This standard establis es quality specifications for BC 5 4 9B low-power, low-nois bipolar transis or types; BC 54 9 C; BC 550 B; BC 550 C; BC 55 9 B; BC 55 9 C; BC 56 0 B; BC 560 C.
NC 66-16-1987 history
1987NC 66-16-1987 Electronic and Electrotechnical Industry Low Noise and Power Bipolar Transistors. Quality Specifications