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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Omschrijving Prijs 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-stocknr. 314-1823
FabrikantnummerBD139
€ 0,51
Each
Aantal stuks
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS-stocknr. 168-6075
FabrikantnummerBD139
€ 0,421
Each (In a Tube of 50)
Aantal stuks
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS-stocknr. 103-1438
FabrikantnummerBUTW92
€ 5,222
Each (In a Tube of 30)
Aantal stuks
NPN 60 A 250 V TO-247 Through Hole 180 W 6 Single 500 V 7 V - 3 1 -
RS-stocknr. 686-7985
FabrikantnummerBUTW92
€ 7,62
Each
Aantal stuks
NPN 60 A 250 V TO-247 Through Hole 180 W 6 Single 500 V 7 V - 3 1 -
RS-stocknr. 166-2988
FabrikantnummerBC547B
FabrikantON Semiconductor
€ 0,05
Each (In a Bag of 10000)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS-stocknr. 803-1083
FabrikantnummerBC547BBU
FabrikantON Semiconductor
€ 0,059
Each (In a Pack of 200)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS-stocknr. 761-9828
FabrikantnummerBC547B
FabrikantON Semiconductor
€ 0,235
Each (In a Pack of 50)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 300 MHz 3 1 -
RS-stocknr. 314-1817
FabrikantnummerBD140
€ 1,07
Each
Aantal stuks
PNP 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS-stocknr. 168-6074
FabrikantnummerBD140
€ 0,433
Each (In a Tube of 50)
Aantal stuks
PNP 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS-stocknr. 124-1348
FabrikantnummerBC557BTA
FabrikantON Semiconductor
€ 0,029
Each (On a Reel of 2000)
Aantal stuks
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS-stocknr. 169-8620
FabrikantnummerBC557BTF
FabrikantON Semiconductor
€ 0,039
Each (On a Reel of 2000)
Aantal stuks
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS-stocknr. 903-4077
Fabrikantnummer2SC5200OTU
FabrikantON Semiconductor
€ 2,51
Each (In a Pack of 5)
Aantal stuks
NPN 17 A 250 V TO-264 Through Hole 150 W 55 Single 250 V 5 V 30 MHz 3 1 -
RS-stocknr. 671-1113
FabrikantnummerBC547BTA
FabrikantON Semiconductor
€ 0,194
Each (In a Pack of 25)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
RS-stocknr. 124-1730
FabrikantnummerBC547BTA
FabrikantON Semiconductor
€ 0,029
Each (On a Reel of 2000)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
RS-stocknr. 124-1460
Fabrikantnummer2SC5200OTU
FabrikantON Semiconductor
€ 1,97
Each (In a Tube of 25)
Aantal stuks
NPN 17 A 250 V TO-264 Through Hole 150 W 55 Single 250 V 5 V 30 MHz 3 1 -
RS-stocknr. 761-3505
FabrikantnummerBC557BTA
FabrikantON Semiconductor
€ 0,059
Each (In a Pack of 100)
Aantal stuks
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS-stocknr. 803-1087
FabrikantnummerBC547BTF
FabrikantON Semiconductor
€ 0,064
Each (In a Pack of 200)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS-stocknr. 803-1138
FabrikantnummerBC557BTF
FabrikantON Semiconductor
€ 0,069
Each (In a Pack of 200)
Aantal stuks
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS-stocknr. 169-8610
FabrikantnummerBC547BTF
FabrikantON Semiconductor
€ 0,029
Each (On a Reel of 2000)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS-stocknr. 166-0256
FabrikantnummerPBSS4480X,135
FabrikantNexperia
€ 0,167
Each (On a Reel of 4000)
Aantal stuks
NPN 4 A 80 V UPAK Surface Mount 2.5 W 80 Single 80 V 5 V 150 MHz 4 1 -
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