H11A4S1(TB)-V

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Optoisolators, also known as optocouplers, use a solid-state device composed of an infrared LED and an output detector to provide electrical isolation between two circuits. The H11A4S1(TB)-V is a type of optoisolator, specifically a three-terminal, transistor output, photo-voltaic optoisolator. In this article, we’ll discuss the application field and working principle of the H11A4S1(TB)-V optoisolator.

The H11A4S1(TB)-V is designed for use in low voltage, low current signal transmission applications. The optoisolator is used primarily in the automotive industry, including applications such as automatic door locking/unlocking systems, power windows, and sunroof control. It is also used in other control systems and in industrial automation, where isolation of circuits is essential to prevent damage caused by short circuits or noise interference.

The H11A4S1(TB)-V features an isolated LED/PD (Photo Diode) assembly and a high-gain, low saturation voltage, three-terminal, NPN transistor output. The transistor output is very sensitive to light and can effectively isolate signals from 20% to 100% of their input. The device also features low power consumption of only 70mW with a maximum forward voltage of 25V and a peak collector current of 300mA.

In operation, the LED of the H11A4S1(TB)-V emits an infrared light when a forward voltage is applied to the LED anode. The light is then converted into electrical energy by a photosensitive semiconductor junction inside the device, which in turn generates a signal voltage at the output. The signal voltage is amplified by the NPN transistor, which is capable of driving a load such as a relay, solenoid, or other device.

The H11A4S1(TB)-V provides several additional advantages over conventional optoisolators. It is able to switch voltages up to 55V, both AC and DC, as well as other high voltage signals, without needing an additional power input. It also provides a high insulation resistance of greater than 500 megaohms. This is important to ensure that even in the event of a short circuit, no current will pass between the two isolated circuits. Additionally, the device features a wide ambient temperature range, from -40°C to +85°C.

In summary, the H11A4S1(TB)-V is a three-terminal, photovoltaic output optoisolator which is primarily used in the automotive industry and industrial automation for low voltage, low current signal transmission. It offers the benefit of providing electrical isolation between two circuits while still providing a high insulation resistance of over 500 megaohms. It is also capable of switching voltages up to 55V, both AC and DC, as well as other signals without needing an additional power input, and has a wide ambient temperature range.

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