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. 739-0381
Mfr. Part No.PN2222ATA
$0.259
Each (In a Pack of 10)
units
NPN 1 A 40 V TO-92 Through Hole 625 mW 35 Single 75 V 6 V 300 MHz 3 1 -
RS Stock No. 145-5383
Mfr. Part No.PN2222ATA
$0.039
Each (On a Tape of 2000)
units
NPN 1 A 40 V TO-92 Through Hole 625 mW 35 Single 75 V 6 V 300 MHz 3 1 -
RS Stock No. 805-1043
Mfr. Part No.2N3904TAR
$0.116
Each (In a Pack of 200)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 805-1056
Mfr. Part No.2N3904TFR
$0.12
Each (In a Pack of 200)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 124-1317
Mfr. Part No.2N3904TA
$0.053
Each (On a Reel of 2000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 166-3044
Mfr. Part No.FJB3307DTM
$0.951
Each (On a Reel of 800)
units
NPN 8 A 400 V D2PAK (TO-263) Surface Mount 80 W 8 Single 700 V 9 V 1 MHz 3 1 -
RS Stock No. 843-1575
Mfr. Part No.2N3904BU
$0.122
Each (In a Pack of 50)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 772-9244
Mfr. Part No.FJB3307DTM
$0.70
Each (In a Pack of 10)
units
NPN 8 A 400 V D2PAK (TO-263) Surface Mount 80 W 8 Single 700 V 9 V 1 MHz 3 1 -
RS Stock No. 739-0442
Mfr. Part No.2N3904TA
$0.34
Each (In a Pack of 10)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 842-8015
Mfr. Part No.2N3904BU
$0.082
Each (In a Bag of 1000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 544-9618
Mfr. Part No.MJE15031G
$2.64
Each
units
PNP 8 A 150 V TO-220AB Through Hole 50 W 20 Single 150 V 5 V 30 MHz 3 1 -
RS Stock No. 103-2936
Mfr. Part No.MJE15031G
$1.386
Each (In a Tube of 50)
units
PNP 8 A 150 V TO-220AB Through Hole 50 W 20 Single 150 V 5 V 30 MHz 3 1 -
RS Stock No. 739-0401
Mfr. Part No.FJA13009TU
$2.774
Each (In a Pack of 5)
units
NPN 12 A 400 V TO-3P Through Hole 130 W 6 Single 700 V 9 V - 3 1 -
RS Stock No. 124-1316
Mfr. Part No.FJA13009TU
$1.364
Each (In a Tube of 30)
units
NPN 12 A 400 V TO-3P Through Hole 130 W 6 Single 700 V 9 V - 3 1 -
RS Stock No. 803-1128
Mfr. Part No.BC556ABU
$0.109
Each (In a Pack of 200)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 MHz 3 1 -
RS Stock No. 169-8618
Mfr. Part No.BC556ABU
$0.051
Each (In a Bag of 1000)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 MHz 3 1 -
RS Stock No. 805-1113
Mfr. Part No.2N5551TF
$0.129
Each (In a Pack of 200)
units
NPN 600 mA 160 V TO-92 Through Hole 625 mW 80 Single 180 V 6 V 100 MHz 3 1 -
RS Stock No. 805-1104
Mfr. Part No.2N5551TA
$0.096
Each (In a Pack of 200)
units
NPN 600 mA 160 V TO-92 Through Hole 625 mW 80 Single 180 V 6 V 100 MHz 3 1 -
RS Stock No. 761-3701
Mfr. Part No.MPSA42
$0.409
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. 166-3205
Mfr. Part No.2N5551TA
$0.047
Each (On a Tape of 2000)
units
NPN 600 mA 160 V TO-92 Through Hole 625 mW 80 Single 180 V 6 V 100 MHz 3 1 -