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. 169-8610
Mfr. Part No.BC547BTF
PHP2.05
Each (On a Reel of 2000)
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. 805-1148
Mfr. Part No.2SA1943OTU
PHP183.23
Each (In a Pack of 5)
units
PNP 17 A 250 V TO-264 Through Hole 150 W 35 Single -250 V -5 V 30 MHz 3 1 -
RS Stock No. 124-1730
Mfr. Part No.BC547BTA
PHP1.68
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. 124-1383
Mfr. Part No.2SA1943OTU
PHP155.40
Each (In a Tube of 25)
units
PNP 17 A 250 V TO-264 Through Hole 150 W 35 Single -250 V -5 V 30 MHz 3 1 -
RS Stock No. 168-6075
Mfr. Part No.BD139
PHP25.88
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. 121-6419
Mfr. Part No.MJL21193G
PHP212.63
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
PHP1.73
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. 803-1134
Mfr. Part No.BC557ATA
PHP3.264
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. 314-1823
Mfr. Part No.BD139
PHP32.13
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
PHP249.90
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. 125-0072
Mfr. Part No.MJE15030G
PHP68.544
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. 544-9680
Mfr. Part No.MJE15030G
PHP78.75
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. 124-5390
Mfr. Part No.NJW0302G
PHP129.654
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. 790-5454
Mfr. Part No.NJW0302G
PHP153.83
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. 100-7577
Mfr. Part No.MJE15035G
PHP59.446
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. 100-7570
Mfr. Part No.MJL4281AG
PHP268.80
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
PHP70.156
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. 463-094
Mfr. Part No.MJL4281AG
PHP311.85
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. 168-6168
Mfr. Part No.TIP3055
PHP43.47
Each (In a Tube of 30)
units
NPN 15 A 60 V TO-247 Through Hole 90 W 5 Single 100 V - 3 MHz 3 1 -
RS Stock No. 124-1314
Mfr. Part No.2N3906BU
PHP2.15
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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