EL817(M)(C)

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Optoisolators - Transistor, Photovoltaic Output

The EL817(M)(C) is an optoisolator which consists of an LED coupled with an NPN transistor. It belongs to a category of optoisolators known as Transistor, Photovoltaic Output, which is used to provide electrical isolation between two circuits. They are typically used in pairs, with the LED in one circuit and the NPN transistor in the other. The EL817 has an isolation voltage of 1000Vrms (1,400V peak), which allows it to be used to isolate DC, AC or pulsed signals over a wide range of frequencies.

Applications

Optoisolators are used in many applications, but the EL817 is primarily used in the following areas:

• Overvoltage protection
• High speed switching applications
• High load drive capability
• Low on-state resistance
• Reliable contact detachment
• Isolation of control signals
• Isolation of protection circuits

Working Principle

The working principle of the EL817 optoisolator is relatively simple. The LED transmit a modulated or pulsed light signal. This signal is then received by the photosensitive NPN transistor which then triggers the output circuit. The output circuit is isolated from the input circuit, making it impossible for the input current to affect the output circuit.

Optoisolators also offer a degree of safety, as they prevent electricity from flowing between circuits through physical means, rather than relying on circuitry which can fail. This makes them highly desirable for safety-related applications, such as those where human life is at risk.

The EL817 is a reliable optoisolator that has been designed to work in harsh environments, making it ideal for industrial applications.

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