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 madeA 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 transistorTransistors 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. 803-1140
Mfr. Part No.BC559BTA
€0.054
Each (In a Pack of 200)
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. 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. 314-1823
Mfr. Part No.BD139
€2.22
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. 124-1348
Mfr. Part No.BC557BTA
€0.03
Each (On a Reel of 2000)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS Stock No. 169-8620
Mfr. Part No.BC557BTF
€0.032
Each (On a Reel 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. 124-1727
Mfr. Part No.BC32725TA
€0.038
Each (On a Reel of 2000)
units
PNP 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -
RS Stock No. 168-6075
Mfr. Part No.BD139
€0.455
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. 761-3505
Mfr. Part No.BC557BTA
€0.054
Each (In a Pack of 100)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS Stock No. 803-1138
Mfr. Part No.BC557BTF
€0.065
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. 671-1103
Mfr. Part No.BC32725TA
€0.22
Each (In a Pack of 10)
units
PNP 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -
RS Stock No. 146-2074
Mfr. Part No.PN2222ABU
€0.032
Each (In a Bag of 10000)
units
NPN 1 A 40 V TO-92 Through Hole 625 mW 35 Single 75 V 6 V 300 MHz 3 1 -
RS Stock No. 146-2333
Mfr. Part No.BC548B A1
€0.039
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 200 Single 30 V 6 V - 3 1 -
RS Stock No. 739-0555
Mfr. Part No.PN2222ABU
€0.038
Each (In a Pack of 10)
units
NPN 1 A 40 V TO-92 Through Hole 625 mW 35 Single 75 V 6 V 300 MHz 3 1 -
RS Stock No. 170-4158
Mfr. Part No.BC547C A1
€0.037
Each (On a Tape of 4000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 420 Single 50 V 6 V - 3 1 -
RS Stock No. 145-5383
Mfr. Part No.PN2222ATA
€0.032
Each (On a Tape of 2000)
units
NPN 1 A 40 V TO-92 Through Hole 625 mW 35 Single 75 V 6 V 300 MHz 3 1 -
RS Stock No. 739-0381
Mfr. Part No.PN2222ATA
€0.232
Each (In a Pack of 10)
units
NPN 1 A 40 V TO-92 Through Hole 625 mW 35 Single 75 V 6 V 300 MHz 3 1 -
RS Stock No. 796-9701
Mfr. Part No.BC547C A1
€0.13
Each (In a Pack of 250)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 420 Single 50 V 6 V - 3 1 -
RS Stock No. 796-9713
Mfr. Part No.BC548B A1
€0.043
Each (In a Pack of 250)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 200 Single 30 V 6 V - 3 1 -
RS Stock No. 805-1065
Mfr. Part No.2N3906TFR
€0.065
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. 739-0375
Mfr. Part No.2N3906BU
€0.13
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 -
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