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. 739-0445
Mfr. Part No.2N4403TA
MYR0.81
Each (In a Pack of 10)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 40 V 5 V - 3 1 -
RS Stock No. 805-1075
Mfr. Part No.2N4403TAR
MYR0.344
Each (In a Pack of 200)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single -40 V -5 V 200 MHz 3 1 -
RS Stock No. 805-1084
Mfr. Part No.2N4403TFR
MYR0.251
Each (In a Pack of 200)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single -40 V -5 V 200 MHz 3 1 -
RS Stock No. 178-4685
Mfr. Part No.2N4403BU
MYR0.123
Each (In a Bag of 10000)
units
- - - - - - - - - - - - - -
RS Stock No. 178-7545
Mfr. Part No.2N4403TAR
MYR0.184
Each (In a Bag of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 122-0087
Mfr. Part No.MJ15024G
MYR20.061
Each (In a Tray of 100)
units
NPN 16 A 250 V TO-204 Through Hole 250 W 5 Single 400 V 5 V 4 MHz 3 1 -
RS Stock No. 544-9646
Mfr. Part No.MJ15024G
MYR27.04
Each
units
NPN 16 A 250 V TO-204 Through Hole 250 W 5 Single 400 V 5 V 4 MHz 3 1 -
RS Stock No. 805-1043
Mfr. Part No.2N3904TAR
MYR0.233
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. 463-616
Mfr. Part No.BC817-16LT1G
MYR0.18
Each (In a Pack of 200)
units
NPN 500 mA 45 V SOT-23 Surface Mount 300 mW 40 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 922-7743
Mfr. Part No.ZTX653
MYR1.51
Each (In a Bag of 4000)
units
NPN 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 175 MHz 3 1 -
RS Stock No. 102-1352
Mfr. Part No.BC817-16LT1G
MYR0.09
Each (On a Reel of 3000)
units
NPN 500 mA 45 V SOT-23 Surface Mount 300 mW 40 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 295-517
Mfr. Part No.ZTX653
MYR3.17
Each (In a Pack of 5)
units
NPN 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 175 MHz 3 1 -
RS Stock No. 799-4817
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
MYR8.106
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3PL Through Hole 150 W 35 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 862-4979
Mfr. Part No.MJ21193G
MYR26.67
Each (In a Pack of 2)
units
PNP 16 A 250 V TO-204AA Through Hole 250 W 8 Single -400 V -5 V - 2 1 -
RS Stock No. 125-0066
Mfr. Part No.MJ21193G
MYR20.49
Each (In a Tray of 100)
units
PNP 16 A 250 V TO-204AA Through Hole 250 W 8 Single -400 V -5 V - 2 1 -
RS Stock No. 184-868
Mfr. Part No.2SC5198-O(Q)
BrandToshiba
MYR12.65
Each
units
NPN 10 A 140 V TO-3PN Through Hole 100 W 80 Single 140 V 5 V 30 MHz 3 1 -
RS Stock No. 251-3564
Mfr. Part No.TIP35C
MYR7.40
Each
units
NPN 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 166-2584
Mfr. Part No.SS8050DBU
MYR0.159
Each (In a Bag of 10000)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS Stock No. 168-6056
Mfr. Part No.TIP35C
MYR4.24
Each (In a Tube of 30)
units
NPN 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 296-267
Mfr. Part No.MJ15003G
MYR25.13
Each
units
NPN 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
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