H11AA3SM

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An optoisolator, or an optocoupler, is a form of electrical isolation that uses light to transmit signals. According to the type of signal transfer, they are categorized into optocouplers that use transistors, photovoltaic outputs or both for signal isolation. In this article, the focus is on H11AA3SM - an optoisolator with transistor and photovoltaic outputs.

H11AA3SM optoisolators consist of an LED which is optically coupled with a phototransistor on a single chip. It offers reliable performance with a wide common-mode interference voltage up to 5kV/μs. The optoisolator provides electrical isolation by providing an insulated barrier between devices that would otherwise be connected electrically.

The LED in H11AA3SM is in a 6-pin package and has an open-collector phototransistor output, providing a very high input-output isolation. When the LED is activated, the phototransistor’s base-emitter junction is turned on, causing the collector current to flow, which is a primary output of the device. The output current is 350 mA, with a compatible current gain of up to 500:1.

The LED is optically coupled with a photovoltaic device, which is made up of two separate layers of semiconductors, resulting in a high degree of electrical isolation between the device’s input and output. The photovoltaic device produces a voltage signal that is proportional to the light intensity incident on it, and is then available at the output as a secondary output of the device.

The H11AA3SM optoisolator is widely applied in areas such as power management, automotive electronics, motor control, high-speed switching, communications and medical instrumentation. It is designed with a CMOS-compatible process, providing low power consumption, fast switching speeds and reduced size. Additionally, it requires no external component and is implemented in a single-in-line package.

In conclusion, the H11AA3SM optoisolator provides electrical isolation between its input and output, while allowing the precise transfer of current and voltage signals. With its wide common-mode interference voltage, fast switching speeds and low power consumption, the device is applicable in a variety of applications that require electrical isolation and signal transmission.

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