HCPL-261N-300E

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Optoisolators are used in a variety of applications to provide electrical isolation between different circuits. The HCPL-261N-300E logic output optoisolator is specifically designed to provide isolation of 5V TTL and CMOS logic circuits. In this article, we will discuss its application fields and working principle.

Application Fields

The HCPL-261N is designed to operate with standard logic levels and work with 5V TTL/CMOS logic circuits, making it ideal for applications such as logic interface, optical isolation for power supplies, switching amplifiers and logic boards. In circuits where interference from inductive \'hot spots\' can cause logic output errors, this optoisolator can be used to isolate the input and output circuits, eliminating the need for complex signal conditioning. It also provides the isolation required for fail-safe operation, and for dynamic changing of the output signal.

The HCPL-261N is ideal for interfacing to microcontrollers, ADCs and DACs, and is compatible with most popular logic families, including I²C, JTAG, Serial COM and SPI. It is also suitable for use in motor control systems, where the optoisolator can be used to isolate the control circuit and provide protection against electromagnetic interference. The low-power consumption of the device makes it ideal for applications which require long-term use at low power.

Working Principle

The HCPL-261N is composed of a light-emitting diode and a phototransistor, coupled with an integrated photovoltaic (PV) cell, all encapsulated in an 8-pin DIP package. The LED and phototransistor are isolated from each other by the optoisolator\'s epoxy resin and sealed with an opaque material which blocks any direct emission of light between them. This isolates the input and output circuits in order to provide electrical isolation.

When the input voltage is applied to the LED, energy is converted into light, which is then detected by the phototransistor located at the other end of the plastic package. The current generated by the photocell is amplified by the phototransistor, which is then converted back into an electrical signal with sufficient strength to drive the load circuitry.

The integrated PV cell acts as an interface between the input and output devices, allowing the optoisolator to convert the input voltage into an electrical signal without requiring any external components. This also eliminates any signal degradation caused by electrical noise and ensures a reliable signal even at high frequencies.

The HCPL-261N is designed for low-power operation with a maximum supply current of 2.5mA, making it energy efficient and suitable for low-cost, high-reliability applications. It is also capable of operating at high voltage and temperature, making it suitable for a wide range of applications.

Conclusion

The HCPL-261N-300E is a logic output optoisolator designed to provide electrical isolation between 5V TTL and CMOS logic circuits. It is suitable for a wide range of applications, such as logic interface, power supply isolation, switching amplifiers and motor control systems. The device has a low power consumption, is capable of operating at high voltage and temperature, and integrates a photovoltaic cell for improved reliability. As such, it is an ideal solution for providing electrical isolation in a range of applications.

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