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. 295-539
Mfr. Part No.ZTX753
$1.36
Each (In a Pack of 5)
units
PNP 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 140 MHz 3 1 -
RS Stock No. 922-7740
Mfr. Part No.ZTX753
$0.622
Each (In a Bag of 4000)
units
PNP 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 140 MHz 3 1 -
RS Stock No. 774-3678
Mfr. Part No.TIP30CG
$0.799
Each (In a Pack of 10)
units
PNP 1 A 100 V TO-220AB Through Hole 30 W 15 Single 100 V 5 V 1 MHz 3 1 -
RS Stock No. 806-4475
Mfr. Part No.KSC1845FTA
$0.134
Each (In a Pack of 200)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS Stock No. 166-3785
Mfr. Part No.KSC1845FTA
$0.06
Each (On a Tape of 2000)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS Stock No. 168-6075
Mfr. Part No.BD139
$0.791
Each (In a Tube of 50)
units
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS Stock No. 485-9812
Mfr. Part No.TIP41C
$1.008
Each (In a Pack of 5)
units
NPN 6 A 100 V TO-220 Through Hole 65 W 15 Single 100 V 5 V - 3 1 -
RS Stock No. 314-1823
Mfr. Part No.BD139
$0.96
Each
units
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS Stock No. 168-6171
Mfr. Part No.TIP41C
$0.849
Each (In a Tube of 50)
units
NPN 6 A 100 V TO-220 Through Hole 65 W 15 Single 100 V 5 V - 3 1 -
RS Stock No. 806-2750
Mfr. Part No.KSC3503DSTU
$0.418
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. 626-2793
Mfr. Part No.BFS25A,115
BrandNXP
$0.215
Each (In a Pack of 10)
units
NPN 7 mA 5 V UMT Surface Mount 32 mW 50 Single 8 V 2 V 5000 MHz 3 1 -
RS Stock No. 892-2254
Mfr. Part No.BFR340FH6327XTSA1
BrandInfineon
$0.417
Each (In a Pack of 50)
units
NPN 20 mA 6 V TSFP Surface Mount 75 mW 90 Single 15 V 2 V 14 GHz 3 - -
RS Stock No. 166-2584
Mfr. Part No.SS8050DBU
$0.055
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. 739-0307
Mfr. Part No.SS8050DBU
$0.355
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. 739-0335
Mfr. Part No.SS8050DTA
$0.316
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. 165-8250
Mfr. Part No.BFR340FH6327XTSA1
BrandInfineon
$0.129
Each (On a Reel of 3000)
units
NPN 20 mA 6 V TSFP Surface Mount 75 mW 90 Single 15 V 2 V 14 GHz 3 - -
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. 145-5537
Mfr. Part No.SS8050DTA
$0.059
Each (On a Tape of 2000)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS Stock No. 125-0067
Mfr. Part No.MJ21194G
$7.06
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. 545-0236
Mfr. Part No.MJ21194G
$12.11
Each
units
NPN 16 A 250 V TO-204 Through Hole 250 W 25 Single 400 V 5 V 4 MHz 3 1 -
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