REATURES
♦ PNP Silicon Epitaxial Planar Transistors for
   switching and AF amplifier applications.
♦ These transistors are subdivided into
   three groups A, B and C according to
   their current gain. The type BC556 is avail
   able in groups A and B, however, the types
   BC557 and BC558 can be supplied in all three
   groups. The BC559 is a low-noise type available
   in all three groups. As complementary types, the
   NPN transistors BC546 … BC549 are recommended.
♦ On special request, these transistors are also manufac
   tured in the pin configuration TO-18.