CNW11AV1

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Optoisolators, also known as optical isolators, are optoelectronic components that create a galvanic separation between two circuits. This type of isolation increases noise immunity, thereby ensuring reliable operation. Optoisolators are constructed using a variety of components with MOSFETS or optical components, such as LEDs and photodiodes, being the most common. The CNW11AV1 optoisolators are classified as transistor, photovoltaic output devices.

The CNW11AV1 optoisolator is a three-terminal device featuring a photovoltaic output stage, and are housed in a 4-pin DIP plastic package. This optoisolated device comprises a gallium arsenide infrared LED within a conductive plastic housing, optically coupled to an integrated photodiode with an output transistor. Examples of the CNW11AV1 have an LED input current of 5 mA (maximum) and a CTR rating of 1000:1, with an output photodiode voltage of 30 V (maximum) and a max forward voltage drop of 1.2 V. Operating temperature range is from 0˚C to 70˚C.

The CNW11AV1 optoisolator has direct connections for the LED, photodiode and collector-emitter of the output transistor. There is mass insulation between the LED and output transistor, allowing for galvanic isolation of the two circuits. The LED input is driven by an input supply voltage, while the photodiode utilises the output current of the output transistor.

When high electrical voltage is fed to the LED input of the CNW11AV1 optoisolator, light from the LED illuminates the photodiode, which in turn energises the output transistor. The output transistor then switches from its off-state to its on-state, causing the output transistor collector current, to start flowing. This provides a secure transfer of a signal, with voltage and current capability, between two isolated circuits.

Due to this type of optoisolator’s capability of providing a high breakdown voltage of 5000Vrms in an economical package, the CNW11AV1 is widely used in equipment to support telecom signals, including radio transceivers, off-hook signal, call progress and other industry applications. For example, the CNW11AV1 can be used in XDSL systems, mobile phones, consumer video equipment, home network systems as well as in medical instruments and night visibility systems.

For low voltage circuits, the CNW11AV1 optoisolator vastly helps reduce noise, in turn allowing for reliable circuit operation. It can be used to connect two circuits of different power levels and for interfacing with high voltage circuits. Further, the increased galvanic separation of the input and output circuits allows the isolation of actuators and sensors from other circuits, reducing the occurrence of possible side effects due to electromagnetic interference from other components.

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