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. 890-2682
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
PHP118.992
Each (In a Pack of 5)
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NPN 15 A 230 V TO-3PL Through Hole 150 W 35 Single 230 V 5 V - 3 1 -
RS Stock No. 799-4817
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
PHP110.884
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3PL Through Hole 150 W 35 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 760-3117
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
PHP156.46
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units
PNP 15 A 230 V TO-3PL Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 168-7405
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
PHP105.23
Each (In a Tube of 100)
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PNP 15 A 230 V TO-3PL Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 903-4077
Mfr. Part No.2SC5200OTU
PHP165.912
Each (In a Pack of 5)
units
NPN 17 A 250 V TO-264 Through Hole 150 W 55 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 124-1460
Mfr. Part No.2SC5200OTU
PHP109.809
Each (In a Tube of 25)
units
NPN 17 A 250 V TO-264 Through Hole 150 W 55 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 124-1317
Mfr. Part No.2N3904TA
PHP1.68
Each (On a Reel of 2000)
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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
PHP1.244
Each (In a Bag of 1000)
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NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 739-0442
Mfr. Part No.2N3904TA
PHP7.182
Each (In a Pack of 10)
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NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 843-1575
Mfr. Part No.2N3904BU
PHP5.056
Each (In a Pack of 50)
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NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 805-1043
Mfr. Part No.2N3904TAR
PHP2.443
Each (In a Pack of 200)
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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
PHP2.297
Each (In a Pack of 200)
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NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 761-3701
Mfr. Part No.MPSA42
PHP12.867
Each (In a Pack of 50)
units
NPN 500 mA 300 V TO-92 Through Hole 625 mW 25 Single 300 V 6 V 50 MHz 3 1 -
RS Stock No. 124-1357
Mfr. Part No.MPSA42
PHP3.389
Each (In a Bag of 1000)
units
NPN 500 mA 300 V TO-92 Through Hole 625 mW 25 Single 300 V 6 V 50 MHz 3 1 -
RS Stock No. 896-2653
Mfr. Part No.TTA1943(Q)
BrandToshiba
PHP89.825
Each (In a Pack of 2)
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PNP 15 A 230 V 2-21F1A Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 170-4160
Mfr. Part No.BC547B A1
PHP1.147
Each (On a Tape of 4000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V - 3 1 -
RS Stock No. 796-9707
Mfr. Part No.BC547B A1
PHP1.927
Each (In a Pack of 250)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V - 3 1 -
RS Stock No. 601-1719
Mfr. Part No.2SC5359-O(Q)
BrandToshiba
PHP128.458
Each (In a Pack of 5)
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NPN 15 A 230 V TO-3PL Through Hole 180 W 80 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 169-8610
Mfr. Part No.BC547BTF
PHP1.463
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. 671-1113
Mfr. Part No.BC547BTA
PHP7.40
Each (In a Pack of 25)
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NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
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