JAN4N48A

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Optoisolators provide electrical isolation between different circuits, systems and operating voltages. They are available in various shapes, sizes and compositions. One of the more commonly used optoisolators is the JAN4N48A transistor photovoltaic (PV) output optoisolator. It is a four-pin through-hole device, versatile and easy to use.

The JAN4N48A optoisolator has a phototransistor connected in series with an LED. The phototransistor is an NPN type, Gallium Arsenide Infrared Emitting Diode with a common base circuit. It has an active collector current of around 8 mA and a maximum reverse voltage of 40 V. The LED is a GaAsP/GaAlAs. It has a forward current of 2 mA, an emitter diode forward voltage drop of 2 V, and an anode-emitter leakage current of 25 nA. Anode-base leakage current is less than 1 nA.

An optoisolator device works by having a light, usually from an LED, modulate a current across a component. In the case of the JAN4N48A, the top cathode is used for the LED, while the bottom cathode is connected to the phototransistor collector, forming a photovoltaic effect. In other words, when light is shone on the LED, it produces a current, which is then transmitted to the base of the phototransistor, causing a voltage to be generated in the collector terminal.

The JAN4N48A optoisolator is used in applications where both electric and optical isolation are required. It has a wide range of uses and can be used in systems for switching applications, power supplies, digital logic circuits, communications systems, sensing and control systems, and more. It is also useful in automobiles as it can sense excessive levels of radiation from X-rays and gamma rays.

In terms of safety, the JAN4N48A also provides a certain level of isolation between circuits. This is because, although the LED and phototransistor are electrically connected, they are also optically isolated from each other. The phototransistor is activated by the light of the LED, but does not pass any current to the emitter terminal. Therefore, it prevents electric shock and possible short-circuits in the system.

The JAN4N48A optoisolator is relatively inexpensive, making it a popular choice for a wide range of applications. It is easy to work with, and provides a simple and reliable way of providing both electrical and optical isolation for various electrical circuits. It is also quite versatile, allowing it to be used for systems with different voltage levels and complex switching applications.

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