Optocouplers

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. 915-9707
Mfr. Part No.PC817X2NSZ0F
BrandSharp
TWD8
Each (In a Tube of 100)
Through Hole Transistor 1.4V 1 4 PDIP DC - 50 mA 5 kV - - - -
RS Stock No. 815-1030
Mfr. Part No.6N136
BrandVishay
TWD37
Each (In a Pack of 10)
Through Hole Transistor 1.9V 1 8 DIP DC - 25 mA 5300 Vrms - 35% - -
RS Stock No. 100-0151
Mfr. Part No.TLP250(F)
BrandToshiba
TWD71
Each (In a Pack of 5)
Through Hole Transistor 1.3V 1 8 PDIP DC 2µs 300 mA 2500 V ac Yes - - -
RS Stock No. 625-8249
Mfr. Part No.TLP127(U,F)
BrandToshiba
TWD41
Each
Surface Mount Darlington 1.3V 1 4 SOP DC 40µs 50 mA 2.5 kVrms - 4000% 1000 % 15µs
RS Stock No. 885-1180
Mfr. Part No.TLP2105(F)
BrandToshiba
TWD140
Each (In a Pack of 5)
Surface Mount Photo IC 1.75V 1 8 SOIC - 75ns 20 mA 2500 Vrms Yes - - 75ns
RS Stock No. 453-7499
Mfr. Part No.PS2501-1
TWD27
Each
Through Hole Transistor 1.4V 1 4 PDIP DC 3µs 80 mA 5000 Vrms - 600% 80 % 5µs
RS Stock No. 808-8730
Mfr. Part No.FOD3184
TWD90
Each (In a Pack of 2)
Through Hole Buffer, Totem-Pole 1.8V 1 8 MDIP DC 38ns 25 mA 5000 Vrms - - - 24ns
RS Stock No. 315-668
Mfr. Part No.PC457L0NIP0F
BrandSharp
TWD74
Each (In a Pack of 5)
Surface Mount Transistor 1.95V 1 5 Mini-Flat DC - 25 mA 3.75 kVrms - 50% 19 % -
RS Stock No. 807-6654
Mfr. Part No.HCPL2631SD
TWD88
Each (In a Pack of 4)
Surface Mount Logic Gate 1.8V 2 8 MDIP DC 50µs 30 mA 2500 Vrms Yes - - 12µs
RS Stock No. 632-4857
Mfr. Part No.PS2502-4-A
TWD114
Each
Through Hole Darlington 1.4V 4 16 PDIP DC 100µs 80 mA 5000 Vrms - 2000% 200 % 100µs
RS Stock No. 667-5073
Mfr. Part No.PC123X1YFZ0F
BrandSharp
TWD16
Each (In a Pack of 10)
Through Hole Transistor 1.4V 1 4 PDIP DC 4µs 50 mA 5 kVrms - 400% 50 % 3µs
RS Stock No. 768-7862
Mfr. Part No.ACPL-M72T-000E
BrandBroadcom
TWD82
Each
Surface Mount CMOS Detector IC 1.85V 1 5 SO DC 10ns 15 mA 4000 Vrms Yes - - 10ns
RS Stock No. 818-8372
Mfr. Part No.HCPL-7860-300E
BrandBroadcom
TWD243
Each
Surface Mount Transistor 0.2V 1 8 DIP DC - 15 mA 20 kV Yes - - -
RS Stock No. 171-8623
Mfr. Part No.AQV251
BrandPanasonic
TWD183
Each
Through Hole MOSFET - - 6 DIP DC - 50 mA 1.5 kVrms - - - -
RS Stock No. 885-1279
Mfr. Part No.TLP250H(D4,F)
BrandToshiba
TWD46
Each (In a Pack of 5)
Through Hole Photo IC 1.8V 1 8 DIP - 50ns 3 mA 2500 Vrms Yes - - 50ns
RS Stock No. 761-3375
Mfr. Part No.HCPL2631
TWD87
Each (In a Pack of 2)
Through Hole Logic Gate 1.75V 2 8 MDIP DC 50ns 30 mA 2500 V ac Yes - - 12ns
RS Stock No. 699-8225
Mfr. Part No.SFH6156-3T
BrandVishay
TWD23
Each (In a Pack of 10)
Surface Mount Transistor 1.65V 1 4 SMD DC 3µs 60 mA 5300 V ac - 200% 100 % 14µs
RS Stock No. 100-0150
Mfr. Part No.TLP127(U,F)
BrandToshiba
TWD30
Each (In a Pack of 25)
Surface Mount Darlington 1.3V 1 4 SOP DC 40µs 50 mA 2500 V ac - 4000% 1000 % 15µs
RS Stock No. 885-1253
Mfr. Part No.TLP352(D4,F)
BrandToshiba
TWD49
Each (In a Pack of 5)
Through Hole Photo IC 1.7V 1 8 DIP - 15ns 3 mA 3750 Vrms Yes - - 8ns
RS Stock No. 547-3841
Mfr. Part No.HCPL-2530-000E
BrandBroadcom
TWD80
Each
Through Hole Logic Gate 1.7V 2 8 PDIP DC - 25 mA 5 kVrms Yes 50% 7 % -