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. 124-1730
Mfr. Part No.BC547BTA
PHP1.492
Each (On a Reel of 2000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
RS Stock No. 803-1087
Mfr. Part No.BC547BTF
PHP3.518
Each (In a Pack of 200)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS Stock No. 671-1113
Mfr. Part No.BC547BTA
PHP6.676
Each (In a Pack of 25)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
RS Stock No. 168-6075
Mfr. Part No.BD139
PHP22.904
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. 803-1134
Mfr. Part No.BC557ATA
PHP2.969
Each (In a Pack of 200)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS Stock No. 121-6419
Mfr. Part No.MJL21193G
PHP192.576
Each (In a Tube of 25)
units
PNP 16 A 250 V TO-264 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
RS Stock No. 169-8619
Mfr. Part No.BC557ATA
PHP1.784
Each (On a Tape of 2000)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS Stock No. 314-1823
Mfr. Part No.BD139
PHP29.04
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. 790-5404
Mfr. Part No.MJL21193G
PHP230.88
Each
units
PNP 16 A 250 V TO-264 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
RS Stock No. 544-9680
Mfr. Part No.MJE15030G
PHP71.32
Each
units
NPN 8 A 150 V TO-220AB Through Hole 50 W 20 Single 150 V 5 V 30 MHz 3 1 -
RS Stock No. 125-0072
Mfr. Part No.MJE15030G
PHP60.711
Each (In a Tube of 50)
units
NPN 8 A 150 V TO-220AB Through Hole 50 W 20 Single 150 V 5 V 30 MHz 3 1 -
RS Stock No. 790-5454
Mfr. Part No.NJW0302G
PHP131.77
Each (In a Pack of 2)
units
PNP 15 A 250 V TO-3P Through Hole 150 W 75 Single 250 V dc 5 V 1 MHz 3 1 -
RS Stock No. 124-5390
Mfr. Part No.NJW0302G
PHP107.986
Each (In a Tube of 30)
units
PNP 15 A 250 V TO-3P Through Hole 150 W 75 Single 250 V dc 5 V 1 MHz 3 1 -
RS Stock No. 100-7570
Mfr. Part No.MJL4281AG
PHP243.701
Each (In a Tube of 25)
units
NPN 15 A 350 V TO-3PBL Through Hole 230 W 10 Single 350 V 5 V 35 MHz 3 1 -
RS Stock No. 463-177
Mfr. Part No.MJE15035G
PHP62.77
Each (In a Pack of 5)
units
PNP 4 A 350 V TO-220AB Through Hole 50 W 10 Single 350 V 5 V 30 MHz 3 1 -
RS Stock No. 100-7577
Mfr. Part No.MJE15035G
PHP53.304
Each (In a Tube of 50)
units
PNP 4 A 350 V TO-220AB Through Hole 50 W 10 Single 350 V 5 V 30 MHz 3 1 -
RS Stock No. 463-094
Mfr. Part No.MJL4281AG
PHP285.72
Each
units
NPN 15 A 350 V TO-3PBL Through Hole 230 W 10 Single 350 V 5 V 35 MHz 3 1 -
RS Stock No. 739-0375
Mfr. Part No.2N3906BU
PHP7.134
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. 122-0089
Mfr. Part No.MJ15025G
PHP227.62
Each (In a Tray of 100)
units
PNP 16 A 250 V TO-204 Through Hole 250 W 5 Single 400 V 5 V 4 MHz 3 1 -
RS Stock No. 544-9703
Mfr. Part No.MJ15025G
PHP321.39
Each
units
PNP 16 A 250 V TO-204 Through Hole 250 W 5 Single 400 V 5 V 4 MHz 3 1 -
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