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. 803-1087
Mfr. Part No.BC547BTF
€0.064
Each (In a Pack of 200)
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NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS Stock No. 124-1730
Mfr. Part No.BC547BTA
€0.032
Each (On a Reel of 2000)
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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 -
RS Stock No. 169-8610
Mfr. Part No.BC547BTF
€0.032
Each (On a Reel of 2000)
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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
€0.129
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. 124-1315
Mfr. Part No.KSP2222ABU
€0.043
Each (In a Bag of 1000)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 40 Single 75 V 6 V - 3 1 -
RS Stock No. 890-2620
Mfr. Part No.2SA1943N(S1,E,S)
BrandToshiba
€2.28
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3P Through Hole 150 W 35 Single -230 V -5 V - 3 1 -
RS Stock No. 739-0385
Mfr. Part No.KSP2222ABU
€0.077
Each (In a Pack of 10)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 40 Single 75 V 6 V - 3 1 -
RS Stock No. 166-3785
Mfr. Part No.KSC1845FTA
€0.043
Each (On a Tape of 2000)
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NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS Stock No. 169-7397
Mfr. Part No.LMN200B02-7
€0.108
Each (On a Reel of 3000)
units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW 250 N+P Loadswitch -50 V -5 V 200 MHz 6 2 -
RS Stock No. 806-4475
Mfr. Part No.KSC1845FTA
€0.075
Each (In a Pack of 200)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS Stock No. 823-1435
Mfr. Part No.LMN200B02-7
€0.291
Each (In a Pack of 25)
units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW 250 N+P Loadswitch -50 V -5 V 200 MHz 6 2 -
RS Stock No. 761-9828
Mfr. Part No.BC547B
€0.237
Each (In a Pack of 50)
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NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 300 MHz 3 1 -
RS Stock No. 803-1083
Mfr. Part No.BC547BBU
€0.086
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. 166-2988
Mfr. Part No.BC547B
€0.055
Each (In a Bag of 10000)
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NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS Stock No. 842-8015
Mfr. Part No.2N3904BU
€0.032
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. 805-1056
Mfr. Part No.2N3904TFR
€0.086
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. 805-1043
Mfr. Part No.2N3904TAR
€0.054
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. 169-8621
Mfr. Part No.BC559BTA
€0.032
Each (On a Tape of 2000)
units
PNP 100 mA 30 V TO-92 Through Hole 500 mW 110 Single -30 V -5 V 10 MHz 3 1 -
RS Stock No. 843-1575
Mfr. Part No.2N3904BU
€0.119
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. 124-1317
Mfr. Part No.2N3904TA
€0.032
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 -
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