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. 811-6178
Mfr. Part No.4N28
BrandVishay
$0.648
Each (In a Pack of 10)
units
Through Hole Phototransistor 1.5V 1 6 DIP DC 2µs 60 mA 5000 Vrms - 30% - 2µs
RS Stock No. 739-0252
Mfr. Part No.MOC3041M
$1.254
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. 168-7814
Mfr. Part No.TLP188(E
BrandToshiba
$0.851
Each (In a Tube of 125)
units
Surface Mount Transistor 1.4V 1 4 SOIC AC 2µs 50 mA 3.75 kVrms - 600% - 3µs
RS Stock No. 453-0707
Mfr. Part No.ISD74X
BrandIsocom
$1.76
Each (In a Pack of 5)
units
Through Hole Phototransistor 1.65V 2 8 PDIP DC 2.6µs 50 mA 5.3 kVrms - - 12.5 % 2.2µs
RS Stock No. 547-3712
Mfr. Part No.HCPL-4503-000E
BrandBroadcom
$3.52
Each
units
Through Hole Transistor 1.7V 1 8 PDIP DC - 25 mA 3.75 kVrms Yes 50% 19 % -
RS Stock No. 739-4983
Mfr. Part No.FODM8061
$2.55
Each
units
Surface Mount Logic Gate 1.8V - 5 SO DC 20ns 50 mA 3750 V ac Yes - - 10ns
RS Stock No. 708-5437
Mfr. Part No.K847PH
BrandVishay
$2.002
Each (In a Pack of 10)
units
Through Hole Transistor 1.6V 4 16 DIP DC 3µs 60 mA 5000 V ac - 600% 50 % 4.7µs
RS Stock No. 547-3706
Mfr. Part No.6N138-000E
BrandBroadcom
$2.30
Each
units
Through Hole Darlington 1.7V 1 8 PDIP DC - 20 mA 3.75 kVrms Yes 2600% 300 % -
RS Stock No. 168-9673
Mfr. Part No.LTV-827
BrandLite-On
$0.575
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. 547-3740
Mfr. Part No.HCPL-2601-000E
BrandBroadcom
$3.66
Each
units
Through Hole Transistor 1.75V 1 8 DIP DC 24ns 20 mA 3.75 kVrms Yes - - 10ns
RS Stock No. 691-2205
Mfr. Part No.LTV-827
BrandLite-On
$0.712
Each (In a Pack of 5)
units
Through Hole Transistor 1.4V 2 8 PDIP DC 4µs 50 mA 5 kVrms - 600% 50 % 3µs
RS Stock No. 807-6594
Mfr. Part No.H11G1M
$1.177
Each (In a Pack of 10)
units
Through Hole Photodarlington 1.5V 1 6 MDIP DC 5µs 60 mA 7500 V ac - 1000% - 100µs
RS Stock No. 166-3243
Mfr. Part No.FODM8061R2
$1.503
Each (On a Reel of 2500)
units
Surface Mount Schottky-Clamped Transistor 1.8V 1 5 Mini-Flat DC 20ns 50 mA 3.75 kVrms Yes - - 10ns
RS Stock No. 395-6338
Mfr. Part No.KM0C3022
BrandCosmo
$1.863
Each (In a Pack of 10)
units
Through Hole Phototriac 1.5V - 6 DIP - - 50 mA 5 kVrms - - - -
RS Stock No. 168-7830
Mfr. Part No.TLP293(E
BrandToshiba
$0.345
Each (On a Tape of 175)
units
Surface Mount Transistor 1.4V 1 4 SOIC DC 2µs 50 mA 3.75 kVrms - 600% - 3µs
RS Stock No. 885-1077
Mfr. Part No.TLP290(GB,SE(T
BrandToshiba
$0.494
Each (In a Pack of 25)
units
Surface Mount Phototransistor 1.4V 1 4 SO4 AC, DC 4 μ ±50 mA 3750 Vrms - 400% - 7µs
RS Stock No. 145-4326
Mfr. Part No.FODM8061
$1.727
Each (In a Tube of 100)
units
Surface Mount Logic Gate 1.8V - 5 SO DC 20ns 50 mA 3.75 kVrms Yes - - 10ns
RS Stock No. 237-057
Mfr. Part No.HCPL-3140-000E
BrandBroadcom
$3.84
Each (In a Pack of 5)
units
Through Hole Transistor 1.8V - 8 DIP DC 50ns 12 mA 3.75 kVrms Yes - - 50ns
RS Stock No. 168-9683
Mfr. Part No.MOC3021
BrandLite-On
$0.627
Each (In a Tube of 65)
units
Through Hole Triac - 1 6 PDIP - - 50 mA 5 kVrms - - - -
RS Stock No. 885-1061
Mfr. Part No.TLP188(E(T
BrandToshiba
$0.765
Each (In a Pack of 25)
units
Surface Mount Phototransistor 1.4V 1 4 SO6 DC 2µs 50 mA 3750 Vrms - 600% - 3µs