ACPL-K73L-520E

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Optoisolators are electronic devices used to transfer signals between two parts of an electronic system while safely isolating them from one another. This isolation helps protect delicate circuitry and limit electromagnetic interference (EMI) and radio frequency interference (RFI). The ACPL-K73L-520E is an optoisolator specifically designed for logic output applications. This article provides an overview of the functionality and working principle of the ACPL-K73L-520E.

The ACPL-K73L-520E is a bipolar output optoisolator with an input voltage range of 2.7V to 5.5V. It is specifically designed to be used as a logic-level interface between two digital circuits, providing optical isolation between them. The optoisolator consists of a light-emitting diode and a phototransistor, which are electrically isolated from one another by a transparent package. The LED is powered by the input voltage, while the phototransistor is capable of driving a TTL-level load. This design ensures that the two sides of the circuit are electrically isolated, preventing interference from being transferred between them.

The working principle of the ACPL-K73L-520E is simple. When power is applied to the input, the LED is illuminated, and the phototransistor is activated. When the phototransistor is activated, it acts as an open switch, allowing power to flow through the output. The strength of the output depends on the intensity of the LED’s light, which can be varied by changing the input voltage. The optoisolator is designed to stay off, or “latched off”, when the LED is not illuminated. This ensures that the output remains off when the input voltage is removed and prevents accidental activation of the output.

The ACPL-K73L-520E is mainly used in logic-level signaling applications. It can be used to transfer digital signals between a microcontroller or other digital logic circuit, and a circuit with a higher voltage level. This optoisolator can also be used to protect sensitive circuitry from the effects of surges or spikes in voltage. The optoisolator’s optical isolation ensures that only the desired signal is transferred, preventing EMI or RFI from affecting the protected circuit.

The ACPL-K73L-520E proves to be a versatile and reliable optoisolator in logic-level applications. It can provide isolation between two circuits while allowing signals to be transmitted in either direction. The low voltage requirements and low power consumption make it an ideal choice for low power systems, and its latching feature ensures that no false signals can be sent when power is removed. With its wide range of features and benefits, the ACPL-K73L-520E is sure to be a valuable addition to any system design.

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