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OPA657: Difference between OPA657N/250 and OPA657NB/250

Part Number: OPA657
Other Parts Discussed in Thread: OPA656

My customer wants to know the difference between OPA657N/250 and OPA657NB/250.
Are there any spec difference ?
Customer can replace from OPA657N/250 to OPA657NB/250 directly ?
Please let us know if there is anything they need to take care.

Best Regards

Koji Sakurai