HCPL-1931#300

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Optoisolators, or optocouplers, are electronic components used to isolate high voltage, radio frequency (RF) and other signals to protect circuit functionality, provide noise reduction and reduce cross-talk. HCPL-1931#300 is one type of optocouplers with logic output, and widely used in industrial automation systems. Here, this article will focus on its application fields and working principle.

Application Field

HCPL-1931#300 is a optomos type optocoupler with IRED at the input, LED at the output, and logic output capability. It offers 4200 Vrms isolation, which make it widely used in industrial automation systems. It is especially suitable for 5V systems as it can be interfaced directly with TTL/CMOS logic blocks. The HCPL-1931#300 provides a true three-state-logic output, which allows it to be directly connected to digital logic systems.

In addition, HCPL-1931#300 is featured with low output-to-input current transfer ratio (CTR = 10% to 65%), low current transfer ratio (CTR) variation (-5% to +15%) over temperature, low propagation delay times, fast rise and fall times, wide operating temperature range of -40°C to +85°C, and wide package options with SMT, DIP and ISOmini. All of these advantages make HCPL-1931#300 one of the most widely used optocoupler in industrial automation systems.

Working Principle

HCPL-1931#300 consists of two parts, the input part and the output part. The input part is a photo diode which converts the input light signals into electrical signals. The output part is a light emitting diode (LED) which converts the input signal to a light signal. The two parts are separated by an optical wave guide or a light barrier and they are optically coupled. This optically coupled signal can be used to drive digital logic systems.

When a low-level signal is applied to the input of HCPL-1931#300, the photo diode on the input side converts the electrical signals into light signals. The light signals are then optically coupled to the output side and are converted back to electrical signals. The output transistor then amplifies and reshapes the electrical signals to drive the digital logic systems. The true three-state-logic output allows the inputs to be directly connected to the digital logic systems, which eliminates the need for additional logic circuits.

Conclusion

Overall, HCPL-1931#300 is a widely used optocoupler with logic output in industrial automation systems. It features with low output-to-input current transfer ratio (CTR = 10% to 65%), low current transfer ratio (CTR) variation (-5% to +15%) over temperature, low propagation delay times, fast rise and fall times, wide operating temperature range of -40°C to +85°C, and wide package options with SMT, DIP and ISOmini.

While on the working principle side, the HCPL-1931#300 functions by converting the input electrical signals into light signals and optically couple them to the output side. The output transistors then amplifies and reshapes the electrical signals to drive digital logic systems. With its true three-state-logic output, it eliminates the need for an additional logic circuit.

In conclusion, HCPL-1931#300 is a reliable and flexible optocoupler with logic output, which makes it ideal to be used in industrial automation systems.

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