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OPA2188: what to do with unused pin?

Part Number: OPA2188

Hi all,

The customer is asking about the unused pins of OPA2188.

if we only use rail B, should we left the Pin 1/2/3 floating or it has to be connected to GND?

or there will be some issue and we should pay attention to?

thank you for your help.

Best Regards

Evan