4N25 footprint, schematic symbol and 3D model by Lite-On

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4N25 Details

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 datasheet's thermal derating curve.
The recommended input current for the 4N25 is 10mA to 20mA, depending on the specific application and required output current.
The 4N25 is not suitable for high-frequency applications due to its limited bandwidth (typically up to 10kHz). For high-frequency applications, consider using a high-speed optocoupler like the 6N137 or 6N138.
To protect the 4N25 from electrical noise and EMI, use proper PCB layout techniques, such as separating the input and output circuits, using shielding, and adding noise filters or chokes as necessary.

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