4N25 footprint, schematic symbol and 3D model by Vishay

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4N25 Details

The maximum allowable voltage that can be applied to the input pins is 5V, exceeding this voltage 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 datasheet's thermal derating curves.
It is recommended to follow good PCB layout practices, such as keeping the optocoupler away from high-voltage traces, using a ground plane, and maintaining a minimum creepage distance of 1.5 mm between the input and output pins.
The 4N25 is not suitable for high-frequency applications due to its limited bandwidth (typically 10 kHz). For high-frequency applications, consider using a high-speed optocoupler like the 6N137 or 7MBI100.
To protect the 4N25 from EOS, use a voltage limiter or a transient voltage suppressor (TVS) on the input pins, and ensure that the device is operated within its recommended voltage and current ratings.

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