I'm cleaning up my desk and found a tube of 4mm QFN-28 ICs that I cannot identify. Any searches I've run come up with nothing.
There is no manufacturer's mark on them, just 3 lines:
9788E
T1909
BJDR
I believe that is a numeral 1, but might be an L or an I.
The center of the bottom of the chip has a heatsink area.
Anyone have a clue?