Max Ratings
| Number | Type | Style | Vbe(sat) | Vce(sat) | Vceo | Vcbo | Vebo | Ic max |
|---|---|---|---|---|---|---|---|---|
| BC337 | NPN | CBE | 1.2v | 0.7v | 45v | 50v | 5v | 800 mA |
| BC327 | PNP | CBE | -45v | -5v | -800mA | |||
| 2N2222 | NPN | EBC | 30v | 60v | 5v | 800mA | ||
| 2N2907 | PNP | EBC | -40v | -60v | -5v | -600mA | ||
| 2N3904 | NPN | EBC | 40v | 60v | 6v | 200mA | ||
| 2N3906 | PNP | EBC | -40v | -40v | -5v | 200mA | ||
| S8050 | NPN | EBC | 20v | 30v | 5v | 700mA | ||
| S8550 | PNP | EBC | -25v | -40v | -5v | -700mA | ||
| C1815 | NPN | EBC | 50v | 60v | 5v | 150mA | ||
| A1015 | PNP | EBC | -50v | -50v | -150mA | |||
| S9013 | NPN | EBC | 25v | 45v | 5v | 500mA | ||
| S9012 | PNP | EBC | 25v | 40v | 5v | -500mA | ||
| S9014 | NPN | EBC | 45v | 50v | 5v | 100mA |
Styles
| Style | |
|---|---|
| EBC |
|
| CBE | Collector, Base, Emitter |
Calculating your Rb Value
| Precondition | Value |
|---|---|
| Vcc | 12v |
| Vbb | 3.3v |
| NPN BC337 | |
| Vbe(sat) | 1.2v |
| Vce(sat) | 0.7v |
Ic = 12v/155 = 78mA
Ib = Ic/10 = 78/10 = 7.8mA
Vb = 3.3v - Vbe(sat) = 3.3 - 1.2 = 2.1v
Rb = Vb/Ib = 2.1/0.0078 = 269 ohms
Tested with 220 ohms and it worked.