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. 545-0343
Mfr. Part No.MMBT3904LT1G
TWD4
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
TWD1
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
TWD0
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. 793-0753
Mfr. Part No.MMBT3904LT3G
TWD1
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. 166-3111
Mfr. Part No.BC549BTF
TWD1
Each (On a Reel of 2000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 5 V 1 MHz 3 1 -
RS Stock No. 169-8613
Mfr. Part No.BC549BTA
TWD1
Each (On a Tape of 2000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 5 V 1 MHz 3 1 -
RS Stock No. 739-0350
Mfr. Part No.MMBT2222A
TWD6
Each (In a Pack of 10)
units
NPN 1 A 40 V SOT-23 Surface Mount 350 mW 35 Single 75 V 6 V 300 MHz 3 1 -
RS Stock No. 803-1119
Mfr. Part No.BC549BTF
TWD1
Each (In a Pack of 200)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 5 V 1 MHz 3 1 -
RS Stock No. 803-1100
Mfr. Part No.BC549BTA
TWD2
Each (In a Pack of 200)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 5 V 1 MHz 3 1 -
RS Stock No. 145-4769
Mfr. Part No.15C01M-TL-E
TWD2
Each (On a Reel of 3000)
units
NPN 700 mA 15 V MCP Surface Mount 300 mW 300 Single 20 V 5 V 330 MHz 3 1 -
RS Stock No. 739-0303
Mfr. Part No.MMBT3904
TWD6
Each (In a Pack of 10)
units
NPN 200 mA 40 V SOT-23 Surface Mount 350 mW 30 Single 60 V 6 V - 3 1 -
RS Stock No. 792-4956
Mfr. Part No.15C01M-TL-E
TWD7
Each (In a Pack of 50)
units
NPN 700 mA 15 V MCP Surface Mount 300 mW 300 Single 20 V 5 V 330 MHz 3 1 -
RS Stock No. 102-4116
Mfr. Part No.2SD882
TWD7
Each (In a Tube of 50)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 922-7800
Mfr. Part No.FZT851TA
TWD12
Each (On a Reel of 1000)
units
NPN 6 A 60 V SOT-223 Surface Mount 3 W - Single 150 V 6 V - 3 + Tab 1 -
RS Stock No. 686-8045
Mfr. Part No.2SD882
TWD17
Each (In a Pack of 10)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 826-8342
Mfr. Part No.2SA2094TLQ
BrandROHM
TWD9
Each (In a Pack of 30)
units
PNP 2 A 60 V SOT-346T (SC-96) Surface Mount 500 mW 120 Single -60 V -6 V 100 MHz 3 1 -
RS Stock No. 169-4139
Mfr. Part No.FZT851TA
TWD57
Each
units
NPN 6 A 60 V SOT-223 Surface Mount 3 W - Single 150 V 6 V - 3 + Tab 1 -
RS Stock No. 738-4891
Mfr. Part No.BC817-40-7-F
TWD2
Each (In a Pack of 100)
units
NPN 500 mA 45 V SOT-23 Surface Mount 310 mW 170 Single - 5 V - 3 1 -
RS Stock No. 166-3634
Mfr. Part No.SS9014ABU
TWD1
Each (In a Bag of 1000)
units
NPN 100 mA 45 V TO-92 Through Hole 450 mW 60 Single 50 V 5 V 1 MHz 3 1 -
RS Stock No. 165-8768
Mfr. Part No.BC56PA
BrandNexperia
TWD4
Each (On a Reel of 3000)
units
NPN 1 A 80 V SOT-1061 Surface Mount 1.65 W 40 Single 100 V 5 V 100 MHz 3 1 -