NPN vs PNP Transistors as CommonEmitter Switches
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NPN and PNP transistors are two complementary types of bipolar junction transistors (BJTs). They both work the same way: when current flows thru the Base-Emmitter junction, the transistor turns on , and creates a current path through the Collector-Emmitter junction. The amount of current that will flow through the C-E junction (our Load current), is determined by the amount of current flowing thru the B-E junction (our Control current). (The C-E current is typically larger than the B-E current, and it's equal to the B-E current multiplied by some value, called hFE or common emitter current gain .) • The only significant difference between an NPN and a PNP transistor is that to turn on an NPN transistor, current flows IN to the Base and OUT of the Emitter; we accomplish this by applying a positive voltage to the Base relative to the Emitter. To turn on a PNP transistor, current must flow IN to the Emitter and OUT of the Base (the opposite direction of NPN), and to accomplish this we a apply a negative voltage to the Base RELATIVE TO the Emitter. That is why you see things like -5V in a datasheet for PNP. Usually the Emitter is common and thus a voltage reference for the Base. • Bipolar transistors are often used as simple switches in a common emitter configuration. For NPN transistors, we tie the Emitter to ground and turn the transistor on by applying a voltage to the base that is higher than ground; the Collector provides a switched ground output (either open or tied to ground). • For PNP transistors, we tie the Emitter to our positive power supply rail, and turn the transistor on by applying a voltage to the base that is lower than the positive power supply rail; the Collector provides a switched positive output (either open or tied to the positive power supply 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