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. 709-8518
FabrikantnummerMAT01AHZ
FabrikantAnalog Devices
21,34 €
Each
Aantal stuks
NPN 25 mA 45 V TO-78 Through Hole 500 mW 500 Isolated 45 V - 450 MHz 6 2 -
RS-stocknr. 802-3660
FabrikantnummerMAT14ARZ
FabrikantAnalog Devices
11,22 €
Each
Aantal stuks
NPN 30 mA 40 V SOIC Surface Mount - 200 Isolated 40 V - 1 kHz 14 4 -
RS-stocknr. 912-9563
FabrikantnummerMAT01GHZ
FabrikantAnalog Devices
12,945 €
Each (In a Box of 100)
Aantal stuks
NPN 25 mA 45 V TO-78 Through Hole 500 mW 250 Isolated - - 450 MHz 6 2 -
RS-stocknr. 159-8033
FabrikantnummerMAT01AHZ
FabrikantAnalog Devices
18,50 €
Each (In a Box of 100)
Aantal stuks
NPN 25 mA 45 V TO-78 Through Hole 500 mW 500 Isolated 45 V - 450 MHz 6 2 -
RS-stocknr. 802-3679
FabrikantnummerSSM2212RZ
FabrikantAnalog Devices
6,48 €
Each
Aantal stuks
NPN 20 mA 10 V SOIC Surface Mount - 200 Isolated 15 V - 10 kHz 8 2 -
RS-stocknr. 160-0658
FabrikantnummerMAT12AHZ
FabrikantAnalog Devices
23,00 €
Each (In a Box of 100)
Aantal stuks
NPN 20 mA 10 V TO-78 Through Hole - 200 Isolated 15 V - 200 MHz 6 2 -
RS-stocknr. 709-8512
FabrikantnummerMAT01GHZ
FabrikantAnalog Devices
15,73 €
Each
Aantal stuks
NPN 25 mA 45 V TO-78 Through Hole 500 mW 250 Isolated - - 450 MHz 6 2 -
RS-stocknr. 802-3666
FabrikantnummerMAT12AHZ
FabrikantAnalog Devices
25,34 €
Each
Aantal stuks
NPN 20 mA 10 V TO-78 Through Hole - 200 Isolated 15 V - 200 MHz 6 2 -
RS-stocknr. 160-0656
FabrikantnummerMAT14ARZ
FabrikantAnalog Devices
7,281 €
Each (In a Tube of 56)
Aantal stuks
NPN 30 mA 40 V SOIC Surface Mount - 200 Isolated 40 V - 1 kHz 14 4 -
RS-stocknr. 912-8116
FabrikantnummerSSM2212RZ
FabrikantAnalog Devices
4,608 €
Each (In a Tube of 98)
Aantal stuks
NPN 20 mA 10 V SOIC Surface Mount - 200 Isolated 15 V - 10 kHz 8 2 -