If I connect the inverting input directly to an APD, I’m concerned about damaging the input if the APD breaks down or if the power supplies aren’t cycled correctly. For example if the APD bias is applied before the OPA855 power and there is no virtual ground, that could result in a high voltage on the non-inverting input. The OPA855 has internal input protection diodes. I could limit the current in the APD to ensure that I don’t exceed the rated current of the input protection diodes. The only problem is that I haven’t found information in the data sheet regarding the maximum current for the input protection diodes. Is this specification available?