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. 145-5556
Mfr. Part No.BC546BTA
SGD0.061
Each (On a Tape of 2000)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 110 Single 80 V 6 V 300 MHz 3 1 -
RS Stock No. 761-9825
Mfr. Part No.BC546BTA
SGD0.109
Each (In a Pack of 100)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 110 Single 80 V 6 V 300 MHz 3 1 -
RS Stock No. 166-3114
Mfr. Part No.BC546BTF
SGD0.057
Each (On a Reel of 2000)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 110 Single 80 V 6 V 1 MHz 3 1 -
RS Stock No. 803-1077
Mfr. Part No.BC546BTF
SGD0.112
Each (In a Pack of 200)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 110 Single 80 V 6 V 1 MHz 3 1 -
RS Stock No. 166-1431
Mfr. Part No.BCM857BS,115
BrandNexperia
SGD0.157
Each (On a Reel of 3000)
units
PNP 100 mA 45 V UMT Surface Mount 300 mW 200 Isolated 50 V 5 V 175 MHz 6 2 -
RS Stock No. 170-8022
Mfr. Part No.BCM857BS,135
BrandNexperia
SGD0.137
Each (On a Reel of 10000)
units
PNP 100 mA -45 V SOT-363 Surface Mount 200 mW 200 Current Mirror -50 V -5 V 175 MHz 6 2 AEC-Q101
RS Stock No. 509-706
Mfr. Part No.BCM857BS,115
BrandNexperia
SGD0.419
Each (In a Pack of 20)
units
PNP 100 mA 45 V UMT Surface Mount 300 mW 200 Isolated 50 V 5 V 175 MHz 6 2 -
RS Stock No. 296-267
Mfr. Part No.MJ15003G
SGD10.74
Each
units
NPN 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
RS Stock No. 805-1043
Mfr. Part No.2N3904TAR
SGD0.096
Each (In a Pack of 200)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 124-1317
Mfr. Part No.2N3904TA
SGD0.05
Each (On a Reel of 2000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 805-1056
Mfr. Part No.2N3904TFR
SGD0.096
Each (In a Pack of 200)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 739-0442
Mfr. Part No.2N3904TA
SGD0.221
Each (In a Pack of 10)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 842-8015
Mfr. Part No.2N3904BU
SGD0.058
Each (In a Bag of 1000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 843-1575
Mfr. Part No.2N3904BU
SGD0.207
Each (In a Pack of 50)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 169-8696
Mfr. Part No.2N3906TAR
SGD0.051
Each (On a Reel of 2000)
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. 320-7765
Mfr. Part No.2SA1576A
BrandROHM
SGD0.076
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. 739-0375
Mfr. Part No.2N3906BU
SGD0.232
Each (In a Pack of 10)
units
PNP 200 mA 40 V TO-92 Through Hole 625 mW 30 Single -40 V -5 V - 3 1 -
RS Stock No. 805-1065
Mfr. Part No.2N3906TFR
SGD0.096
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. 177-7978
Mfr. Part No.2SA1576A
BrandROHM
SGD0.057
Each (On a Reel of 3000)
units
PNP 150 mA 50 V UMT Surface Mount 200 mW - Single 60 V 6 V 140 MHz 3 1 -
RS Stock No. 124-1314
Mfr. Part No.2N3906BU
SGD0.065
Each (In a Bag of 1000)
units
PNP 200 mA 40 V TO-92 Through Hole 625 mW 30 Single -40 V -5 V - 3 1 -
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