EL357NB(TB)-G

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Opto isolators are components used in electronics circuits to isolate signals between two electrical devices from each other. The main idea behind such an isolator is to prevent electrical signals from one device to interfere with the signals from another device. The EL357NB(TB)-G optoisolator is an opto isolator with a transistor, photovoltaic output. In this article, the application fields and working principle of EL357NB(TB)-G will be discussed.

The EL357NB(TB)-G optoisolator is typically used in AC motor control, pulse width modulation (PWM) control, microcomputer communication isolation, and AC switching control systems. This type of optoisolator can provide excellent reliability, high speed, linearity, and accuracy. The EL357NB(TB)-G optoisolator is particularly suitable for use in harsh environment or high-amplitude input current applications due to its high EMI resistance and common mode transient immunity.

The EL357NB(TB)-G optoisolator consists of a LED, a phototransistor, and a Darlington transistor output stage. The LED has a nominal forward voltage of 1.2V. The LED is driven by an external input current, typically a 5V logic signal. The LED emits light when the input signal is on, which triggers the phototransistor to turn on or off. In this way, the LED is used to control the state of the output transistor. When the phototransistor is turned on, the output transistor is also turned on, allowing the output current to flow to the load.

The EL357NB(TB)-G optoisolator also has a number of important features. For starters, it is protected against output short circuit, which means it will automatically turn itself off when the output current is excessive. It also has a fast response time – typically 5μs to 10μs – which makes it ideal for high-speed applications. It also has a high current overload capacity (250mA) which makes it suitable for use in applications that require a high current load. Finally, it is designed to be highly resistant to EMI, allowing it to be used in environments with high levels of electromagnetic interference.

In conclusion, the EL357NB(TB)-G optoisolator is a highly reliable and accurate opto isolator with a transistor, photovoltaic output. It is suitable for use in a wide range of AC motor control, PWM control, microcomputer communication isolation, and AC switching control systems. It is protected against output short circuit, has a fast response time, and a high current overload capacity, and is highly resistant to EMI. All of these features make the EL357NB(TB)-G optoisolator an ideal choice for applications that require a reliable and accurate isolator.

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