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.
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Avago Technologies optocouplers for IPM (Intelligent Power Module)
interface exhibit short propagation delay, fast IGBT switching, high common mode transient rejection and wide operating temperature range.Avago Technologies R2Coupler™ isolation products provide the reinforced insulation and reliability needed for ...
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This range of optocouplers with darlington output, from
Avago Technologies, offer a high current transfer ratio with low input current requirements. The optocoupler devices use light emitting diodes (LEDs) optically coupled with integrated high gain photodetectors. They provide excellent input-output ...
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Data line transmission, with high noise immunity between
electronic equipment, is achieved by using these 20mA current loop transmitter and receiver optocouplers for typical distances up to 9km.
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A range of photocouplers from Toshiba incorporating dual
inverse parallel connected LEDs making them suitable for bipolar input currents. These AC input photocouplers have transistor outputs.