BD139
NPN Medium Power Audio Driver Transistor
You may see these listed as
BD139-10 or BD139-16. This is similar to the gain grouping
denoted by the C suffix on the BC549. The -16 suffix
indicates the higher gain grouping. You can use either in
this circuit. Alternatives
that will definitely work in this circuit are BD137, BD135.
Navigate
Up
Recent edit history:
24-NOV-2025: self canonicalised, direct refs