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. 103-2964
Mfr. Part No.2N3055G
R 62.598
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. 545-2210
Mfr. Part No.2N3055G
R 55.99
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. 545-0343
Mfr. Part No.MMBT3904LT1G
R 1.699
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. 170-3540
Mfr. Part No.MMBT3904LT3G
R 0.154
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. 103-2948
Mfr. Part No.MMBT3904LT1G
R 0.362
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. 793-0753
Mfr. Part No.MMBT3904LT3G
R 0.174
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. 296-267
Mfr. Part No.MJ15003G
R 65.12
Each
units
NPN 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
RS stock no. 803-1087
Mfr. Part No.BC547BTF
R 1.101
Each (In a Pack of 200)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS stock no. 671-1113
Mfr. Part No.BC547BTA
R 3.717
Each (In a Pack of 25)
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. 124-1730
Mfr. Part No.BC547BTA
R 0.496
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. 124-1315
Mfr. Part No.KSP2222ABU
R 0.351
Each (In a Bag of 1000)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 40 Single 75 V 6 V - 3 1 -
RS stock no. 739-0385
Mfr. Part No.KSP2222ABU
R 0.537
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. 169-8610
Mfr. Part No.BC547BTF
R 0.54
Each (On a Reel of 2000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS stock no. 124-1317
Mfr. Part No.2N3904TA
R 0.614
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. 805-1043
Mfr. Part No.2N3904TAR
R 1.156
Each (In a Pack of 200)
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. 843-1575
Mfr. Part No.2N3904BU
R 2.687
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. 842-8015
Mfr. Part No.2N3904BU
R 0.638
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. 805-1056
Mfr. Part No.2N3904TFR
R 1.191
Each (In a Pack of 200)
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. 739-0442
Mfr. Part No.2N3904TA
R 3.321
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. 806-2734
Mfr. Part No.KSA1381ESTU
R 5.501
Each (In a Tube of 60)
units
PNP 100 mA 300 V TO-126 Through Hole 7 W 40 Single -300 V -5 V 150 MHz 3 1 -