ElectronicsNotes
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| - | |Ve > Vb | + | |Ve > Vb, Vc > Vb |
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|Forward active | |Forward active | ||
|Vc > Vb > Ve | |Vc > Vb > Ve | ||
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Latest revision as of 17:25, 14 October 2016
Transistors
Electronics can easily flow from the p-type base to the n-type collector as long as the base-emitter junction is forward biased (meaning the base is at a higher voltage than the emitter).
In a way, a transistor is like a variable, adjustable resistor.
Four modes: Saturation (short circuit), cut-off (open circuit), active (current from collector to emitter is proportional to current flowing into the base), reverse-active (like active except current flowing in reverse)
Voltages from base to emitter (Vbe) and base to collector (Vbc) set the transistor's mode.
| Mode | Condition |
| Reverse active | Vc < Vb < Ve |
| Saturation | Ve < Vb, Vc < Vb; Vc must be slightly greater than Ve |
| Cut-off | Ve > Vb, Vc > Vb |
| Forward active | Vc > Vb > Ve |
