About Optocouplers / Photocouplers

Optocouplers are a type of isolator that use a low-power optical signal to transmit one signal from one circuit to another independent circuit. Optocouplers are comprised of an infrared LED light source and an integrated photo detector which usually consists of a photodiode and detector circuit. This optical link or coupling provides electrical isolation between the two circuits which makes the trouble shooting and reliability of circuits more straightforward. These devices are often used to provide electrical isolation between digital signals on the same board, but they are also commonly used in medical and industrial instruments, motor control systems, and signal conditioning circuits. Optocouplers have very high input-to-output isolation voltage and low capacitance, which makes them suitable for signal transmission in high speed applications. Additionally, they manage the call back current of the circuit they are connecting, allowing them to protect against overloads.

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Hot CNY17F-3


Transistor Output Optocouplers Phototransistor Out Single CTR 100-200%
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Vishay 5548
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USD 0.2187
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CNY17-3


CNY17-3 OPTOCOUPLER
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Vishay 3414
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USD 0.2259
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4N35-500E


Transistor Output Optocouplers 3550 Vrms 60mA
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Broadcom 2910
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USD 0.7441
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PC357B


PC357N2TJ00F OPTO COUPLER SMD
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Sharp 2425
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USD 0.351
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TLP621GRTP1FT


Transistor Output Optocouplers TR CTR=100-300%
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Toshiba 1940
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USD 0.2966
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MOC3063-SMD


MOC3063-M DIP SMD OPTOCOUPLER
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Lite-On 970
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USD 0.5245
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PS2501L-1-A


Transistor Output Optocouplers Hi-Iso Photo 1-Ch
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CEL 945
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USD 0.2106
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4N25/LT


4N25/LT OPTOCOUPLER ISOLATOR DIP
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Vishay 577
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USD 0.3392
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LTV-4N25


4N25 LITEON OPTOCOUPLER ISOLATOR DIP
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Vishay 441
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USD 0.193
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TIL195


TIL195 OPTO AC INPUT T/HOLE
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Texas Instruments 417
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USD 0.979
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