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. 166-0543
Mfr. Part No.BFS25A,115
BrandNXP
$0.228
Each (On a Reel of 3000)
units
NPN 7 mA 5 V UMT Surface Mount 32 mW 50 Single 8 V 2 V 5000 MHz 3 1 -
RS Stock No. 739-0335
Mfr. Part No.SS8050DTA
$0.277
Each (In a Pack of 10)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS Stock No. 806-2750
Mfr. Part No.KSC3503DSTU
$0.546
Each (In a Tube of 60)
units
NPN 100 mA 300 V TO-126 Through Hole 7 W 40 Single 300 V 5 V 1 MHz 3 1 -
RS Stock No. 125-0067
Mfr. Part No.MJ21194G
$7.74
Each (In a Tray of 100)
units
NPN 16 A 250 V TO-204 Through Hole 250 W 25 Single 400 V 5 V 4 MHz 3 1 -
RS Stock No. 739-0530
Mfr. Part No.TIP42CTU
$0.97
Each (In a Pack of 5)
units
PNP 6 A 100 V TO-220 Through Hole 65 mW 15 Single -100 V -5 V - 3 1 -
RS Stock No. 145-4325
Mfr. Part No.TIP42CTU
$0.333
Each (In a Tube of 50)
units
PNP 6 A 100 V TO-220 Through Hole 65 mW 15 Single -100 V -5 V - 3 1 -
RS Stock No. 545-0236
Mfr. Part No.MJ21194G
$10.34
Each
units
NPN 16 A 250 V TO-204 Through Hole 250 W 25 Single 400 V 5 V 4 MHz 3 1 -
RS Stock No. 544-9680
Mfr. Part No.MJE15030G
$2.20
Each
units
NPN 8 A 150 V TO-220AB Through Hole 50 W 20 Single 150 V 5 V 30 MHz 3 1 -
RS Stock No. 125-0072
Mfr. Part No.MJE15030G
$1.761
Each (In a Tube of 50)
units
NPN 8 A 150 V TO-220AB Through Hole 50 W 20 Single 150 V 5 V 30 MHz 3 1 -
RS Stock No. 671-1113
Mfr. Part No.BC547BTA
$0.207
Each (In a Pack of 25)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
RS Stock No. 485-9777
Mfr. Part No.TIP32C
$0.69
Each (In a Pack of 5)
units
PNP 3 A 100 V TO-220 Through Hole 2 W 10 Single 100 V 5 V - 3 1 -
RS Stock No. 169-8610
Mfr. Part No.BC547BTF
$0.049
Each (On a Reel of 2000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS Stock No. 756-0622
Mfr. Part No.HN4B101J(TE85L,F)
BrandToshiba
$0.374
Each (In a Pack of 10)
units
NPN + PNP 1.2 A 30 V SMV Surface Mount 850 mW 125 Common Emitter -30 V, 50 V 7 (NPN) V, -7 (PNP) V - 5 2 -
RS Stock No. 168-6170
Mfr. Part No.TIP32C
$0.349
Each (In a Tube of 50)
units
PNP 3 A 100 V TO-220 Through Hole 2 W 10 Single 100 V 5 V - 3 1 -
RS Stock No. 803-1087
Mfr. Part No.BC547BTF
$0.076
Each (In a Pack of 200)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS Stock No. 124-1730
Mfr. Part No.BC547BTA
$0.046
Each (On a Reel of 2000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
RS Stock No. 739-0381
Mfr. Part No.PN2222ATA
$0.235
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. 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. 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. 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 -
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