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. 912-8116
Mfr. Part No.SSM2212RZ
$7.277
Each (In a Tube of 98)
units
NPN 20 mA 10 V SOIC Surface Mount - 200 Isolated 15 V - 10 kHz 8 2 -
RS Stock No. 802-3679
Mfr. Part No.SSM2212RZ
$10.08
Each
units
NPN 20 mA 10 V SOIC Surface Mount - 200 Isolated 15 V - 10 kHz 8 2 -
RS Stock No. 802-3666
Mfr. Part No.MAT12AHZ
$41.67
Each
units
NPN 20 mA 10 V TO-78 Through Hole - 200 Isolated 15 V - 200 MHz 6 2 -
RS Stock No. 160-0658
Mfr. Part No.MAT12AHZ
$43.371
Each (In a Box of 100)
units
NPN 20 mA 10 V TO-78 Through Hole - 200 Isolated 15 V - 200 MHz 6 2 -
RS Stock No. 709-8518
Mfr. Part No.MAT01AHZ
$33.52
Each
units
NPN 25 mA 45 V TO-78 Through Hole 500 mW 500 Isolated 45 V - 450 MHz 6 2 -
RS Stock No. 159-8033
Mfr. Part No.MAT01AHZ
$34.882
Each (In a Box of 100)
units
NPN 25 mA 45 V TO-78 Through Hole 500 mW 500 Isolated 45 V - 450 MHz 6 2 -
RS Stock No. 709-8512
Mfr. Part No.MAT01GHZ
$23.23
Each
units
NPN 25 mA 45 V TO-78 Through Hole 500 mW 250 Isolated - - 450 MHz 6 2 -
RS Stock No. 912-9563
Mfr. Part No.MAT01GHZ
$19.719
Each (In a Box of 100)
units
NPN 25 mA 45 V TO-78 Through Hole 500 mW 250 Isolated - - 450 MHz 6 2 -
RS Stock No. 160-0656
Mfr. Part No.MAT14ARZ
$12.524
Each (In a Tube of 56)
units
NPN 30 mA 40 V SOIC Surface Mount - 200 Isolated 40 V - 1 kHz 14 4 -
RS Stock No. 802-3660
Mfr. Part No.MAT14ARZ
$15.36
Each
units
NPN 30 mA 40 V SOIC Surface Mount - 200 Isolated 40 V - 1 kHz 14 4 -