HCPL-7721-320E

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Optical isolators, also known as optoisolators, are components that utilize a light source to isolate and transfer signals between two electronic circuits. Isolation is achieved by using an LED to generate a signal which is sent through an optical medium and detected on the other side of the medium by a light-sensitive device such as a phototransistor or photodiode. The HCPL-7721-320E is an optoisolator that provides isolation between input and output circuits with its logic output.

The HCPL-7721-320E optoisolator is a three-channel output logic isolator with an input LED which is supplied with 5 VDC current and an output of 5 VCMOS up to 13.5 MHz. Its low/high output state is typically 25/75 percent, with a guaranteed maximum pulse width distortion of 10ns. The power dissipation of the HCPL-7721-320E is 0.2 W, with a propagation delay time of 2.6 uS to 8.3 uS depending on the input voltage. The broad input LED voltage range is 1.7 V to 5.8 V.

The HCPL-7721-320E includes a three-channel logic output, which provides a unique capability for some applications. The built-in optoisolator circuit insulates the system, protecting both input and output circuits against electrical hazards such as transients, ground potential mismatches, and inductive spiking. Moreover, it prevents the input circuits from interfering with or controlling the output circuits.

In terms of applications, the HCPL-7721-320E is designed to be used in commercial and industrial systems such as computers, programmable logic controllers, and relay systems. It can also be used in medical devices, automotive equipment, and communications systems, as well as in applications that require miniature components. The HCPL-7721-320E optoisolator is useful for providing logic level conversion and isolation in such applications.

The HCPL-7721-320E optoisolator works on the principle of optoelectronic conversion of signals from one form of energy to another. The design consists of an infrared LED (emitter) which is optically coupled to a photodiode (detector) array within the plastic housing. Electrical energy is converted into light when the LED is energized and the resulting pulse of light is detected by the photodiode array located across the optical isolation gap. The photodiode then converts the light back into electrical energy, allowing the output signal to be logic-level isolated from the input signal.

The HCPL-7721-320E optoisolator is a small, reliable, and cost-effective solution for providing logic level conversion and isolation. Its three-channel output, wide input voltage range, and maximum pulse width distortion of 10us make it suitable for a variety of commercial and industrial applications that require signal isolation, logic level conversion, and miniature components. The optoisolator works on the principle of optoelectronic conversion of signals, and is capable of providing reliable operation in extreme conditions.

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