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. 808-0458
Mfr. Part No.SS8050CTA
MYR0.319
Each (In a Pack of 100)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V 1 MHz 3 1 -
RS Stock No. 842-7936
Mfr. Part No.NSM4002MR6T1G
MYR0.536
Each (In a Pack of 100)
units
NPN 500 mA 40 V, 45 V SC-74 Surface Mount 260 mW 100 Complex 40 V, 45 V 5 V, 6 V 300 (Min.) MHz 6 2 -
RS Stock No. 805-1113
Mfr. Part No.2N5551TF
MYR0.302
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. 669-7445
Mfr. Part No.ZDT6790TA
MYR4.58
Each (In a Pack of 5)
units
NPN + PNP 2 A 40 V, 45 V SM Surface Mount 2.75 W 150 Isolated 45 V 5 V 150 MHz 8 2 -
RS Stock No. 124-1728
Mfr. Part No.BC32740TA
MYR0.188
Each (On a Reel of 2000)
units
PNP 800 mA 45 V TO-92 Through Hole 625 mW 170 Single - 5 V 100 MHz 3 1 -
RS Stock No. 545-0438
Mfr. Part No.MMBTA42LT1G
MYR0.667
Each (In a Pack of 50)
units
NPN 500 mA 300 V SOT-23 Surface Mount 300 mW 25 Single 300 V 6 V 50 MHz 3 1 -
RS Stock No. 177-5497
Mfr. Part No.2N2222ADCSM
BrandSemelab
MYR153.465
Each (In a Tray of 100)
units
NPN 800 mA 50 V LCC 2 Surface Mount 500 mW 50 Isolated 75 V 6 V 250 MHz 6 2 -
RS Stock No. 805-1104
Mfr. Part No.2N5551TA
MYR0.327
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. 170-4161
Mfr. Part No.BC548A A1
MYR0.145
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 6 V - 3 1 -
RS Stock No. 124-1460
Mfr. Part No.2SC5200OTU
MYR11.00
Each (In a Tube of 25)
units
NPN 17 A 250 V TO-264 Through Hole 150 W 55 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 166-3664
Mfr. Part No.SS8050CTA
MYR0.172
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 1 MHz 3 1 -
RS Stock No. 166-3205
Mfr. Part No.2N5551TA
MYR0.176
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 -
RS Stock No. 166-3209
Mfr. Part No.2N5551TF
MYR0.164
Each (On a Reel of 2000)
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. 145-4546
Mfr. Part No.KSB772YSTU
MYR1.591
Each (In a Tube of 60)
units
PNP 3 A 30 V TO-126 Through Hole 10 W 30 Single -40 V -5 V 80 MHz 3 1 -
RS Stock No. 166-0863
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
MYR0.31
Each (On a Reel of 3000)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW 70 Single 20 V 2.5 V 5000 MHz 3 1 -
RS Stock No. 890-2645
Mfr. Part No.2SC3324-BL(TE85L,F
BrandToshiba
MYR0.468
Each (In a Pack of 25)
units
NPN 100 mA 120 V SOT-346 (SC-59) Surface Mount 150 mW 200 Single 120 V 120 V - 3 1 -
RS Stock No. 739-0423
Mfr. Part No.KSB772YSTU
MYR1.84
Each (In a Pack of 5)
units
PNP 3 A 30 V TO-126 Through Hole 10 W 30 Single -40 V -5 V 80 MHz 3 1 -
RS Stock No. 601-1135
Mfr. Part No.2SA1162-GR(F)
BrandToshiba
MYR0.207
Each (In a Pack of 10)
units
PNP 150 mA 50 V SOT-346 (SC-59) Surface Mount 150 mW 200 Single 50 V 5 V 80 MHz 3 1 -
RS Stock No. 295-539
Mfr. Part No.ZTX753
MYR3.48
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. 168-6165
Mfr. Part No.TIP2955
MYR6.977
Each (In a Tube of 30)
units
PNP 15 A 60 V TO-247 Through Hole 90 W 5 Single 100 V - 3 MHz 3 1 -