The recommended operating temperature range for the 4N32 is -40°C to 100°C.
To ensure reliability in high-temperature applications, it's recommended to derate the device's current and voltage ratings according to the temperature derating curve provided in the datasheet.
The maximum allowable voltage for the 4N32 is 70V, but it's recommended to operate the device at a voltage below 60V to ensure reliable operation.
The correct resistor value for the input LED of the 4N32 depends on the input voltage and the desired current. A general rule of thumb is to choose a resistor value that limits the current to 10-20mA.
The typical CTR of the 4N32 is 100%, but it can vary depending on the specific device and operating conditions. The minimum CTR is guaranteed to be 50% at an input current of 1mA.