The recommended operating temperature range for the 4N25SM is -40°C to 100°C, although it can withstand storage temperatures from -40°C to 150°C.
To ensure reliability in high-temperature applications, it's essential to follow proper derating guidelines, provide adequate heat sinking, and avoid exceeding the maximum junction temperature of 150°C.
The maximum allowable voltage for the 4N25SM's input diode is 5V, although it's recommended to operate within the specified maximum forward voltage of 1.4V to ensure reliable operation.
The 4N25SM is not suitable for high-frequency applications above 1 MHz due to its limited bandwidth and rise/fall times. For high-frequency applications, consider using a faster optocoupler like the 6N137 or 7MBI15F.
Choose a resistor value that limits the input current to the recommended maximum of 50mA. The resistor value can be calculated using Ohm's law, taking into account the input voltage and the desired current.
