HCPL-817-56CE Isolators

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The HCPL-817-56CE is an optoisolator belonging to the transistor, photovoltaic output category. It is primarily used in circuit protection and signal isolation applications where high common mode transient immunity, low off state current, wide switching power capability, and very high isolation voltage are desired. In addition, it offers low leakage current, low capacitance, low propagation delay, low input current, and high insulation resistance.

The HCPL-817-56CE optoisolator is designed to provide circuit protection, isolation, and signal control functions. It is used in applications such as motor control, power supplies, contactors, power relays, sensors, and logic circuits. It has low voltage drop, high insulation resistance, wide voltage and current rating, and is designed for both embedded controller and discrete component applications.

The working principle of the HCPL-817-56CE optoisolator involves light emitting diode (LED) and a photovoltaic (PV) detector together in a single package. An infrared LED is driven by a voltage source, which in turn causes a voltage drop across the PV detector. This voltage drop is sensed by the detector due to photocurrent that is generated when the light from the LED hits the PV detector. The output voltage is affected by the intensity and wavelength of the infrared light. Since the LED and the PV detector are not connected electrically, the circuit is isolated from any electrical noise by the insulating barrier. The detector output is then protected from overvoltage by the use of a transient voltage suppressor that is integrated into the package.

The HCPL-817-56CE is also designed with a floating output that can be used to provide isolation and noise immunity. The floating output allows the unit to be used for applications in which galvanic isolation is needed. This feature also provides immunity to ESD that can occur in noisy environments. The HCPL-817-56CE also provides an EMC (electromagnetic compatibility) function that enables it to reject EMC-caused voltage transients which can affect the performance of the system.

The HCPL-817-56CE optoisolator is a compact and reliable device used in a wide range of applications requiring signal isolation, circuit protection, and power switching. It is designed to operate over a wide range of temperature, humidity, and vibration conditions, making it suitable for industrial applications. The device also provides low propagation delay, so it can be used in fast-responding applications. In addition, the device is corrosion resistant and can be operated in high electric fields. It is also highly reliable, with a rated life of more than one billion switching cycles.

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