The maximum allowable voltage that can be applied to the input pins is 5V, exceeding which may cause damage to the device.
To ensure reliable operation in high-temperature environments, it is recommended to derate the device's current and voltage ratings according to the temperature derating curve provided in the datasheet.
It is recommended to follow good PCB design practices, such as keeping the optocoupler away from high-voltage traces, using a ground plane, and maintaining a minimum spacing of 1.5 mm between the optocoupler and other components.
The 4N35 is not suitable for high-frequency applications due to its limited bandwidth (typically up to 10 kHz). For high-frequency applications, consider using a high-speed optocoupler like the 6N137 or 7N137.
To protect the 4N35 from EMI, use shielding, filtering, and grounding techniques, such as placing the optocoupler in a shielded enclosure, using EMI filters, and connecting the device to a solid ground plane.
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