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Showing Results For: BJT & Bipolar Transistors

BJT & Bipolar Transistors

What are BJT and Bipolar Transistors?

A bipolar junction transistor, abbreviated as BJT, is a type of electrical transistor that utilizes electrons and electron holes to combine as a current transmitter. Unlike a unipolar transistor, which includes a field-effect transistor, a unipolar transistor makes use of a single type of signal transmitter. BJT & Bipolar Transistors can be used for switching or amplification by allowing a little current to be injected at one of their terminals to control a much greater current flowing between the terminals.

Bipolar transistors are compact in size, composed of three layers of silicon that consist of three-pin. This device is used to enhance or amplify current; a bipolar transistor does work as a switch. In total, two main types of transistors exist in this category, such as positive negative positive (PNP) or negative, positive negative (PNP). 

How is a bipolar transistor manufactured?

Bipolar transistor composition is carried out by integrating two signal diodes, one over the other, making two PN junction joints in a series, distributing a typical P or N terminal, composed of silicon that does not usually conduct electricity well enough. However, we may alter the behavior of the material and the electrons by adding specific compounds or impurities to silicon. This practice is known as doping. The doping procedure enhances the semiconductors' electrical conductivity.

How do bipolar transistors function?

Bipolar transistors make use of two fundamental functions, switching, and amplification. Since the device consists of three layers of doped semiconductor substances, distributing the transistor with signal voltage carriers enables the standalone component to work as an insulator or a conductor. This potential modification in the transistor design offers the transistor two primary functions, switching electronics called digital and amplification electronics called analog. 

Transistors come in plastic container or metal can variants, and mounting choices include panel, surface, and through-hole. The Base, the Collector, and Emitter are the three terminals or pins shared by everybody. They can also be found as:

  • Digital Transistors - are composed of semiconductor objects, primarily silicon, that transmit the current with small resistance. This also consists of three terminals for secure and easy connection with an external environment or circuit.
  • UJT Transistors - Manufacturing of a bar of lightly doped N-type silicon consisting of a small piece of heavily doped P-type material lined on one side. When the silicon bar is doped lightly, it practices very high resistance.

What are bipolar junction transistors used for?

Bipolar Junction Transistors employ two junctions between two semiconductor objects. These object types are n-type and p-type, which make spaces in single crystal materials. These junctions are basically created in several different ways, such as making variations in the doping of the semiconductor material because of its grown capability and using metal pallets to develop alloy functions, with that function being the diffusion of n-type doping substances into a crystal form. The original point-contact transistor was swiftly replaced by junction transistors due to their improved predictability and performance. Diffused transistors are a component of integrated circuits for analog and digital functions, along with other parts. A single circuit may produce hundreds of bipolar junction transistors for a very low cost.

What are the applications of bipolar transistors?

One of the most frequently utilized discrete components in electronic circuits and designs is transistors. In circuits made up of individual components rather than ICs, transistors are employed for the amplification of all forms of electrical impulses (integrated circuits).


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Renesas Electronics
Rohs Verified
2SC2334-AZ, Renesas Electronics
66 In Stock
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5 +
£ 1.11
10 +
£ 0.709
20 +
£ 0.691
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2SAR572DGTL, ROHM
44 In Stock
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25 +
£ 0.491
125 +
£ 0.416
250 +
£ 0.386
Panasonic
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DSC500100L, Panasonic
6091 In Stock
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3000 +
£ 0.06
ON Semiconductor
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MJD47G, ON Semiconductor
218 In Stock
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75 +
£ 0.343
DiodesZetex
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ZXTP25020DZTA, DiodesZetex
2050 In Stock
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1000 +
£ 0.039
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PBSS5140U,115, Nexperia
66 In Stock
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25 +
£ 0.072
250 +
£ 0.047
500 +
£ 0.031
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2SD2670TL, ROHM
6092 In Stock
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3000 +
£ 0.115
Semelab
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2N2369ACSM, Semelab
295 In Stock
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100 +
£ 14.27
DiodesZetex
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ZXTP25020DGTA, DiodesZetex
998 In Stock
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1000 +
£ 0.046
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2SCR522MT2L, ROHM
16070 In Stock
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8000 +
£ 0.026
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PBSS4320X,135, Nexperia
8053 In Stock
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4000 +
£ 0.017
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PMBT3904M,315, Nexperia
20065 In Stock
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10000 +
£ 0.006
DiodesZetex
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ZXTN19100CGTA, DiodesZetex
2040 In Stock
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1000 +
£ 0.188
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BFS540,115, NXP
14 In Stock
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£ 0.286
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£ 0.177
200 +
£ 0.134
Fairchild Semiconductor
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BCP53, Fairchild Semiconductor
8085 In Stock
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4000 +
£ 0.092
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BFQ67W,115, NXP
21 In Stock
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£ 0.111
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£ 0.105
200 +
£ 0.099
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BDP948H6327XTSA1, Infineon
58 In Stock
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BCX70KE6327HTSA1, Infineon
6056 In Stock
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3000 +
£ 0.01
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PBSS4350D,115, Nexperia
6059 In Stock
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3000 +
£ 0.052
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PBSS304PX,115, Nexperia
3998 In Stock
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1000 +
£ 0.052
Panasonic
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DSC7102S0L, Panasonic
94 In Stock
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2SAR512RTL, ROHM
6030 In Stock
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3000 +
£ 0.102
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2SCR573D3TL1, ROHM
83 In Stock
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£ 0.236
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£ 0.223
75 +
£ 0.212
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BFT92,215, NXP
25 In Stock
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£ 1.80
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£ 0.27
150 +
£ 0.225
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BCW66KGE6327HTSA1, Infineon
6036 In Stock
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3000 +
£ 0.025
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2N2369ACSM, Semelab

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BD438STU, Fairchild Semiconductor

BD438STU, Fairchild Semiconductor

Power PNP Transistors, Fairchild Semiconductor Bipolar Transistors, Fairchild Semiconductor Bipolar Junction Transistors (BJT) broad range provides complete solutions for various circuit application needs. Innovative packages are designed for minimal size, highest reliability and maximum thermal performance.
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BCX70KE6327HTSA1, Infineon

BCX70KE6327HTSA1, Infineon

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