1.813
Each (In a Tube of 65)
units
Through Hole Transistor 1.65V - 6 DIP - 2µs 60 mA 5.3 kVrms - 200% 200 % 2µs
RS Stock No. 691-2233
Mfr. Part No.LTV-847
BrandLite-On
MYR3.585
Each (In a Pack of 2)
units
Through Hole Transistor 1.4V 4 16 PDIP DC 4µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 547-4153
Mfr. Part No.HCPL-7840-000E
BrandBroadcom
MYR28.41
Each
units
Through Hole Transistor - 1 8 PDIP - 3.4µs - 3.75 kVrms Yes - - -
RS Stock No. 691-2120
Mfr. Part No.LTV-817A
BrandLite-On
MYR1.05
Each (In a Pack of 10)
units
Through Hole Transistor 1.4V 1 4 PDIP DC 4µs 50 mA 5 kVrms - 160% 80 % 3µs
RS Stock No. 547-3879
Mfr. Part No.HCPL-2531-000E
BrandBroadcom
MYR12.57
Each
units
Through Hole Transistor 1.7V 2 8 PDIP DC - 25 mA 5 kVrms Yes 50% 19 % -
RS Stock No. 127-8463
Mfr. Part No.LTV-817S-TA1
BrandLite-On
MYR0.867
Each (In a Pack of 50)
units
Surface Mount Transistor 1.4V 1 4 PDIP DC 4µs 50 mA 5000 Vrms - 600% - 3µs
RS Stock No. 839-9979
Mfr. Part No.HCNW4504-300E
BrandBroadcom
MYR12.525
Each (In a Pack of 2)
units
Surface Mount Phototransistor 1.95V 1 8 DIP DC - 400 mA 5000 Vrms Yes 68% - -
RS Stock No. 818-8259
Mfr. Part No.ACPL-227-50BE
BrandBroadcom
MYR2.66
Each (In a Pack of 10)
units
Surface Mount Phototransistor 1.4V 1 8 SOIC DC 2µs 5 mA 3000 Vrms - 260% - 3µs
RS Stock No. 178-1570
Mfr. Part No.ACPL-244-500E
BrandBroadcom
MYR4.228
Each (On a Reel of 2000)
units
Surface Mount Transistor 1.4V 4 16 SOIC AC 2µs 50 mA 3 kVrms - 400% 20 % 3µs
RS Stock No. 178-0898
Mfr. Part No.CNY17F-2
BrandVishay
MYR1.505
Each (In a Tube of 65)
units
Through Hole Phototransistor 1.65V 1 6 PDIP DC 3µs 60 mA 5.3 kVrms - 125% 63 % 14µs
RS Stock No. 799-5270
Mfr. Part No.TLP185(BL,SE(T
BrandToshiba
MYR0.749
Each (In a Pack of 25)
units
Surface Mount Phototransistor 1.4V 1 4 SO6 DC 5µs 1 A 3750 Vrms - 400% - 9µs
RS Stock No. 178-3130
Mfr. Part No.HCNW4504-300E
BrandBroadcom
MYR9.419
Each (In a Tube of 42)
units
Surface Mount Phototransistor 1.95V 1 8 DIP DC - 400 mA 5 kVrms Yes 68% - -
RS Stock No. 453-7528
Mfr. Part No.PS2501L-1
MYR4.06
Each
units
Surface Mount Transistor 1.4V 1 4 SMT DC 3µs 80 mA 5000 Vrms - 600% 80 % 5µs