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. 518-1700
FabrikantnummerPBSS4480X,135
FabrikantNexperia
€ 0,42
Each (In a Pack of 10)
Aantal stuks
NPN 4 A 80 V UPAK Surface Mount 2.5 W 80 Single 80 V 5 V 150 MHz 4 1 -
RS-stocknr. 166-0256
FabrikantnummerPBSS4480X,135
FabrikantNexperia
€ 0,172
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 -
RS-stocknr. 170-4162
FabrikantnummerBC548C A1
€ 0,032
Each (On a Tape of 4000)
Aantal stuks
NPN 100 mA 30 V TO-92 Through Hole 500 mW 420 Single 30 V 6 V - 3 1 -
RS-stocknr. 168-6056
FabrikantnummerTIP35C
€ 1,477
Each (In a Tube of 30)
Aantal stuks
NPN 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS-stocknr. 251-3558
FabrikantnummerTIP36C
€ 1,80
Each (In a Pack of 5)
Aantal stuks
PNP 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS-stocknr. 796-9713
FabrikantnummerBC548B A1
€ 0,13
Each (In a Pack of 250)
Aantal stuks
NPN 100 mA 30 V TO-92 Through Hole 500 mW 200 Single 30 V 6 V - 3 1 -
RS-stocknr. 251-3564
FabrikantnummerTIP35C
€ 2,22
Each
Aantal stuks
NPN 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS-stocknr. 146-2333
FabrikantnummerBC548B A1
€ 0,04
Each (On a Tape of 4000)
Aantal stuks
NPN 100 mA 30 V TO-92 Through Hole 500 mW 200 Single 30 V 6 V - 3 1 -
RS-stocknr. 168-6055
FabrikantnummerTIP36C
€ 1,509
Each (In a Tube of 30)
Aantal stuks
PNP 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS-stocknr. 739-0442
Fabrikantnummer2N3904TA
FabrikantON Semiconductor
€ 0,231
Each (In a Pack of 10)
Aantal stuks
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS-stocknr. 805-1056
Fabrikantnummer2N3904TFR
FabrikantON Semiconductor
€ 0,086
Each (In a Pack of 200)
Aantal stuks
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS-stocknr. 843-1575
Fabrikantnummer2N3904BU
FabrikantON Semiconductor
€ 0,119
Each (In a Pack of 50)
Aantal stuks
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS-stocknr. 124-1317
Fabrikantnummer2N3904TA
FabrikantON Semiconductor
€ 0,032
Each (On a Reel of 2000)
Aantal stuks
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS-stocknr. 842-8015
Fabrikantnummer2N3904BU
FabrikantON Semiconductor
€ 0,032
Each (In a Bag of 1000)
Aantal stuks
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS-stocknr. 805-1043
Fabrikantnummer2N3904TAR
FabrikantON Semiconductor
€ 0,054
Each (In a Pack of 200)
Aantal stuks
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS-stocknr. 145-4325
FabrikantnummerTIP42CTU
FabrikantON Semiconductor
€ 0,496
Each (In a Tube of 50)
Aantal stuks
PNP 6 A 100 V TO-220 Through Hole 65 mW 15 Single -100 V -5 V - 3 1 -
RS-stocknr. 739-0530
FabrikantnummerTIP42CTU
FabrikantON Semiconductor
€ 0,602
Each (In a Pack of 5)
Aantal stuks
PNP 6 A 100 V TO-220 Through Hole 65 mW 15 Single -100 V -5 V - 3 1 -
RS-stocknr. 122-0088
FabrikantnummerMJ15022G
FabrikantON Semiconductor
€ 5,131
Each (In a Tray of 100)
Aantal stuks
NPN 16 A 200 V TO-204 Through Hole 250 W 5 Single 350 V 5 V 4 MHz 3 1 -
RS-stocknr. 544-9696
FabrikantnummerMJ15022G
FabrikantON Semiconductor
€ 6,85
Each
Aantal stuks
NPN 16 A 200 V TO-204 Through Hole 250 W 5 Single 350 V 5 V 4 MHz 3 1 -
RS-stocknr. 163-0961
FabrikantnummerMJE243G
FabrikantON Semiconductor
€ 0,248
Each (In a Box of 500)
Aantal stuks
NPN 4 A 100 V TO-225 Through Hole 15 W 15 Single 100 V 7 V 10 MHz 3 1 -
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