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. 103-5143
Mfr. Part No.MJL21194G
$6.83
Each (In a Tube of 25)
units
NPN 16 A 250 V TO-3BPL Through Hole 200 W 8 Single 400 V 5 V 1 MHz 3 1 -
RS Stock No. 671-1116
Mfr. Part No.BC33725TA
$0.346
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. 124-9936
Mfr. Part No.2N3055AG
$6.66
Each (In a Tray of 100)
units
NPN 15 A 60 V TO-204 Through Hole 115 W 5 Single 100 V 7 V 1 MHz 2 1 -
RS Stock No. 169-8605
Mfr. Part No.BC33725TFR
$0.081
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. 803-1061
Mfr. Part No.BC33725TFR
$0.149
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. 816-7744
Mfr. Part No.BC860CW
BrandNexperia
$0.057
Each (In a Pack of 200)
units
PNP 100 mA 45 V SOT-323 (SC-70) Surface Mount 200 mW 420 Single -50 V -5 V 100 MHz 3 1 -
RS Stock No. 146-0892
Mfr. Part No.BC860CW
BrandNexperia
$0.034
Each (On a Reel of 3000)
units
PNP 100 mA 45 V SOT-323 (SC-70) Surface Mount 200 mW 420 Single -50 V -5 V 100 MHz 3 1 -
RS Stock No. 806-2734
Mfr. Part No.KSA1381ESTU
$0.593
Each (In a Tube of 60)
units
PNP 100 mA 300 V TO-126 Through Hole 7 W 40 Single -300 V -5 V 150 MHz 3 1 -
RS Stock No. 774-3212
Mfr. Part No.2N3055AG
$9.95
Each
units
NPN 15 A 60 V TO-204AA Through Hole 115 W 5 Single 100 V 7 V 1 MHz 2 1 -
RS Stock No. 124-1731
Mfr. Part No.BC33725TA
$0.075
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. 168-6174
Mfr. Part No.BD237
$1.137
Each (In a Tube of 50)
units
NPN 2 A 80 V SOT-32 Through Hole 25 W 25 Single 80 V 5 V 3 MHz 3 1 -
RS Stock No. 124-9938
Mfr. Part No.2N3771G
$7.37
Each (In a Tray of 100)
units
NPN 30 A 40 V TO-204AA Through Hole 150 W 5 Single 50 V 5 V 50 kHz 2 1 -
RS Stock No. 184-874
Mfr. Part No.2SC5242-O(Q)
BrandToshiba
$4.56
Each
units
NPN 15 A 230 V TO-3PN Through Hole 130 W 80 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 803-1068
Mfr. Part No.BC33725TAR
$0.122
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. 178-7544
Mfr. Part No.BC33725TAR
$0.058
Each (In a Bag of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 739-0303
Mfr. Part No.MMBT3904
$0.261
Each (In a Pack of 10)
units
NPN 200 mA 40 V SOT-23 Surface Mount 350 mW 30 Single 60 V 6 V - 3 1 -
RS Stock No. 774-3224
Mfr. Part No.2N3771G
$11.04
Each
units
NPN 30 A 40 V TO-204AA Through Hole 150 W 5 Single 50 V 5 V 50 kHz 2 1 -
RS Stock No. 485-9979
Mfr. Part No.BD237
$1.33
Each (In a Pack of 5)
units
NPN 2 A 80 V SOT-32 Through Hole 25 W 25 Single 80 V 5 V 3 MHz 3 1 -
RS Stock No. 165-5559
Mfr. Part No.BFP196WH6327XTSA1
BrandInfineon
$0.117
Each (On a Reel of 3000)
units
NPN 150 mA 12 V SOT-343 Surface Mount 700 mW 70 Single 20 V 2 V 7.5 GHz 4 - -
RS Stock No. 166-2959
Mfr. Part No.2N5551BU
$0.061
Each (In a Bag of 10000)
units
NPN 600 mA 160 V TO-92 Through Hole 625 mW 80 Single 180 V 6 V 100 MHz 3 1 -
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