ELW137

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An opto-isolator, also commonly called an optocoupler or optical isolator, is an electronic device designed to provide electrical isolation between two parts of a circuit while allowing them to communicate. An opto-isolator typically includes an LED light source, which emits a beam of light that is directed at a photodetector, such as a photodiode, a photoresistor, or a photoconductor. When a logic signal is applied to the LED’s input, the light emitted by the LED activates the photodetector and causes its output signal to be activated or deactivated. In this way, the opto-isolator is able to transmit a logic signal from one device to another without allowing any other signals to pass between them. The ELW137 is an opto-isolator designed for logic output applications.

The ELW137 is a single-channel logic output opto-isolator, which means that it is used to transmit a single logic signal between two circuits. It has a 6-pin DIP package and is powered by 5V DC. The ELW137 has an input drive circuitry, consisting of a TTL output from a microcontroller, and an optically-coupled output. The output drive circuitry is comprised of a photovoltaic cell and a Darlington output transistor. The ELW137 is designed to be used in environments with ambient temperatures of up to 70°C, and can withstand a maximum transient voltage of 8V.

The working principle of the ELW137 is straightforward. When a logic signal is applied to the input, the LED is activated and emits a beam of light, which is detected by the photovoltaic cell on the output side. The photovoltaic cell then generates a current, which activates the Darlington transistor and causes its output signal to be activated or deactivated, depending on the input signal. As the signal is optically coupled, it is completely isolated from the input, preventing any interference or crosstalk between the two circuits.

The ELW137 is mainly used for logic output applications, such as industrial automation systems and surveillance systems. It is also used in medical equipment and security systems, where space and cost savings are important considerations. The ELW137 is especially well suited for use in high-voltage and high-temperature applications, as it is capable of isolating up to 8V AC and is designed to be used in temperatures of up to 70°C. This makes it ideal for applications such as motor or solenoid control, as well as in automotive, aviation, and telecommunications.

In summary, the ELW137 is a logic output opto-isolator designed to transmit logic signals between two circuits while providing electrical isolation between them. It is mainly used in logic output applications, such as industrial automation systems and surveillance systems, and is particularly well suited for use in high-voltage and high-temperature applications. The ELW137 is powered by 5V DC and can withstand a maximum of 8V AC, making it an ideal choice for a wide range of applications.

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