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. 921-0849
Mfr. Part No.APT27HZTR-G1
$0.128
Each (In a Pack of 50)
units
NPN - - TO-92 Through Hole 800 mW - Single - - - 3 1 -
RS Stock No. 170-9007
Mfr. Part No.APT27HZTR-G1
$0.109
Each (On a Tape of 2000)
units
NPN - - TO-92 Through Hole 800 mW - Single - - - 3 1 -
RS Stock No. 263-908
Mfr. Part No.ZTX550
$1.122
Each (In a Pack of 5)
units
PNP 1 A 45 V E-Line Through Hole 1 W 15 Single 60 V 5 V 150 MHz 3 1 -
RS Stock No. 922-7683
Mfr. Part No.ZTX550
$0.471
Each (In a Bag of 4000)
units
PNP 1 A 45 V E-Line Through Hole 1 W 15 Single 60 V 5 V 150 MHz 3 1 -
RS Stock No. 121-9987
Mfr. Part No.FZT957TA
$0.763
Each (On a Reel of 1000)
units
PNP 1 A 300 V SOT-223 Surface Mount 3 W 90 Single 300 V 6 V 85 MHz 3 + Tab 1 -
RS Stock No. 669-7593
Mfr. Part No.FZT957TA
$1.362
Each (In a Pack of 5)
units
PNP 1 A 300 V SOT-223 Surface Mount 3 W 90 Single 300 V 6 V 85 MHz 3 + Tab 1 -
RS Stock No. 215-6509
Mfr. Part No.FMMT617TA
$0.672
Each (In a Pack of 5)
units
NPN 3 A 15 V SOT-23 Surface Mount 625 mW - Single 15 V 5 V - 3 1 -
RS Stock No. 922-7816
Mfr. Part No.FMMT617TA
$0.29
Each (On a Reel of 3000)
units
NPN 3 A 15 V SOT-23 Surface Mount 625 mW - Single 15 V 5 V - 3 1 -
RS Stock No. 822-2166
Mfr. Part No.BFS17NTA
$0.254
Each (In a Pack of 20)
units
NPN 50 mA 11 V SOT-23 Surface Mount 350 mW 56 Single 20 V 3 V 3.2 MHz 3 1 -
RS Stock No. 295-501
Mfr. Part No.ZTX651
$1.49
Each (In a Pack of 5)
units
NPN 2 A 60 V E-Line Through Hole 1 W - Single 80 V 5 V 175 MHz 3 1 -
RS Stock No. 274-942
Mfr. Part No.FZT753TA
$1.29
Each
units
PNP 2 A 100 V SOT-223 Surface Mount 2 W 25 Single 120 V 5 V 140 MHz 3 + Tab 1 -
RS Stock No. 121-9419
Mfr. Part No.FZT857TA
$0.754
Each (On a Reel of 1000)
units
NPN 3.5 A 300 V SOT-223 Surface Mount 3 W 15 Single 350 V 6 V 80 MHz 3 + Tab 1 -
RS Stock No. 738-4894
Mfr. Part No.BC807-40-7-F
$0.092
Each (In a Pack of 100)
units
PNP 500 mA 45 V SOT-23 Surface Mount 310 mW 170 Single - -5 V - 3 1 -
RS Stock No. 922-7734
Mfr. Part No.ZTX651
$0.652
Each (In a Box of 4000)
units
NPN 2 A 60 V E-Line Through Hole 1 W - Single 80 V 5 V 175 MHz 3 1 -
RS Stock No. 669-7398
Mfr. Part No.FMMTA42TA
$0.074
Each (In a Pack of 50)
units
NPN 200 mA 300 V SOT-23 Surface Mount 330 mW 25 Single 300 V 5 V 50 MHz 3 1 -
RS Stock No. 922-7715
Mfr. Part No.FZT753TA
$0.483
Each (On a Reel of 1000)
units
PNP 2 A 100 V SOT-223 Surface Mount 2 W 25 Single 120 V 5 V 140 MHz 3 + Tab 1 -
RS Stock No. 669-7357
Mfr. Part No.FZT857TA
$1.434
Each (In a Pack of 5)
units
NPN 3.5 A 300 V SOT-223 Surface Mount 3 W 15 Single 350 V 6 V 80 MHz 3 + Tab 1 -
RS Stock No. 122-1258
Mfr. Part No.ZTX718
$0.518
Each (In a Bag of 4000)
units
PNP 2.5 A 20 V TO-92 Through Hole 1 W 15 Single -20 V -5 V 180 MHz 3 1 -
RS Stock No. 738-4885
Mfr. Part No.BC807-25-7-F
$0.092
Each (In a Pack of 100)
units
PNP 500 mA 45 V SOT-23 Surface Mount 310 mW 100 Single - -5 V - 3 1 -
RS Stock No. 121-9943
Mfr. Part No.FMMT591TA
$0.196
Each (On a Reel of 3000)
units
PNP 1 A 40 V SOT-23 Surface Mount 500 mW 30 Single 40 V 5 V 150 MHz 3 1 -