BJT & Bipolar Transistors

A Bipolar Transistor or BJT (Bipolar Junction Transistor) is a solid state, three-pin device made from three layers of silicon. A BJT is designed to amplify current, bipolar transistors can also function as a switch. There are two main types of transistor, PNP (positive negative positive) or NPN (negative positive negative).
How a Bipolar transistor is made
A bipolar transistor is made by joining two signal diodes back to back creating two PN junctions connected in series, sharing a common P or N terminal. By nature, silicon does not normally conduct electricity well. However, when silicon is treated with certain chemicals or impurities we can make the material and electrons behave in a different way. This process is called doping. The doping process improves the semiconductors ability to conduct electricity.
What does a bipolar transistor do?
As we said before a bipolar transistor has two possible functions, switching, and amplification. Due to the devices three layers of doped semiconductor material, supplying the transistor with a signal voltage enables the discrete component to act as an insulator or a conductor. This clever change provides the transistors with two basic functions, switching (digital) electronics or amplification (analog) electronics.
Types of transistor
Transistors are available in panel, surface and through hole mounting options in plastic package or metal can versions. All have three terminals or pins, the Base, the Collector, and the Emitter.
Where are bipolar transistors used?
Transistors are one of the most widely used discrete components in electronic designs and circuits. Transistors are used for the amplification of all types of electrical signals in circuits made up of individual components rather than ICs (integrated circuits).

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Description Price Transistor Type Maximum DC Collector Current Maximum Collector Emitter Voltage Package Type Mounting Type Maximum Power Dissipation Minimum DC Current Gain Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Automotive Standard
RS Stock No. 124-1357
Mfr. Part No.MPSA42
HK$0.757
Each (In a Bag of 1000)
units
NPN 500 mA 300 V TO-92 Through Hole 625 mW 25 Single 300 V 6 V 50 MHz 3 1 -
RS Stock No. 761-3701
Mfr. Part No.MPSA42
HK$2.071
Each (In a Pack of 50)
units
NPN 500 mA 300 V TO-92 Through Hole 625 mW 25 Single 300 V 6 V 50 MHz 3 1 -
RS Stock No. 761-3505
Mfr. Part No.BC557BTA
HK$0.477
Each (In a Pack of 100)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS Stock No. 166-2167
Mfr. Part No.KSC5027OTU
HK$4.787
Each (In a Tube of 50)
units
NPN 3 A 800 V TO-220 Through Hole 50 W 8 Single 1100 V 7 V 1 MHz 3 1 -
RS Stock No. 738-7571
Mfr. Part No.2N2222ACSM
BrandSemelab
HK$205.69
Each
units
NPN 800 mA 40 V LCC 1 Surface Mount 500 mW 50 Single 75 V 6 V 250 MHz 3 1 -
RS Stock No. 169-8696
Mfr. Part No.2N3906TAR
HK$0.228
Each (On a Reel of 2000)
units
PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
RS Stock No. 169-8620
Mfr. Part No.BC557BTF
HK$0.238
Each (On a Reel of 2000)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS Stock No. 124-1348
Mfr. Part No.BC557BTA
HK$0.303
Each (On a Reel of 2000)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS Stock No. 739-0375
Mfr. Part No.2N3906BU
HK$1.22
Each (In a Pack of 10)
units
PNP 200 mA 40 V TO-92 Through Hole 625 mW 30 Single -40 V -5 V - 3 1 -
RS Stock No. 124-1314
Mfr. Part No.2N3906BU
HK$0.323
Each (In a Bag of 1000)
units
PNP 200 mA 40 V TO-92 Through Hole 625 mW 30 Single -40 V -5 V - 3 1 -
RS Stock No. 671-1116
Mfr. Part No.BC33725TA
HK$1.486
Each (In a Pack of 10)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -
RS Stock No. 803-1138
Mfr. Part No.BC557BTF
HK$0.446
Each (In a Pack of 200)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS Stock No. 177-5495
Mfr. Part No.2N2222ACSM
BrandSemelab
HK$144.182
Each (In a Tray of 100)
units
NPN 800 mA 40 V LCC 1 Surface Mount 500 mW 50 Single 75 V 6 V 250 MHz 3 1 -
RS Stock No. 806-4504
Mfr. Part No.KSC5027OTU
HK$7.027
Each (In a Pack of 10)
units
NPN 3 A 800 V TO-220 Through Hole 50 W 8 Single 1100 V 7 V 1 MHz 3 1 -
RS Stock No. 803-1068
Mfr. Part No.BC33725TAR
HK$0.727
Each (In a Pack of 200)
units
NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
RS Stock No. 169-8605
Mfr. Part No.BC33725TFR
HK$0.333
Each (On a Reel of 2000)
units
NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
RS Stock No. 805-1062
Mfr. Part No.2N3906TF
HK$0.404
Each (In a Pack of 200)
units
PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
RS Stock No. 805-1065
Mfr. Part No.2N3906TFR
HK$0.734
Each (In a Pack of 200)
units
PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
RS Stock No. 124-1731
Mfr. Part No.BC33725TA
HK$0.329
Each (On a Reel of 2000)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -
RS Stock No. 805-1059
Mfr. Part No.2N3906TA
HK$0.73
Each (In a Pack of 200)
units
PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -