FOD4118SD Isolators

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Opto-isolators, also known as optical couplers, allow a range of signals and information to be transferred between two adjacent circuits, while maintaining electrical isolation between the two circuits. The FOD4118SD is a Triac and SCR Output optical isolator device produced by Fairchild Optocoupler. This device is designed for applications requiring an optically isolated triac or SCR output switch. Studies have shown that the use of opto-isolator devices can be particularly beneficial in applications requiring high isolation voltages. This is because of the electrical insulation provided by the isolation film.

FOD4118S is an opto-isolator that consists of an Infrared LED, an optical detector, a Triac SCR output, and a snubber network. The device works by generating an optical link between two separate and isolated circuits. The LED acts as a light source and transmits an electrical signal to the optical detector, which then converts this signal into an isolated version, allowing for true electrical isolation. The isolated version of the signal is then fed to the Triac SCR output, resulting in a load connected to the SCR output being activated or tripping off.

When constructing the FOD4118SD, a three-pin SCR output terminal is typically used. The first terminal is connected to the output of the optical detector, while the second terminal is connected to the LED and the third terminal is connected to the snubber network. The snubber network is used to protect the device from high frequency interference and high voltage transient pulses. Additionally, the snubber network may also be used to increase the response time of the FOD4118SD, as it acts as a capacitor, allowing electrical energy to be stored until the isolator is triggered.

The main advantages of the FOD4118SD are its ability to provide electrical isolation between two circuits, as well as its ability to act as an SCR or Triac output electrical switch. Additionally, the device has a wide operating temperature range, making it suitable for use in a range of conditions. Additionally, the device’s response time is extremely fast, with typical switching times of 0.3ms.

Due to its impressive range of features, the FOD4118SD is an ideal device for applications requiring high electrical isolation between two circuits, as well as for applications which require a fast switch response time. Furthermore, the device is well-suited to applications requiring the switching of AC and DC loads, as the device is able to offer both AC and DC outputs.

In summary, the FOD4118SD is a Triac and SCR Output optical isolator device that offers excellent electrical isolation between two circuits and an extremely fast response time. Additionally, the device is capable of switching both AC and DC loads, making it a versatile device for applications requiring isolation and switching.

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