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. 124-1730
Mfr. Part No.BC547BTA
SGD0.048
Each (On a Reel of 2000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
RS Stock No. 178-7545
Mfr. Part No.2N4403TAR
SGD0.068
Each (In a Bag of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 739-0445
Mfr. Part No.2N4403TA
SGD0.272
Each (In a Pack of 10)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 40 V 5 V - 3 1 -
RS Stock No. 922-7740
Mfr. Part No.ZTX753
SGD0.555
Each (In a Bag of 4000)
units
PNP 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 140 MHz 3 1 -
RS Stock No. 823-1435
Mfr. Part No.LMN200B02-7
SGD0.194
Each (In a Pack of 25)
units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW 250 N+P Loadswitch -50 V -5 V 200 MHz 6 2 -
RS Stock No. 178-4685
Mfr. Part No.2N4403BU
SGD0.056
Each (In a Bag of 10000)
units
- - - - - - - - - - - - - -
RS Stock No. 548-4431
Mfr. Part No.2SC1623-A
SGD0.21
Each
units
NPN 100 mA 50 V MiniMold Surface Mount 200 mW - Single 60 V 5 V 250 MHz 3 1 -
RS Stock No. 145-3904
Mfr. Part No.SMMBT2222ALT1G
SGD0.043
Each (On a Reel of 3000)
units
NPN 600 mA 40 V SOT-23 Surface Mount 225 mW 40 Single 75 V dc 6 V 100 MHz 3 1 AEC-Q101
RS Stock No. 738-7571
Mfr. Part No.2N2222ACSM
BrandSemelab
SGD30.36
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. 896-2625
Mfr. Part No.2SC2712-Y,LF(T
BrandToshiba
SGD0.068
Each (In a Pack of 50)
units
NPN 150 mA 50 V TO-236MOD Surface Mount 150 mW 70 Single 60 V 5 V 80 MHz 3 1 -
RS Stock No. 177-5499
Mfr. Part No.2N2907ACSM
BrandSemelab
SGD18.62
Each (In a Tray of 100)
units
PNP 600 mA 60 V LCC 1 Surface Mount 500 mW 75 Single -60 V -5 V - 3 1 -
RS Stock No. 739-0385
Mfr. Part No.KSP2222ABU
SGD0.305
Each (In a Pack of 10)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 40 Single 75 V 6 V - 3 1 -
RS Stock No. 145-4325
Mfr. Part No.TIP42CTU
SGD0.616
Each (In a Tube of 50)
units
PNP 6 A 100 V TO-220 Through Hole 65 mW 15 Single -100 V -5 V - 3 1 -
RS Stock No. 793-0753
Mfr. Part No.MMBT3904LT3G
SGD0.042
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. 725-8607
Mfr. Part No.MMBT2222A,215
BrandNexperia
SGD0.128
Each (In a Pack of 50)
units
NPN 600 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW 35 Single 75 V 6 V - 3 1 -
RS Stock No. 177-5500
Mfr. Part No.2N2907ADCSM
BrandSemelab
SGD60.732
Each (In a Tray of 100)
units
PNP 600 mA 60 V LCC 2 Surface Mount 350 mW 50 Isolated -60 V -5 V - 6 2 -
RS Stock No. 739-0381
Mfr. Part No.PN2222ATA
SGD0.263
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. 922-7743
Mfr. Part No.ZTX653
SGD0.555
Each (In a Bag of 4000)
units
NPN 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 175 MHz 3 1 -
RS Stock No. 179-1077
Mfr. Part No.MMBT2222A,215
BrandNexperia
SGD0.075
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 756-0192
Mfr. Part No.2SA2056(TE85L,F)
BrandToshiba
SGD0.291
Each (In a Pack of 10)
units
PNP 2 A 50 V TSM Surface Mount 1 W 100 Single -50 V -7 V - 3 1 -
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