Are you trying to substitute a part in a design or repair a board/boards? Both have their challenges.
The basic structure of logic parts is not too hard. Your part is the 74AHCT1G14, automotive qualified, in a SOT353 package (which has many other names; that's a whole other discussion). Breaking it down:
- Whether you need automotive qualified parts is something for you to decide. The parts are identical except for screening/testing/etc.
- 1G14 is a single Schmitt trigger inverter. Best to keep this the same. In certain circuits the 1G04 inverter might be suitable.
- AHCT is the logic family: Advanced High-Speed CMOS, TTL-Compatible
- Advanced CMOS is rarely necessary, it is often the case that HC/HCT works just as well. But not always.
- TTL compatibility, again, may or may not be needed. It is more useful if 5V logic is around somewhere, and less useful if it is not.
So there are four parts I would consider, sticking to 1G14s and ignoring AEC-Q100 automotive qualification:
- 74AHCT1G14
- 74HCT1G14
- 74AHC1G14
- 74HC1G14
All are available from at least one manufacturer, often more than one. Be sure the correct package is also available. There are other parts still if those are not suitable, but their appropriateness is harder to judge without schematics.
You will need to know the design rather well to make many of these decisions. If you are repairing something, well, all it has to do is work well enough for your buyer, once.