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OPA991: Failure mode - power before signal present

Part Number: OPA991

Hi - 

Customer is reporting an issue where they are powering the op-amp before their signal gets to the input of the op amp. Not sure the state it is in prior to signal present, might be floating? I don't have schematic and I'm also not sure the configuration of how they are using it. 

They said they were seeing permanent damage on the op-amp and had to add a diode to protect it from this scenario. 

Question for you is - have you seen this type of failure before? Any watch-outs you have with regards to avoiding this failure mode? 

Tyler