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
Optocoupler ICs
3949
Filters
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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RS Stock No.
145-5525
Mfr. Part No.4N35M
BrandON Semiconductor
|
HK$1.59
Each (In a Bag of 1000)
units
|
Through Hole | Transistor | 1.5V | 1 | 6 | PDIP | DC | - | 60 mA | 7.5 kVrms | - | - | 100 % | - |
|
RS Stock No.
699-8284
Mfr. Part No.TCLT1000
BrandVishay
|
HK$2.459
Each (In a Pack of 10)
units
|
Surface Mount | Phototransistor | 1.6V | 1 | 4 | SOP | DC | 3µs | 60 mA | 5000 V ac | - | 600% | 50 % | 4.7µs |
|
|
RS Stock No.
165-2318
Mfr. Part No.TCLT1000
BrandVishay
|
HK$1.82
Each (On a Reel of 3000)
units
|
Surface Mount | Phototransistor | 1.6V | 1 | 4 | SOP | DC | 3µs | 60 mA | 5 kVrms | - | 600% | 50 % | 4.7µs |
|
RS Stock No.
168-9674
Mfr. Part No.LTV-827S-TA1
BrandLite-On
|
HK$1.542
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.
395-6293
Mfr. Part No.KPC357NT0B
BrandCosmo
|
HK$3.438
Each (In a Pack of 10)
units
|
Surface Mount | Transistor | 1.4V | - | 4 | DIP | - | 5µs | 50 mA | 3.75 kVrms | - | 260% | 130 % | 4µs |
|
RS Stock No.
597-302
Mfr. Part No.4N35
BrandIsocom
|
HK$10.60
Each
units
|
Through Hole | Transistor | 1.5V | 1 | 6 | PDIP | DC | 2µs | 60 mA | 5.3 kVrms | - | - | 40 % | 2µs |
|
RS Stock No.
125-7579
Mfr. Part No.LTV-827S
BrandLite-On
|
HK$2.333
Each (In a Tube of 50)
units
|
Surface Mount | - | 1.4V | 2 | 8 | PDIP | DC | - | 50 mA | 5000 Vrms | - | - | - | - |
|
RS Stock No.
169-8557
Mfr. Part No.FOD817A300
BrandON Semiconductor
|
HK$1.019
Each (In a Bag of 2000)
units
|
Through Hole | Transistor | 70V | 1 | 4 | DIP-B | DC | 18µs | 50 mA | 5 kVrms | - | 160% | - | 18µs |
|
RS Stock No.
352-5495
Mfr. Part No.AQY414EH
BrandPanasonic
|
HK$37.62
Each
units
|
Through Hole | MOSFET | - | - | 4 | DIP | DC | - | 50 mA | 5 kVrms | - | - | - | - |
|
|
RS Stock No.
691-2209
Mfr. Part No.LTV-827S-TA1
BrandLite-On
|
HK$2.99
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.
739-0265
Mfr. Part No.FOD817A300
BrandON Semiconductor
|
HK$3.122
Each (In a Pack of 5)
units
|
Through Hole | Transistor | 70V | 1 | 4 | DIP-B | DC | 18µs | 50 mA | 5000 Vrms | - | 160% | - | 18µs |
|
RS Stock No.
169-8133
Mfr. Part No.KPC357NT0B
BrandCosmo
|
HK$2.00
Each (On a Reel of 3000)
units
|
Surface Mount | Transistor | 1.4V | - | 4 | DIP | - | 5µs | 50 mA | 3.75 kVrms | - | 260% | 130 % | 4µs |
|
RS Stock No.
395-6344
Mfr. Part No.K1010 B
BrandCosmo
|
HK$2.835
Each (In a Pack of 10)
units
|
Through Hole | Transistor | 1.4V | - | 4 | DIP | - | 5µs | 50 mA | 5 kVrms | - | 260% | 60 % | 4µs |
|
|
RS Stock No.
173-2229
Mfr. Part No.K1010 B
BrandCosmo
|
HK$1.404
Each (On a Reel of 2000)
units
|
Through Hole | Transistor | 1.4V | - | 4 | DIP | - | 5µs | 50 mA | 5 kVrms | - | 260% | 60 % | 4µs |
|
RS Stock No.
818-8265
Mfr. Part No.ACPL-339J-000E
BrandBroadcom
|
HK$41.15
Each
units
|
Surface Mount | IGBT Gate Drive, MOSFET | 1.95V | 1 | 16 | SO | DC | 80ns | 10 mA | 5000 Vrms | Yes | - | - | 45ns |
|
RS Stock No.
168-8528
Mfr. Part No.4N25
BrandIsocom
|
HK$2.253
Each (In a Tube of 65)
units
|
Through Hole | Transistor | 1.5V | 1 | 6 | PDIP | DC | 2µs | 60 mA | 5.3 kVrms | - | - | 20 % | 2µs |
|
|
RS Stock No.
159-6455
Mfr. Part No.SFH6156-2T
BrandVishay
|
HK$1.767
Each (On a Reel of 1000)
units
|
Surface Mount | Transistor | 1.25V | 1 | 4 | SMD | DC | 3µs | 60 mA | 5.3 kVrms | - | 125% | 63 % | 14µs |
|
RS Stock No.
708-5471
Mfr. Part No.SFH615A-3
BrandVishay
|
HK$2.691
Each (In a Pack of 10)
units
|
Through Hole | Phototransistor | 1.65V | 1 | 4 | PDIP | DC | 3µs | 60 mA | 5300 V ac | - | 200% | 100 % | 14µs |
|
RS Stock No.
178-3125
Mfr. Part No.HCNW4506-000E
BrandBroadcom
|
HK$18.869
Each (In a Tube of 42)
units
|
Through Hole | Inverter, Open-Collector | 1.85V | 1 | 8 | PDIP-W | DC | - | 25 mA | 3.75 kVrms | Yes | 90% | 44 % | - |
|
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RS Stock No.
597-289
Mfr. Part No.4N25
BrandIsocom
|
HK$4.39
Each
units
|
Through Hole | Transistor | 1.5V | 1 | 6 | PDIP | DC | 2µs | 60 mA | 5.3 kVrms | - | - | 20 % | 2µs |
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