Bi-polar Transistors
Bi-polar Transistors| Components | Resistors | Capacitors | Inductors | Crystals | Diodes | Transistors |
| FETs | Triacs | Infra-red | ICs | LEDs | Speakers and microphones | Sensors |
| Power handling | Part number | Datasheets |
| Small signal | BC237B | Phillips Semiconductors |
| Medium signal | BFY51 | Philips Semiconductors |
| Large signal | BD139 | Philips Semiconductors |
| Power handling | Part number | Datasheets |
| Small signal | BC327 | Philips Semiconductors |
| Medium signal | BFX88, BC461 | |
| Large signal | BD140 | Philips Semiconductors |