Introduction to Bipolar Junction Transistor (BJT)

In this video, the Bipolar Junction Transistor, its different regions of operation, different configurations, and the working is briefly explained.
By watching this video, you will learn the following topics:
0:00 Introduction
0:20 What is BJT?
1:12 Construction of BJT
3:24 Different Regions of Operation of BJT (Active, Saturation, and Cut-off)
6:20 Symbols of NPN and PNP transistor
7:05 Different Configurations (CE, CB, and CC)
8:03 Working of BJT
12:30 Different Currents in BJT
What is Bipolar Junction Transistor (BJT)?
Bipolar Junction Transistor is a 3 terminal semiconductor device that can be used as a switch or as an amplifier in electronic circuits.
The reason it is known as bipolar is because there is a flow of current in BJT due to two types of charges (unlike FET)
Holes and Electrons
Construction of BJT:
The BJT consist of the three doped regions. The three regions of the BJT are known as Emitter, Base, and Collector.
And based on the doping of the three regions, it is known as either NPN or PNP transistor.
In BJT, the emitter is heavily doped, Base is lightly doped and the collector is moderately doped.
The width of the base region is much smaller than the other two regions.
The job of the emitter region is to supply the electrons (that's why it is known as the emitter)
While the collector region collects the electrons supplied by the emitter.
Different Regions of Operation of BJT:
The BJT can be operated in the following regions:
1) Active Mode (BE Junction is Forward Biased, CB junction is reverse biased)
2) Cut-off Mode (Both BE and BC junctions are reverse biased)
3) Saturation Mode ( Both BE and BC junctions are forward-biased )
4) Reverse Active Mode (BE junction is reverse biased, BC junction is forward biased)
Different operating Configurations of BJT
When BJT is used as an amplifier, it can be configured in the following configurations:
1) Common Emitter (CE ) Configuration
2) Common Base (CB) Configuration
3) Common Collector (CC) Configuration
And at the end of the video, the working of the BJT in the active region has been explained and the relationship between the different BJT current has been established.
In this video, the basics of the BJT is explained. By watching this video, you will learn the different configurations, different types of BJT, symbols of BJT, working of BJT and different current and their relation in BJT.
This video will be helpful to everyone in understanding the basic of Bipolar Junction Transistor (BJT).
#BJT
#Transistor
#BipolarJunctionTransistor
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[@ALLABOUTELECTRONICS]

The timestamps for the different topics covered in the video: 0:20 What is BJT? 1:12 Construction of BJT 3:24 Different Regions of Operation of BJT (Active, Saturation, and Cut-off) 6:20 Symbols of NPN and PNP transistor 7:05 Different Configurations (CE, CB and CC) 8:03 Working of BJT 12:30 Different Currents in BJT For more Solved Examples on the BJT, check out this playlist: kzbin.info/www/bejne/mKqzc42jeMummJo

[@gunanagasindhu9592]

while operating in active region at 3:24 it is in common base , but it is not in the case at 8:01 (it is in common emitter config and the condition Base Emitter forward bias and Base Collector reverse bias doesn't make any sense ) pls explain sir

[@user-vj5wd6wq1v]

Differentiate between NPN and PNP transistors. According to you which one is going to switch faster. ؟؟؟؟؟؟

[@sudityagupta9193]

🎸

[@briankiprono4580]

3.35 you said R-B is reverse biased, should be B-R is reverse.

[@94D33M]

@@gunanagasindhu9592 I too went back and saw that this was the case. Anyone have an explanation?

[@josephsagi3926]

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[@solapowsj25]

It's not correct. As per electronic engineering.

[@albertoi.cruzgalvan3446]

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[@amitsharma-rt2ht]

But he should off the add

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[@pwalterjerome1987]

awesome video i didn't understand anything in lecture but now my concepts are crystal clear and amplified as a transistor in active region. keep doing this good job. your channel deserves huge appreciation

[@deekshas3936]

Thanks a lotttt!!! I hadn't understood how amplification takes place in college lecture and therefore I couldn't follow the concepts that came afterwards, but now I understand it clearly. Will surely watch the other BJT videos. Keep up the good work!

[@yiningwang1571]

Thank you so much! You really know how to explain BJT clearer than my professor

[@j05hb3an7]

I was so lost when this was explained to me in class. Thank you for making such a clear and concise video.

[@vladododerovic4479]

Your explanation made everything so easy to understand! Thank you so much!

[@jyothiswaroopsantu]

Excellent explanation. BJT is always a topic of confusion for me and these videos just simplified it a lot for me

[@mcbotface]

Thank you for uploading this video as requested. Thank you !! 😍😍

[@teammadmax4905]

감사합니다 최고의 BJT 강의 입니다. 전자회로에 입문하면서 하나하나 생소한 개념이 많아 원서를 독학하는 것이 버거 웠었는데 이 영상을 보고 트랜지스터가 어떻게 작동하는지 잘 알게 되었씁니다 다른영상도 찾아볼게요!~!

[@monalishabal4910]

thank you from bottom of my heart , 5stars , crystal clear concepts

[@priyanshukasaudhan786]

Best channel on youtube , specially short notes in the descriptions are so helpful

[@i_am_anchal434]

No one writes the notes in the description except you....thank you sir

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[@MuhammadFaizan-br3cr]

Thanks a lot brother. You really made BJT easy to learn for me.... ! Keep up the good work!

[@_AnanyaMukherjee]

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[@debashrutibhattacharjee5023]

Seamlessly explained! Thank you!!

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wow. awesome ! just awesome. explained in a very good manner. easy to understand. thank you very much for uploading this video sir. 6 stars out of 5. (star amplification :)

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[@ianespinosa5056]

Thank you for posting this. I am an EE student at CalState Long Beach and the EE department there is terrible, especially for the electronics concentration. I think I learned more form this video than I did from the utterly useless professors that teach it at CalState.

[@smittyflufferson1299]

Transistors are tough. This video was a great introduction to some of the essentials

[@StupidBadyXD]

I think you could focus more on explaining the physic than the equations. Equations are secondary.

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???

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bro can you give some brief explanation of single ended and differential inputs

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[@savithaag499]

Thank you so much. Great explanation.

[@susmitsingh1775]

Thanks for the explanation!

[@farhanupaul]

Sir your videos are amazing. So when we are doing Biasing we are not actually changing the polarities of the DC biasing but instead for example in saturation the collector voltage becomes larger than base which is larger than emitter, right?

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I wish it were that easy to learn when I was graduating! :P

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Very clear explanation 👍 , Thank you sir Vedio is helpful to me

[@smitanghan4565]

I'm too confused in sign notation, VBB, VCC, VBE, VCE,... Thank you so much to clear my confusion Thank you, sir...

[@ridhimachopra7215]

Amazing video!Thanks!

[@yandere3k759]

Thanks for sharing.

[@sudhamani3576]

It's simple way of know about BJT... Very nice sir..

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Perfect explanation... I only have trouble understanding your english (im not fluent english speaker)

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neither is he, its the indian accent

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[@willwill3917]

A very nice and well explained introduction to BJT

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I bow down my head for your explanation bro.. how briefly it was🙏

[@khanhhuyen8630]

Thank sir, it makes sense, hope that in the upward videos you can add subtitle because I'm not good at listening to English

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Watching this 45min before exam🙂

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Thank you, sir!

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Please upload further videos great. Explanation

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very very good explaination, all concepts in theory are based on sense...

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very clear explanation provided

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Thank you very much

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Awesome Video for revision 👍🙂

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[@ishitwaupreti9767]

Having some doubts in transiator biasing But still video is very awesome. Thanks for explaining.

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You are in which college?

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from egypt good for you

[@abhinavreddy2768]

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[@tayyabahaider3872]

Thanks alot..it was a great help

[@dineshj1998]

awesome waiting for your upcoming videos about BJT

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set this week for all about electronics..started sterday, watching all your videos one by one.great explanation. will complete all the videos...b4 you post the nxt video..grt work...keep going...

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[@ALLABOUTELECTRONICS]

Very soon the next video will be posted.

[@aditianand1565]

Thank you for the video

[@TSulemanW]

Nice and simple explaination

[@joohigarg8556]

Good demonstration

[@yassinesafraoui]

thank you so much for these videos, they really help, btw, I have a question concerning MOSFET transistors, I did see that you made a playlist about them as well, and I wanna learn them, do I have to understand BJTs to understand MOSFET?

[@ALLABOUTELECTRONICS]

No, you can learn them independently.

[@dbchannel7131]

Sir.I have a question for this video.What application do you use to do this circuit.I see your video very easy to understand with explain.

[@SaiRam-ed5ze]

U r the masterpiece

[@mdrafiulislamrafi4268]

thank you so much boss

[@pragatigupta3550]

really awesome explanation : ) : )

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No more words ...killing explain ation

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I love you man, Thank you

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Thanks brother .keep it up..

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Sprb explanation sir

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bahut acha bate hai sir

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Excellent !!

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It was very helpful. Thank You. Please make the sound quality better.

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you're a legend

[@timo9madrid7]

Thank YOU so much

[@aniketshinde1031]

Hi

[@aniketshinde1031]

Hi

[@tanmaykumar1178]

11:27 why will it flow towards the positive terminal as now after the combination of holes and electron an atom is resulted which is electrically neutral?

[@aryamanz29]

emitter is highly doped so some get neutral but most of them are moved towards collector side and contribute as "Ic"

[@emilcalilov8910]

Great video. I didn't get the part why when electrons recombine with holes they flow towards positive terminal? What attracts them?

[@kailasbafna8397]

As electrons are negatively charged they are attracted towards the positive charge....

[@unnati___]

Thanks a lot😃

[@adarshmishraf2-049]

Very nice class sir❤

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Thank you 😊

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[@dhanujabpillai3964]

Good class sir