I was comparing the datasheets for the three related CMOS Op Amps from TI: TLC2252, TLC2262, and TLC2272. TLC2252 is the micropower version; TLC2272 is the high-performance version; TLC2262 is offered as a compromise between them.
The equivalent schematics only seem to differ in the area around Q9. In TLC2272, Q9 is part of a current mirror. In TLC2252, it is diode-connected. In TLC2262 just hanging there as a "one-terminal device" (unless the substrate connection is significant.)
Does Q9 have a function in TLC2262, or is this just an artifact of the manufacturing process? (I.e. are they all made from the same die and trimmed to make the three different versions?)