I am dealing with such issues for a long period by now..
It has become a nonsense such simple markings once on the tables
you find that every fab use their own meaning for the letter
What is DIGIT-LETTER may be anything - from transistor to diode or regulator.
Someone at some point must put things at the proper serious level.
about 50% of smd I tried I found NOTHING AT ALL about it.
kinda dark age of serious electronics
Paul