4N25FR2VM

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Optoisolators - Transistor, Photovoltaic Output

The 4N25FR2VM is a photovoltaic output optoisolator with a transistor output. Its primary application is isolating voltage sensitive circuits from voltage spikes and noise that can be generated when switches in series with an output circuit are closed or open. It is designed to withstand up to 250V peak input voltage.

An optoisolator (also called an optocoupler, photocoupler or optical isolator) is a device that provides electrical isolation between two circuits using a light-emitting diode (LED) and a photosensitive device in the same package. This allows current in one circuit to be completely isolated from currents in the other circuit, which is particularly useful in preventing damage to sensitive circuits.

The 4N25FR2VM contains a LED and a photosensitive Transistor integrated in one package. The LED is driven by an input circuit, and the light emitted is detected by the transistor. This transistor switches on and off in response to the light emitted by the LED. This optoisolator is also known as logic output type because it is also used for logic level isolation.

The 4N25FR2VM has four connection pins: Anode, Cathode, Emitter and Collector. The anode is connected to the input voltage that will drive the LED. The cathode is connected to ground, and the emitter is connected to the transistor collector. The emitter is then connected to the output voltage that the optoisolator must switch on or off.

The 4N25FR2VM has a maximum current rating of 20mA and can be used to isolate circuits with different power levels. It is also suitable for use in data and signal transmission systems, and is a very cost effective device compared to other optoisolators.

In operation, the 4N25FR2VM isolates two circuits. An input voltage is applied to the anode side of the optoisolator, which drives the LED and emits light. The photosensitive Transistor detects this light and switches on or off the output voltage at the emitter. When the output voltage is on, electric current is able to flow from the input to the output voltage, thus isolating the two circuits.

The 4N25FR2VM optoisolator is mainly used to prevent electrostatic discharge (ESD), electrical spikes, surges, and noise generated when switches in series with the output circuit are closed or opened from damaging the sensitive circuits. It can also be used to isolate two circuits with different power levels, and also for logic level isolation. It is a very cost effective yet reliable device that can be used in many applications.

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