HCPL3700S

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HCPL3700S belongs to optocouplers - Transistor, Photovoltaic Output, audio line drivers, fiber-optic communications, remote sensing and feedback devices. This AC/DC optoisolator consists of an infrared emitting LED coupled with an NPN silicon phototransistor, all integrated within one plastic package. The HCPL3700S offers outstanding performance characteristics in terms of current transfer ratio and low noise.

The application of the HCPL3700S contains AC/DC coupled signal transmission, where protected DC or AC logic isolations are required. This technology can reduce the coupling of unwanted noise or spikes that would otherwise occur when transmitting sensitive analog and digital signals without an optoisolator. The HCPL3700S provides this isolation protection for a variety of signals, including low voltage, low current signals, or higher voltage, higher current signals.

The working principle of HCPL3700S follows the same theory of operation as a regular optoisolator. Internal to the device, an infrared LED is mounted in an isolated package, with a lead extending out of the package to the electrical connection terminal. On the opposite side of the package, an NPN silicon phototransistor is used as the detector device for the received LED light. The LED and phototransistor are arranged side by side in the package so that the light emitted from the LED can directly enter the phototransistor without any external interference.

When power is supplied to the LED, it will emit infrared light towards the phototransistor. When the phototransistor detects the light, it will turn ON and create a low-current output. This output is in direct proportion to the light intensity, and it will turn OFF when the light is blocked. The resulting output can then be used to drive a load device, or amplified to create a larger output signal.

In addition, the HCPL3700S features a wide dynamic range from low current (200µA) to a maximum of 200mA. The device also offers a high response speed of up to 10kHz, with excellent common-mode rejection. The package is available in a variety of sizes ranging from 6 pin to 16 pin, for easier routing and wiring. This high-current, fast-switching optocoupler is ideal for applications in different kinds of sensing, remote control, feedback, logic isolating, switching, and audio applications.

In conclusion, the HCPL3700S is an excellent optoisolator device offering a high performance for AC/DC coupled signal transmission. Its robust construction ensures reliable and consistent operation, even in extreme conditions. With its wide dynamic range and high response speed, the HCPL3700S is suitable for a wide range of applications, such as audio line drivers, remote sensing, fiber-optic communications, logic isolations, and feedback loops.

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