SL55013S

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Optoisolators, also sometimes referred to as optical couplers, are devices which can transfer electrical signals across an optical barrier. This allows for a degree of isolation between input and output circuits. The SL55013S is an example of such an optoisolator, part of the Transistor, Photovoltaic Output group. In this article we will explore the application field and working principle of this device.

The SL55013S is most commonly used in the field of digital communication. It is used to pass digital (high/low) signals though a light barrier, enabling isolation and prevention of ground loops. The input side is connected to a digital output (such as a logic output from a microcontroller), while the output side is connected to a digital input (such as a logic input to another device). This device can be used to ensure a reliable signal transmission, regardless of their connection environment or power supply noise.

This optoisolator is based on a photovoltaic cell, which uses a transistor as the switch. When voltage is applied to the input, the photovoltaic cell will be turned on and the transistor will pull the output to ground, thus producing a digital logical “1”. If no voltage is supplied to the input, the photovoltaic cell will be turned off and output will not be pulled low, thus producing a digital logical “0”.

The SL55013S is also able to pass very small currents, such as those generated by digital signals. It can also pass signal pulses of up to 20 kHz. This makes it ideal for low-speed communication applications, such as those used in alarm systems. Additionally, this optoisolator is able to pass a signal at a frequency range as wide as 2.4 kHz - 21 kHz, making it suitable for use in audio applications as well.

The SL55013S also offers a high degree of noise immunity, which is key when communicating in environments with high levels of electromagnetic interference. The device also features a low dropout voltage, which is important when supplying digital systems with direct current. Finally, the SL55013S is also rated to operate in temperatures between -55 and +125°C, making it suitable for use in a wide range of applications.

In summary, the SL55013S is a photovoltaic optoisolator which is particularly suited to digital communication applications, due to its low dropout voltage, wide operating temperature range, noise immunity and ability to transfer very small currents. It is also able to pass signal pulses across a range of 2.4 kHz - 21 kHz, enabling it to be used in audio applications.

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