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. 146-2074
Mfr. Part No.PN2222ABU
MYR0.151
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. 739-0555
Mfr. Part No.PN2222ABU
MYR0.785
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. 796-9717
Mfr. Part No.BC548C A1
MYR0.262
Each (In a Pack of 250)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 420 Single 30 V 6 V - 3 1 -
RS Stock No. 170-4162
Mfr. Part No.BC548C A1
MYR0.117
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 420 Single 30 V 6 V - 3 1 -
RS Stock No. 738-7571
Mfr. Part No.2N2222ACSM
BrandSemelab
MYR62.12
Each
units
NPN 800 mA 40 V LCC 1 Surface Mount 500 mW 50 Single 75 V 6 V 250 MHz 3 1 -
RS Stock No. 793-0753
Mfr. Part No.MMBT3904LT3G
MYR0.135
Each (In a Pack of 200)
units
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW 30 Single 60 V dc 6 V 100 MHz 3 1 -
RS Stock No. 177-5495
Mfr. Part No.2N2222ACSM
BrandSemelab
MYR61.00
Each (In a Tray of 100)
units
NPN 800 mA 40 V LCC 1 Surface Mount 500 mW 50 Single 75 V 6 V 250 MHz 3 1 -
RS Stock No. 545-0343
Mfr. Part No.MMBT3904LT1G
MYR0.446
Each (In a Pack of 50)
units
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW 40 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 103-2948
Mfr. Part No.MMBT3904LT1G
MYR0.078
Each (On a Reel of 3000)
units
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW 40 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 170-3540
Mfr. Part No.MMBT3904LT3G
MYR0.059
Each (On a Reel of 10000)
units
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW 30 Single 60 V dc 6 V 100 MHz 3 1 -
RS Stock No. 806-2775
Mfr. Part No.KSD880YTU
MYR1.597
Each (In a Tube of 50)
units
NPN 3 A 60 V TO-220 Through Hole 30 W 20 Single 60 V 60 V 1 MHz 3 1 -
RS Stock No. 545-2210
Mfr. Part No.2N3055G
MYR20.06
Each
units
NPN 15 A 60 V TO-204 Through Hole 115 W 5 Single 100 V 7 V 2.5 MHz 3 1 -
RS Stock No. 103-2964
Mfr. Part No.2N3055G
MYR14.862
Each (In a Tray of 100)
units
NPN 15 A 60 V TO-204AA Through Hole 115 W 5 Single 100 V 7 V 2.5 MHz 2 1 -
RS Stock No. 739-0442
Mfr. Part No.2N3904TA
MYR0.56
Each (In a Pack of 10)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 842-8015
Mfr. Part No.2N3904BU
MYR0.134
Each (In a Bag of 1000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 843-1575
Mfr. Part No.2N3904BU
MYR0.425
Each (In a Pack of 50)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 805-1084
Mfr. Part No.2N4403TFR
MYR0.251
Each (In a Pack of 200)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single -40 V -5 V 200 MHz 3 1 -
RS Stock No. 124-1317
Mfr. Part No.2N3904TA
MYR0.131
Each (On a Reel of 2000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 178-7546
Mfr. Part No.2N4403TFR
MYR0.188
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 805-1071
Mfr. Part No.2N4403BU
MYR0.274
Each (In a Pack of 200)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single -40 V -5 V 200 MHz 3 1 -
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