4N28S-TA

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The 4N28S-TA Optoisolator - Transistor, Photovoltaic Output is a semiconductor output device integrating a GaAs infrared LED with a photovoltaic detector with a PNPN silicon switching transistor. It combines the coupling isolation properties of an optocoupler with the current handling capability of a transistor output. It provides both a blocking and switching action between the input and the output. This Optoisolator provides a low level of output signal isolation from the input signal.

The 4N28S-TA Optoisolator provides a low voltage and current output switching signal for circuits operating from a single supply source. Without any further amplification, it produces consistent, reliable output signal in response to the input signal. It supports logic level inputs, making it highly suitable for digital or very low frequency applications. In addition, it has a wide output current range that can be adjusted through a range of resistors.

The 4N28S-TA Optoisolator allows signals to be transmitted without allowing the input and output circuitry to interfere with each other. This is achieved through the use of components such as an infrared LED, a photovoltaic diode, and a PNPN silicon switching transistor. The LED provides energy in the form of low-level light which is picked up by the photovoltaic diode. This causes a current to flow in the diode turning it on, and activate the PNPN silicon switching transistor. When the input signal changes, the LED will emit different levels of energy, causing an appropriate output current for the changing input.

The 4N28S-TA Optoisolator has a wide range of applications, including isolation relays, speed switches, timing circuits, pulse width modulation, and motor speed controls. It is also used in computer buses and digital logic blocks, hazardous instrumentation systems, and industrial automation systems. Its simple yet powerful design ensures reliable operation in a wide range of temperature, humidity, voltage, and current environments.

In summary, the 4N28S-TA Optoisolator - Transistor, Photovoltaic Output is designed for use as an optocoupler providing isolation of low power and current signals. It uses a combination of components such as an LED, photovoltaic diode, and a PNPN silicon switching transistor. This Optoisolator is particularly suitable for use in digital or low frequency applications, as it allows signals to be transmitted without any interference. It is widely used in isolation relays, speed switches, timing circuits, pulse width modulation, motor speed controls, computer buses, digital logic blocks, hazardous instrumentation systems, and industrial automation systems.

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