It consists of three terminals, these are emitter (E), collector (C), and base (B). The BC547 is an NPN Bipolar Junction Transistor (BJT).And the gain grades (A,B,C) line up too so it's really the BC549C you want to replace the 109C (gain about 400 … david futbin Transistors, How do they work? - YouTube BC547 NPN Transistor: Pinout, Datasheet, and Circuit - Utmel Web Direct replacement for the BC109 would be the BC549 rather than 547 (yes there was a BC107!).* Calculating the corresponding collector potential Vc you will see that the BJT cannot work as desired. identical to the current Ic (at the collector node). 5.3V * Now you can calculate the current Ie, which is app. * So the emitter voltage should be (when the BJT works as desired) Ve=app.BC547 Mfr.: onsemi / Fairchild Customer #: Description: Bipolar Transistors - BJT NPN 45V 100mA Lifecycle: Obsolete Datasheet: BC547 Datasheet (PDF) ECAD … david fx trader Web.
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