The transistor is made of two PN junctions very close to each other on a semiconductor substrate. The two PN junctions divide the whole semiconductor into three parts. The middle part is the base area, and the two sides are the emitter and collector areas. PNP And NPN are the two kinds ...
The main difference between a BJT and a MOSFET is that, a BJT operation depends on current and needs to be proportionately increased with the load, whereas a mosfet depends on voltage. But here the MOSFET gets an edge over a BJT, because voltage can be easily manipulated and achieved to t...
Image used courtesy of Simon Munyua Mugo In the circuit above Rb is required for limiting the output current from the digital logic gate. PNP transistor Switch A PNP transistor can be used in the same way as an NPN transistor. The difference is that in PNP, the load is always connected ...
PNP-transistor works as a switch: The Emitter potential for aPNPtransistor needs to be positive with respect to the Base. The transistor then functions as a solid-state "single-pole single-throw"(SPST)switch. The transistor becomes "OFF," operating like an open switch when a zero signal is...
Comparison between a PNP transistor and P-channel MOSFET: When the gate voltage is 4v LOWER than rail voltage, the MOSFET turns ON. The 10k resistor on the base of the transistor is needed to prevent the base current exceeding the amount of current needed by the transistor to deliver current...
And it’s actually pretty easy, once you learn the basics. I’ll focus on the two most common transistors here; theBJTand theMOSFET. The transistor works like an electronic switch. It can turn a current ON and OFF. A simple way to think about it is to look at the transistor asa rel...
region” or “ON mode” when using a bipolar NPN transistor as a switch as being, both the junctions are forward biased, IC = Maximum, and VB > 0.7v. For a PNP transistor, the Emitter potential must be +ve with respect to the Base. This is theworking of the transistor as a switch...
One 7CT1N will test a PNP and while it is in place the second 7CT1N can be used to select a transistor that is closely matching as pair. There are two curves worth paying attention when comparing two complementary transistors. The first Step in the curve closer to zero should be ...
Where, theIB(required)is the base current needed to keep the transistor latched in itsONstate. This feedback signal ensures that once the NPN or PNP transistor is turned on, the circuit remains latched in that state until forced to reset. ...
They have become much more popular than their current-driven predecessor, the BJT (Bipolar Junction Transistor). On the opposite end of switching spectrum, logic level MOSFETs prevail in the construction of processors and other small-signal devices due largely to their greater efficiency and high-...