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. 320-7765
Mfr. Part No.2SA1576A
BrandROHM
SGD0.278
Each (In a Pack of 10)
units
PNP 150 mA 50 V UMT Surface Mount 200 mW - Single 60 V 6 V 140 MHz 3 1 -
RS Stock No. 805-1062
Mfr. Part No.2N3906TF
SGD0.103
Each (In a Pack of 200)
units
PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
RS Stock No. 765-9429
Mfr. Part No.BC33716BU
SGD0.147
Each (In a Pack of 100)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 60 Single - 5 V 100 MHz 3 1 -
RS Stock No. 124-1366
Mfr. Part No.BC33716BU
SGD0.059
Each (In a Bag of 1000)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 60 Single - 5 V 100 MHz 3 1 -
RS Stock No. 816-6779
Mfr. Part No.PHE13005
SGD0.401
Each (In a Pack of 50)
units
NPN 4 A 400 V TO-220AB Through Hole 75 W 10 Single 700 V 9 V 60 Hz 3 1 -
RS Stock No. 122-0070
Mfr. Part No.MJ15004G
SGD5.329
Each (In a Tray of 100)
units
PNP 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
RS Stock No. 296-273
Mfr. Part No.MJ15004G
SGD7.13
Each
units
PNP 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
RS Stock No. 168-3380
Mfr. Part No.DSC300100L
BrandPanasonic
SGD0.068
Each (On a Reel of 10000)
units
NPN 100 mA 50 V SSSMini3 F2 B Surface Mount 100 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 103-1578
Mfr. Part No.BU508AW
SGD2.256
Each (In a Tube of 30)
units
NPN 8 A 700 V TO-247 Through Hole 125 W 5 Single - 9 V - 3 1 -
RS Stock No. 103-2964
Mfr. Part No.2N3055G
SGD4.329
Each (In a Tray of 100)
units
NPN 15 A 60 V TO-204AA Through Hole 115 W 5 Single 100 V 7 V 2.5 MHz 2 1 -
RS Stock No. 545-2210
Mfr. Part No.2N3055G
SGD5.43
Each
units
NPN 15 A 60 V TO-204 Through Hole 115 W 5 Single 100 V 7 V 2.5 MHz 3 1 -
RS Stock No. 774-3571
Mfr. Part No.MJL21194G
SGD8.37
Each
units
NPN 16 A 250 V TO-3BPL Through Hole 200 W 8 Single 400 V 5 V 1 MHz 3 1 -
RS Stock No. 714-6746
Mfr. Part No.BU508AW
SGD3.905
Each (In a Pack of 2)
units
NPN 8 A 700 V TO-247 Through Hole 125 W 5 Single - 9 V - 3 1 -
RS Stock No. 103-5143
Mfr. Part No.MJL21194G
SGD4.011
Each (In a Tube of 25)
units
NPN 16 A 250 V TO-3BPL Through Hole 200 W 8 Single 400 V 5 V 1 MHz 3 1 -
RS Stock No. 698-7105
Mfr. Part No.DSC300100L
BrandPanasonic
SGD0.106
Each (In a Pack of 50)
units
NPN 100 mA 50 V SSSMini3 F2 B Surface Mount 100 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 545-2484
Mfr. Part No.BC560CG
SGD0.322
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. 112-5453
Mfr. Part No.BCP56,115
BrandNexperia
SGD0.164
Each (In a Pack of 5)
units
NPN 1 A 80 V SOT-223 (SC-73) Surface Mount 960 mW 40 Single 100 V 5 V 180 MHz 4 1 -
RS Stock No. 145-2798
Mfr. Part No.BC560CG
SGD0.055
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 -
RS Stock No. 751-4329
Mfr. Part No.DZT5551-13
SGD0.391
Each (In a Pack of 25)
units
NPN 600 mA 160 V SOT-223 Surface Mount 1 W 50 Single 180 V 6 V 300 MHz 3 + Tab 1 -
RS Stock No. 122-0234
Mfr. Part No.DZT5551-13
SGD0.164
Each (On a Reel of 2500)
units
NPN 600 mA 160 V SOT-223 Surface Mount 1 W 50 Single 180 V 6 V 300 MHz 3 + Tab 1 -
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