HCPL-0721-500E Isolators

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HCPL-0721-500E is one type of optoisolator logic output, which includes a suppressor diode and a light-emitting diode (LED) in a 4-pin package. For many application fields, the HCPL-0721-500E can be used as a signal interface isolation between the input circuit and output circuits, for achieving electrical isolation between two circuits, which can protect the control circuit of data and reduce the noise interference. In addition, HCPL-0721-500E is also a component to prevent surges and protect systems in process of data transmission.

The HCPL-0721-500E optoisolator logic output can be used on communication systems, such as VF signal control, equipments for testing and measuring, as well as multimedia control. The supplement diode built-in the optoisolator can suppress the EMIF and reduce the reverse current flowing from output side to input side. In addition, the HCPL-0721-500E can also be used in SPDT-relay drive, and implemented in a variety of systems interface isolation and transmission of digital signals.

The working principle of the HCPL-0721-500E optoisolator logic output is based on the coupling of light signal from the LED on the input side to the photo-detector on the output side. In normal action, the LED is driven by the input signal from the input terminal (IN). The LED emits optical radiation in the photo-detector, which is on the output side of the optoisolator. The radiation intensity is then transformed to the electrical signal for output. The output port (OUT) provides a logic signal that can be used to drive an external load.

Besides, in order to protect the core component, HCPL-0721-500E’s input and output are separated when the module is in an isolated state. The LED has a built-in dark-current multiple protection circuit, which can reduce the noise interference. This optoisolator logic output has an excellent common-mode transient immunity (CMTI). It guarantees the input terminal and the output terminal isolated for a long term period, and also guarantees the normal operation for the control circuit.

In conclusion, optoisolator HCPL-0721-500E logic output is very versatile component, which enables electrical isolation between two circuits, as well as signal transmission. The operating principle of HCPL-0721-500E is based on the radiation from the LED to the photo-detector, which is then transferred to a logic signal. Moreover, the optoisolator also has excellent CMTI, with built-in multiple protection circuits, for achieving longer maintenance period and insulation, and to protect the control circuit.

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