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. 544-9703
Mfr. Part No.MJ15025G
TWD185.00
Each
units
PNP 16 A 250 V TO-204 Through Hole 250 W 5 Single 400 V 5 V 4 MHz 3 1 -
RS Stock No. 124-1394
Mfr. Part No.KSC1815YTA
TWD0.90
Each (On a Reel of 2000)
units
NPN 150 mA 50 V TO-92 Through Hole 400 mW 25 Single 60 V 5 V 1 MHz 3 1 -
RS Stock No. 484-2577
Mfr. Part No.BSP19,115
BrandNexperia
TWD17.20
Each (In a Pack of 5)
units
NPN 100 mA 350 V SOT-223 (SC-73) Surface Mount 1.2 W 40 Single 400 V 5 V 70 MHz 4 1 -
RS Stock No. 124-1317
Mfr. Part No.2N3904TA
TWD1.00
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
TWD2.00
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
TWD3.30
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. 738-7571
Mfr. Part No.2N2222ACSM
BrandSemelab
TWD477.00
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. 177-5495
Mfr. Part No.2N2222ACSM
BrandSemelab
TWD461.30
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. 739-0442
Mfr. Part No.2N3904TA
TWD4.60
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
TWD1.30
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. 751-4509
Mfr. Part No.MMBT4401-7-F
TWD1.30
Each (On a Tape of 250)
units
NPN 600 mA 40 V SOT-23 Surface Mount 300 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 128-8809
Mfr. Part No.2SAR512P5T100
BrandROHM
TWD6.10
Each (In a Pack of 50)
units
PNP 2 A 30 V SOT-89 Surface Mount 500 mW 200 Common Emitter -30 V -6 V 100 MHz 3+Tab 1 -
RS Stock No. 601-1517
Mfr. Part No.2SC2240-BL(F)
BrandToshiba
TWD8.80
Each (In a Pack of 10)
units
NPN 100 mA 120 V TO-92 Through Hole 300 mW 350 - 120 V 5 V 100 MHz 3 1 -
RS Stock No. 122-0261
Mfr. Part No.MMBT4401-7-F
TWD0.50
Each (On a Reel of 3000)
units
NPN 600 mA 40 V SOT-23 Surface Mount 300 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 166-1534
Mfr. Part No.BSP19,115
BrandNexperia
TWD6.80
Each (On a Reel of 1000)
units
NPN 100 mA 350 V SOT-223 (SC-73) Surface Mount 1.2 W 40 Single 400 V 5 V 70 MHz 4 1 -
RS Stock No. 805-1056
Mfr. Part No.2N3904TFR
TWD2.40
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. 922-7803
Mfr. Part No.FZT951TA
TWD14.70
Each (On a Reel of 1000)
units
PNP 5 A 60 V SOT-223 Surface Mount 3 W 10 Single 100 V 6 V 120 MHz 3 + Tab 1 -
RS Stock No. 145-3286
Mfr. Part No.MMBTA56LT1G
TWD0.70
Each (On a Reel of 3000)
units
PNP 500 mA 80 V SOT-23 Surface Mount 300 mW 100 Single 80 V 4 V 50 MHz 3 1 -
RS Stock No. 169-4145
Mfr. Part No.FZT951TA
TWD33.00
Each
units
PNP 5 A 60 V SOT-223 Surface Mount 3 W 10 Single 100 V 6 V 120 MHz 3 + Tab 1 -
RS Stock No. 145-4783
Mfr. Part No.MMBTA56LT3G
TWD0.70
Each (On a Reel of 10000)
units
PNP 500 mA 80 V SOT-23 Surface Mount 225 mW 100 Single -80 V dc -4 V 100 MHz 3 1 -