Have SO(P)X components 2.54mm, 1.27mm or smaller pin spacings?
You are correct that SOIC (as defined by JEDEC / IPC7351B) has 1.27mm pitch contacts.

SOP, TSOP, SSOP and TSSOP are expected to have a smaller pin pitch, but there is no actual standard that requires it.

The JEDEC definition of SOP.

Some packages do meet certain JEDEC registered packages, but as you can see from the screenshot, I am free to define a SOP / TSOP package with 2.54mm pitch pins if I choose to do so. It will simply be unlikely to have a JEDEC package standard associated with it.



Some vendors simply define their own package and reference their internal drawing in the datasheet - this is common with Analog Devices (and Linear Technology which is now part of AD).