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When NPN transistors are used in the most common amplifier configurations, they require a power supply with positive polarity with respect to common terminal. PNP transistors instead require a negative power supply. Over many years the positive power supply has become a design standard. This means that, for "Common Emitter" and "Common Collector" amplifiers, NPN transistors must be used. The same was once true for logic circuits: for positive power supplies, the logic gates would be built from N-channel FETs. But since the 1980s an improved setup has been used: CMOS logic which is built from approximately equal numbers of P-channel and N-channel transistors.
npn is mostly used because in npn electron current is greater the hole current.whereas in pnp hole current is greater than electron current. it is a people choise and basicaly and a manufacture choice. nobody wants to be negative. logic chips were developed for positive potential that doesn't mean that these chips cannot be used at a negative potential quite the contrary as long as the chip sees a positive voltage across them they work. you may develop a computer whereb\y the logic is gnd as positive and -5v as -vss. so you see it is a human choice.
Wiki User
∙ 15y ago
Wiki User
∙ 11y agoThere are two basic reasons for the preference for NPN BJTs over PNP devices:
- The mobility of N type charge current carriers (negative electrons)in silicon (Si) is more than two times greater than the mobility of P typecharge carriers (positive holes) in Si. Resulting in faster transistor operating speed.
- The mass processing of Si based BJTs and integrated circuits (ICs) are mosteconomically manufactured using large N type silicon wafers.
Wiki User
∙ 12y agobeacause i dont know how to use pnp transistor so its better u also use a npn transistor. if you dont want to use a npn transistor then dont use a transistor. haha as simple as that. isn't it?
" there is no charge for awesomness !!"
Wiki User
∙ 11y agohigher current carrier mobility, resulting in faster speed.
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Why you use NPN transistors rather than PNP?
Switching is faster in NPN transistor than PNP. Because movement of electrons is faster than holes.
Why is BC547 better than SL100 transistor?
Bc100 is an npn transister. if we know vlsi/cmos u will come to know about npn & pnp configurations.
What are the functions and empowerment of PNP as per PNP laws?
pnp and npn transistor
Is BT169 a npn or pnp transistor?
BT169 is neither an NPN nor a PNP transistor. BT169 is a thyristor, otherwise known as a silicon controlled rectifier.
Can be replace npn transistor series regulator with pnp?
no
How do you know if a transistor is a PNP or an NPN?
To know if a transistor is PNP or an NPN,the following should be verified:For a PNP transistor, the base-collector junction is forward biased while the base-emitter junction is reversed biased.For an NPN transistor, the base-emitter junction is forward biased while the base -collector junction is reversed biased.
Difference between NPN and PNP?
NPN and PNP are transistor types. The difference in the way the layers of semiconductor material are doped with impurities.
What is difference between npn ans pnp transistor?
NPN and PNP transistors function in essentially the same way. The power supply polarities are simply reversed for each type. The only major difference between the two types is that the NPN transistor has a higher frequency response than the PNP-because electron flow is faster than hole flow. Therefore high frequency applications will utilize NPN transistors.
Field-effect transistor NPN or PNP?
NPN, PNP only classified to BJT, while FET classified as P-channel , N-channel
Transistors Basic material of?
silicon ang germanium there are two types of transistor \ 1. PNP 2. NPN silicon ang germanium there are two types of transistor \ 1. PNP 2. NPN
Is the pnp transistor in common collector can be replaced with npn transistor?
No. The PNP and NPN transistors are exactly opposite each other in polarity. You cannot just replace one for the other without redesigning the circuit.
What is the major difference an NPN transistor and a PNP transistor?
The NPN transistor has its conduction curve where the base is more positive than the emitter, while the collector is also more positive than the emitter. The PNP transistor is exactly opposite, with its conduction curve where the base is less positive than the emitter, while the collector is also less positive than the emitter.
