Infineon BFR740 - 42GHz BJT : weekend die-shot

Infineon BFR740L3RH - bipolar SiGe RF transistor with transition frequency of 42Ghz in a very small leadless package (TSLP-3-9 - 0.6×1×0.31mm).
Die size 305x265 µm.



After metal etch we can see that it's not that simple:


Main active area (scale 1px = 57nm):