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ISO7730: Connect NC pin(pin 6) to GND

Genius 15690 points
Part Number: ISO7730

Hello,

My customer is considering to replace a 4ch(4:0) digital isolator to ISO7730.
They actually use only 3ch although they are using 4ch version.
Now pin 6 is directly connected to GND because they don’t use this channel and they don’t want to change the layout.

Now pin 6 of ISO7730 is NC pin.
Is it acceptable to connect this Pin 6(NC) of ISO7730 to GND directly?

Regards,
Oba