74OL6011S

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Optoisolators are optically-isolated components that are used to transfer information transversely or at length. Optoisolators employing logic outputs or “opto-couplers” use an internal LED to transceive electrical pulse signals across air gaps with high optical isolation between the input and output sides. With this in mind, this paper will discuss the 74OL6011S optoisolator, focusing on its application field and working principle.

The 74OL6117S optoisolator provides 3.75kV back-to-back isolation between the input, output, and power lines to prevent potential contamination or disruption from external signals. This dual-channel optoisolator is capable of handling logic signals with TTL and CMOS compatible outputs, and operates over a wide voltage range between 3.15 and 5.5 V. The open-collector driver output is capable of sinking at 100mA which is advantageous for various logic level designs. Its coupling capacitance of 0.5 pF maximum minimizes signal propagation delays and can lower overall system power consumption. Additionally, this device has the ability to regulate a wide range of input LED forward-currents, eliminating the need for external base-resistors for an efficient circuit.

The 74OL6011S optoisolator functions in accordance with Faraday’s law of induction, and the basic operation can be broken down into three stages. The main component of the 74OL6011S consists of an LED light transmitter and a photosensitive transistor which are separated by a high-isolation barrier. Upon the application of an input voltage, electrons flow from the current-limiting resistor into the engraved LED light transmitter, building up an electric field. This electric field induces a magnetic flux field in turn which activates the photosensitive transistor through the optical beam. The output of this optoisolator is the collector current which is proportional to the magnitude of the input current up to the maximum specified collector current limit.

The 74OL6011S optoisolator is commonly employed in various computing, automotive, and industrial systems. Specific applications include: air conditioning / climate control systems, memory modules, logic signal interfaces, cable modems, electronic banking systems, elevator systems, and AC motor control circuits. A few application notes include an inverter logic security interface, motor inverter drive circuit, and open-collector driver circuit. With the ability to handle wide input voltages and wide temperature ranges, the 74OL6011S can be universally applied without difficulty.

In conclusion, the 74OL6011S device provides a high level of isolation and eliminates the need for external base resistors. The isolation of logic signals allows for independent operation and safe communication across various systems, and the flexibility to fit numerous applications. With a low capacitance propagation delay, this optoisolator is advantageous for low-voltage and low-power designs, and is suitable for many logic-level applications.

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