FOD852SD

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Optoisolators are devices that use a combination of electro-opaque material and light-sensitive elements to isolate electric current carrying inputs from outputs. In applications where an input needs to be insulated from the output, an optoisolator can provide necessary protection against voltage or current surges, or other potential disruptions that might otherwise cause damage. One of the most popular and widely used optoisolators is the FOD852SD, a photovoltaic output optoisolator.

The FOD852SD is a three pin optoisolator consisting of a gallium arsenide infrared (GaAs IR) light-emitting diode (LED) couple to a silicon phototransistor output. This device is a low-cost optoisolator and can tolerate input-to-output isolation ratings up to 6kVrms. The device couple a gallium arsenide LED with a silicon phototransistor of optimized characteristics for minimum current transfer ratio variation over a wide temperature range and is designed for use in TTL logic-style circuits. The FOD852SD has a minimum trigger current that is more than 1mA, and the isolation voltage is 6kVrms.

The working principle of the FOD852SD is one where it uses the principle of optical isolation to separate input and output signals. It does this by directing a focused beam of light from the LED towards the silicon photodetector. When the LED is turned on, it illuminates the phototransistor, allowing current to flow between the LED and the phototransistor. The light passes through the electro-optically transparent substrate, insulating the input and output from each other.

The FOD852SD is a widely used optoisolator in applications such as UPS (uninterruptible power supplies), motor control systems, medical imaging systems, and control systems for electronic appliances. It offers robust performance in these systems and is specially designed for use with small signal circuits, where electrical isolation is needed to reduce the risk of electrical interference between input and output, and to ensure reliable operation. Additionally, it offers high noise immunity for applications where there are large changes in environmental conditions.

The FOD852SD optoisolator has a wide array of benefits and is a popular choice for many engineers. It has a wide range of applications, low trigger current, and 6kVrms isolation voltage. This makes it ideal for applications where small signals need to travel through an isolated path in order to reduce the risk of electrical interference. It also offers excellent noise immunity and is capable of providing reliable operation, even in environments with large changes in environmental conditions.

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