Optocoupler ICs

An optocoupler IC, 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 IC 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. 922-5860
Mfr. Part No.HCPL-7800-000E
BrandBroadcom
£6.28
Each (In a Tube of 50)
Units
Through Hole Transistor - 1 8 PDIP - 4.3µs - 3750 V ac Yes - - -
RS Stock No. 352-5467
Mfr. Part No.AQY210EH
BrandPanasonic
£1.34
Each
Units
Through Hole MOSFET 1.5V - 4 DIP DC - 50 mA 5 kVrms - - - -
RS Stock No. 166-2916
Mfr. Part No.HMHA281R2
£0.14
Each (On a Reel of 2500)
Units
Surface Mount Phototransistor 1.3V 1 4 MFP DC 3µs 50 mA 3.75 kVrms Yes 600% - 3µs
RS Stock No. 453-0684
Mfr. Part No.ISP827XB
BrandIsocom
£0.682
Each (In a Pack of 5)
Units
Through Hole Phototransistor 1.4V 2 8 PDIP DC 4µs 50 mA 5.3 kVrms - 260% 130 % 3µs
RS Stock No. 168-8541
Mfr. Part No.ISP827XB
BrandIsocom
£0.27
Each (In a Tube of 50)
Units
Through Hole Phototransistor 1.4V 2 8 PDIP DC 4µs 50 mA 5.3 kVrms - 260% 130 % 3µs
RS Stock No. 802-3256
Mfr. Part No.HMHA281R2
£0.388
Each (In a Pack of 20)
Units
Surface Mount Phototransistor 1.3V 1 4 MFP DC 3µs 50 mA 3750 Vrms Yes 600% - 3µs
RS Stock No. 880-1952
Mfr. Part No.OPI1264C
BrandOptek
£2.16
Each (In a Pack of 2)
Units
Through Hole NPN Phototransistor, Photosensor 1.6V - 4 - DC - 40 mA 10 Vrms - Minimum of 100% - -
RS Stock No. 170-0941
Mfr. Part No.OPI1264C
BrandOptek
£2.04
Each (In a Bag of 25)
Units
Through Hole NPN Phototransistor, Photosensor 1.6V - 4 - DC - 40 mA 15 kV dc Vrms - Minimum of 100% - -
RS Stock No. 691-2108
Mfr. Part No.LTV-816
BrandLite-On
£0.143
Each (In a Pack of 10)
Units
Through Hole Transistor 1.4V 1 4 PDIP DC 4µs 50 mA 5 kVrms - 320% 40 % 3µs
RS Stock No. 168-9659
Mfr. Part No.LTV-816
BrandLite-On
£0.122
Each (In a Tube of 100)
Units
Through Hole Transistor 1.4V 1 4 PDIP DC 4µs 50 mA 5 kVrms - 320% 40 % 3µs
RS Stock No. 695-6268
Mfr. Part No.TLP701(F)
BrandToshiba
£1.65
Each
Units
Surface Mount IC 1.75V 1 6 SDIP DC 50ns 20 mA 5000 V ac Yes - - 50ns
RS Stock No. 178-4756
Mfr. Part No.MOC3041M
£0.525
Each (In a Tube of 50)
Units
Through Hole Triac 1.5V 1 6 DIP DC - 60 mA 7.5 kVrms Yes - - -
RS Stock No. 415-304
Mfr. Part No.TLP701(TP,F)
BrandToshiba
£1.59
Each (In a Pack of 2)
Units
Surface Mount Logic Gate 1.7V 1 6 SDIP DC 0.05µs - 5 kVrms Yes - - 0.05µs
RS Stock No. 739-0252
Mfr. Part No.MOC3041M
£0.678
Each (In a Pack of 5)
Units
Through Hole Triac 1.5V 1 6 DIP DC - 60 mA 7500 V ac Yes - - -
RS Stock No. 453-7512
Mfr. Part No.PS2501-4
£2.26
Each
Units
Through Hole Transistor 1.4V 4 16 PDIP DC 3µs 80 mA 5000 Vrms - 600% 80 % 5µs
RS Stock No. 582-133
Mfr. Part No.TLP250(LF1,F)
BrandToshiba
£2.22
Each
Units
Surface Mount - 1.8V 1 8 SMD DC - - 2.5 kVrms Yes - - -
RS Stock No. 625-8299
Mfr. Part No.TLP620-2(F)
BrandToshiba
£1.13
Each
Units
Through Hole Transistor 1.3V 2 8 PDIP AC 2µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 165-4936
Mfr. Part No.4N35-X009T
BrandVishay
£0.221
Each (On a Reel of 1000)
Units
Surface Mount Phototransistor 1.7V 2 6 SMD DC 10µs 60 mA 5 kVrms - 50% - 10µs
RS Stock No. 453-0757
Mfr. Part No.ISP847XC
BrandIsocom
£0.874
Each (In a Pack of 5)
Units
Through Hole Transistor 1.4V 4 16 PDIP DC 4µs 50 mA 5.3 kVrms - 400% 200 % 3µs
RS Stock No. 902-6638
Mfr. Part No.4N35-X009T
BrandVishay
£0.446
Each (In a Pack of 25)
Units
Surface Mount Phototransistor 1.7V 2 6 SMD DC 10µs 60 mA 5000 Vrms - 50% - 10µs
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