EL817(S)(D)(TA)-G

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Optoisolators, also known as optocouplers, are an important component of many industrial and consumer electronic devices. EL817(S)(D)(TA)-G optoisolators are a type of optoisolator that use a photo-transistor within the optoisolator to provide electrical isolation between two circuits. Despite their relatively small size, they offer both input-to-output isolation and output-to-input blocking. This article will provide an overview of the EL817(S)(D)(TA)-G optoisolator, including its application fields, working principle, and key features.

Application Fields

EL817(S)(D)(TA)-G optoisolators are widely used in a range of applications where high isolation voltages are required, including DC/DC converters, inverters, power supplies, motor controllers, industrial controllers, and more. They are also suitable for applications with high peak voltages, such as AC motor drives. Additionally, they are widely used in consumer electronics, such as laptops, mobile phones, and other devices to provide isolation between the circuits.

Working Principle

At the heart of the optoisolator is a photo-transistor that is used to transmit signals across the two electrical circuits. The photo-transistor works by converting light energy from an LED into an electrical signal in the form of an output current. When the LED is illuminated, the collector current of the transistor is released and the transistor is turned on. This output current is used to activate the output circuit of the optoisolator. The output circuit can be either an open collector or a totem-pole output.

The optoisolator is also designed to protect the input signal from any excessive electric field or voltage that may be present in the output circuit. This is achieved by means of an "optical coupler" which isolates the input signal from the output circuit.

Key Features

The EL817(S)(D)(TA)-G optoisolator offers a number of key features that make it a popular optoisolator for many applications. It has a high input-to-output isolation voltage, ranging from 500V to 2000V, depending on the model. It also has a high peak blocking voltage of up to 5000V. Additionally, it has a current transfer ratio (CTR) that varies from 100% to 500%, depending on the LED current. Finally, the optoisolator is RoHS compliant and is available in a variety of packages, including TO-220, DIP, 8-SMD, and SOP.

In summary, the EL817(S)(D)(TA)-G optoisolator is a device that uses a photo-transistor to provide electrical isolation between two circuits. It is used in a wide range of applications where high isolation voltages and peak voltages are required. The optoisolator is also designed to protect the input signal from any excessive electric field or voltage that may be present in the output circuit. Additionally, it offers a number of key features, including a high input-to-output isolation voltage, a high peak blocking voltage, a variable current transfer ratio, and RoHS compliance.

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