HCPL0639

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Optoisolators are components used to provide electrical isolation between two circuits or signals while allowing one signal to control another. This group of components, sometimes called optocouplers, supports a variety of different signal types and applications. One such product is the HCPL-0639 from Avago Technologies. This component is designed to provide isolation and signal conversion between a logic input signal and a logic output signal.

HCPL-0639 Application Field

The HCPL-0639 is a logic output optoisolator that incorporates an ultra-low input current LED combined with an integrated Schmitt trigger detector. It is designed to provide up to 3-kVrms of isolation between two circuits and is capable of operation in both digital and analog logic applications. This product is suitable for use in digital or analog applications such as motor control systems, electronic locking systems, data communication systems, and switching power supplies.

The HCPL-0639 is designed to operate in a wide temperature range from -40°C to +85°C and is pin-compatible with National\'s LM124 and Motorola\'s MC1407. It has an optically coupled dark incandescence device that is rated for speeds up to 4-MHz and a logic output that is compatible with most popular logic families such as TTL, CMOS, LSTTL, HCMOS, and HCT. The device is also able to operate from single +5V to dual ±5V supplies, placing it in the flexible power category.

HCPL-0639 Working Principle

The HCPL-0639 is designed to isolate two circuits electrically, while allowing one signal to control another. This is done by using an optical output LED which is optically coupled to an integrated Schmitt trigger detector­. The LED is driven by the input signal, which produces a light output proportional to the input voltage. The light output is optically coupled to the integrated Schmitt trigger detector, which then converts the light signal into a logic output.

The Schmitt trigger detector is a type of digital circuit which consists of two voltage comparators connected in series. When the input voltage signal crosses one of the voltage thresholds, the comparison result is inverted. The result is a well-defined output pulse, which is then used to create the logic output. This makes the HCPL-0639 a very fast and reliable device for performing digital logic isolation in a wide range of industrial and consumer applications.

Conclusion

The HCPL-0639 from Avago Technologies is a logic output optoisolator that is optimized for digital and analog logic applications requiring electrical isolation and signal conversion. It is capable of operating in temperatures from -40°C to +85°C and from single +5V to dual ±5V power supplies. The HCPL-0639 has an optically coupled dark incandescence device that is rated for speeds up to 4-MHz and a logic output that is compatible with most popular logic families. This makes it an ideal choice for customers who require reliable and fast logic isolation in harsh environments.

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