4N26 footprint, schematic symbol and 3D model by Vishay

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4N26 Details

The 4N26 can operate safely between -40°C to 100°C, but the optimal operating temperature range is between 0°C to 70°C for reliable performance.
To ensure proper biasing, the input diode should be forward-biased with a current between 1mA to 10mA, and the output transistor should be biased with a collector current between 1mA to 20mA.
To minimize electromagnetic interference (EMI) and ensure reliable operation, it is recommended to keep the 4N26 at least 1mm away from other components, and use a ground plane or shield to reduce noise coupling.
While the 4N26 can operate at high frequencies, its bandwidth is limited to around 10kHz. For high-frequency applications, consider using a faster optocoupler like the 4N35 or 4N36.
To protect the 4N26 from electrostatic discharge (ESD), use ESD-sensitive handling procedures, and consider adding ESD protection devices such as TVS diodes or ESD arrays to the PCB design.

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