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. 739-0307
Mfr. Part No.SS8050DBU
MYR0.875
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. 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. 125-0066
Mfr. Part No.MJ21193G
MYR21.973
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. 739-0335
Mfr. Part No.SS8050DTA
MYR0.989
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. 168-6056
Mfr. Part No.TIP35C
MYR3.687
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. 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. 166-1318
Mfr. Part No.BCP53-10,115
BrandNexperia
MYR0.335
Each (On a Reel of 1000)
units
PNP 1 A 80 V SOT-223 (SC-73) Surface Mount 1 W 63 Single 100 V 5 V 145 MHz 4 1 -
RS Stock No. 739-0394
Mfr. Part No.2N4401TA
MYR0.998
Each (In a Pack of 10)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V - 3 1 -
RS Stock No. 145-5433
Mfr. Part No.KSA1015YTA
MYR0.121
Each (On a Tape of 2000)
units
PNP 150 mA 50 V TO-92 Through Hole 400 mW 70 Single -50 V -5 V 1 MHz 3 1 -
RS Stock No. 166-2728
Mfr. Part No.2N4401BU
MYR0.135
Each (In a Bag of 10000)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 102-4116
Mfr. Part No.2SD882
MYR1.012
Each (In a Tube of 50)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 739-0439
Mfr. Part No.2N4401BU
MYR1.033
Each (In a Pack of 10)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V - 3 1 -
RS Stock No. 508-412
Mfr. Part No.BCP53-10,115
BrandNexperia
MYR0.723
Each (In a Pack of 50)
units
PNP 1 A 80 V SOT-223 (SC-73) Surface Mount 1 W 63 Single 100 V 5 V 145 MHz 4 1 -
RS Stock No. 686-8045
Mfr. Part No.2SD882
MYR2.606
Each (In a Pack of 10)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 806-4403
Mfr. Part No.KSA1015YTA
MYR0.191
Each (In a Pack of 200)
units
PNP 150 mA 50 V TO-92 Through Hole 400 mW 70 Single -50 V -5 V 1 MHz 3 1 -
RS Stock No. 145-5498
Mfr. Part No.2N4401TAR
MYR0.323
Each (On a Tape of 2000)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 166-3204
Mfr. Part No.2N4401TF
MYR0.135
Each (On a Reel of 2000)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 805-1078
Mfr. Part No.2N4401TF
MYR0.147
Each (In a Pack of 200)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 805-1069
Mfr. Part No.2N4401TAR
MYR0.293
Each (In a Pack of 200)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 760-3117
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
MYR16.11
Each
units
PNP 15 A 230 V TO-3PL Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
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