TI Op-Amp Naming conventions

Could anyone tell me what the TI op-amp /NOPD designator means? I'm looking at the LF347BN and LF347BN/NOPD and struggling to find what /NOPD means.

Also: any links to the op-amp naming conventions used by TI? I haven't been able to find a comprehensive document. I have found out that the TI Tuscon and TI Dallas centers use completely different naming conventions.