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
$0.108
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. 799-4817
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
$3.804
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. 761-3701
Mfr. Part No.MPSA42
$0.391
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. 145-5383
Mfr. Part No.PN2222ATA
$0.038
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. 739-0420
Mfr. Part No.FJP13009H2TU
$1.41
Each (In a Pack of 5)
units
NPN 12 A 400 V TO-220 Through Hole 100 W 6 Single 700 V 9 V - 3 1 -
RS Stock No. 890-2682
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
$4.666
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3PL Through Hole 150 W 35 Single 230 V 5 V - 3 1 -
RS Stock No. 296-267
Mfr. Part No.MJ15003G
$10.25
Each
units
NPN 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
RS Stock No. 168-6055
Mfr. Part No.TIP36C
$1.859
Each (In a Tube of 30)
units
PNP 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 166-3611
Mfr. Part No.KSA992FBU
$0.044
Each (In a Bag of 10000)
units
PNP 50 mA 120 V TO-92 Through Hole 500 mW 150 Single -120 V -5 V 1 MHz 3 1 -
RS Stock No. 124-9941
Mfr. Part No.2N5686G
$17.06
Each (In a Tray of 100)
units
NPN 50 A 80 V TO-204 Through Hole 300 mW 5 Single 80 V 5 V - 2 1 -
RS Stock No. 251-3558
Mfr. Part No.TIP36C
$2.95
Each (In a Pack of 5)
units
PNP 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 168-6167
Mfr. Part No.TIP29C
$0.449
Each (In a Tube of 50)
units
NPN 1 A 100 V TO-220 Through Hole 2 W 15 Single 100 V 5 V - 3 1 -
RS Stock No. 862-4893
Mfr. Part No.2N5686G
$21.98
Each
units
NPN 50 A 80 V TO-204 Through Hole 300 mW 5 Single 80 V 5 V - 2 1 -
RS Stock No. 806-4447
Mfr. Part No.KSA992FBU
$0.097
Each (In a Pack of 200)
units
PNP 50 mA 120 V TO-92 Through Hole 500 mW 150 Single -120 V -5 V 1 MHz 3 1 -
RS Stock No. 485-9711
Mfr. Part No.TIP29C
$0.856
Each (In a Pack of 5)
units
NPN 1 A 100 V TO-220 Through Hole 2 W 15 Single 100 V 5 V - 3 1 -
RS Stock No. 163-0837
Mfr. Part No.2N5038G
$10.16
Each (In a Tray of 100)
units
NPN 20 A 90 V TO-204AA Through Hole 140 W 20 Single 150 V 7 V 5 MHz 2 1 -
RS Stock No. 545-2484
Mfr. Part No.BC560CG
$0.423
Each (In a Pack of 50)
units
PNP 100 mA 45 V TO-92 Through Hole 625 mW 100 Single 50 V 5 V 250 MHz 3 1 -
RS Stock No. 170-3540
Mfr. Part No.MMBT3904LT3G
$0.02
Each (On a Reel of 10000)
units
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW 30 Single 60 V dc 6 V 100 MHz 3 1 -
RS Stock No. 545-0343
Mfr. Part No.MMBT3904LT1G
$0.17
Each (In a Pack of 50)
units
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW 40 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 145-2798
Mfr. Part No.BC560CG
$0.053
Each (In a Bag of 5000)
units
PNP 100 mA 45 V TO-92 Through Hole 625 mW 100 Single 50 V 5 V 250 MHz 3 1 -
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