HCPL-263A-520E Isolators

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Optoisolators, also known as optocouplers, are used to provide electrical galvanic isolation between two circuits. They are especially suitable for applications where a device needs to provide electrical isolation between two signals, one at the input of a process and the other at the output. As such, they are widely used in modern electronics, most notably in automotive, industrial and medical systems. One of the most popular optoisolators is the HCPL-263A-520E, belonging to the Logic Output series.

Overview

The HCPL-263A-520E is an optoisolator designed for logic-level applications. It provides digital output stage isolation with an LED input stage, allowing for isolated logical communication of logic-level signals. The device has an isolation voltage rating of 1.5kV AC, making it suitable for many applications that require isolation of the input and output signals in order to prevent against short circuits, induced noise, or ground loop problems.

Features

The HCPL-263A-520E includes a number of features that make it suitable for a range of applications. Its wide input voltage range of 9 to 40V allows it to be integrated into a wide range of electronic systems, while its high common-mode transient immunity (CMTI) rating of >60kV/µs makes it suitable for applications where the input and output signals may be susceptible to noise and other transient signals. Its maximum operating temperature range is -40 to 85°C, so it can be used in a range of ambient temperatures. The device also includes a low power output stage, providing up to 75mA of load current and only using 10mW of power.

Working Principle

The HCPL-263A-520E uses a gallium arsenide (GaAs) LED and a CMOS logic gate to provide high voltage and noise isolation between the input and output signal. The input LED is driven with a logic signal, such as a TTL or CMOS signal, and the LED then illuminates, providing current to the output stage. The output stage uses a CMOS logic gate and a MOSFET transistor to provide the driven output signal. The MOSFET output transistor is turned on or off depending on the current provided by the LED, and the output signal is “isolated” from any potential noise or transients on the input side.

Application Fields

The HCPL-263A-520E is suitable for a range of logic output applications, including interfacing between separate systems, controlling high voltage relays and low voltage switches, providing isolation between signals with different voltage levels, and protecting against ground isolating problems. It is often used in applications such as medical imaging systems, automotive systems, industrial controllers, aircraft control systems, and HVAC systems. The device can also be used to provide AC isolation in data acquisition systems.

Conclusion

The HCPL-263A-520E, categorized as a Logic Output optoisolator, is designed for applications that require high-voltage isolation and noise immunity. It features a wide input voltage range, a high CMTI rating, and low power output stages, making it suitable for a range of applications. It is often used in automotive, industrial, medical, and aviation systems.

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