Features
1) Ultra-low noise. (Excellent noise response at low Rg):
   NF=2.5dBTyp.
   (at f=10Hz. Ra=10Ω, VCE=-6V,
   lc=-3mA)
2) Low base resistance: rbD=-2Ω
3) Low voltage noise: en*0.55nV/VHz
   (at l0Hz, 10mA)
4) Complementary pair with 2SD786