HCPL-0708

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Optoisolators are used to accurately isolate one electrical circuit from another. The logic output optoisolator,specifically the HCPL-0708, is often used in these circuit applications. In control systems, optoisolators can be used to isolate an input from an output when controlling a system. The optoisolator is capable of isolating wide input voltage and/or current levels, and providing a low-current drive to logic levels.

HCPL-0708 Application Field

The HCPL-0708 optoisolator is a 8-pin device that works with a low input current of 1mA at an input voltage rating of 3.75V to 65V. It serves as an optocoupler, which is used to optically isolate and transfer the control signals between two circuits. This small, easily configured optoisolator enables safeguarding of the system against surges and transients for both AC and DC load driving. It is suitable for multiple applications including:

• Hard disk SMART detection
• Server system control
• Suppress voltage/transient surges
• Safety equipment/circuit protection
• Measure ground fault interrupter (GFCI)
• Power converters and adpaters
• Industrial and safety control applications
• Network systems

HCPL-0708 Working Principle

The HCPL-0708 optoisolator is comprised of two sections: an optically isolated LED emitter, a detector IC, and a power output transistor. The LED emitter receives signals from one circuit using an electrical input. Light from the LED is then transmitted through an optical filter to the detector. This light is converted to electrical current, which is filtered and amplified. Finally, it is output using an open collector transistor.

The LED and detector are insulated from each other providing the voltage and current isolation of input and output. The LED is driven with current, usually 1mA at 3.75V to 65V. There is no minimum power on the output circuit, allowing the detective ICs output to remain off until it is required. This will save power, increase system efficiency, and improve safety for the user.

The HCPL-0708 optoisolator provides reliability, high surge capability, and low distortion for today’s complex system, these features help to ensure fewer EMI/RFI emissions. The operating temperature range of the device is -40 to +105°C, allowing for a wide range of applications.

Conclusion

The HCPL-0708 logic output optoisolator is suitable for many applications, thanks to its wide voltage and current range, temperature range, and high surge capability. This miniature device is easy to install and configure, and provides high levels of reliability for any circuit it is used in.

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