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. 320-7737
Mfr. Part No.2SA1037AKT146Q/R
BrandROHM
$0.111
Each (In a Pack of 10)
units
PNP 150 mA 50 V SOT-346 (SC-59) Surface Mount 200 mW 120 Single -60 V -6 V 140 MHz 3 1 -
RS Stock No. 320-8235
Mfr. Part No.2SC4082T106/P
BrandROHM
$0.505
Each (In a Pack of 10)
units
NPN 50 mA 20 V UMT Surface Mount 200 mW 82 Single 30 V 3 V 1500 MHz 3 1 -
RS Stock No. 128-8837
Mfr. Part No.2SCR544P5T100
BrandROHM
$0.736
Each (In a Pack of 25)
units
NPN 2.5 A 80 V SOT-89 Surface Mount 500 mW 120 Common Emitter 80 V 6 V 100 MHz 3+Tab 1 -
RS Stock No. 124-6433
Mfr. Part No.2SA1576AT106Q
BrandROHM
$0.16
Each (In a Pack of 150)
units
PNP 150 mA 50 V SOT-323 (SC-70) Surface Mount 200 mW 120 Single -60 V -6 V 140 MHz 3 1 -
RS Stock No. 124-6436
Mfr. Part No.2SAR542PT100
BrandROHM
$0.834
Each (In a Pack of 15)
units
PNP 5 A 30 V SOT-89 Surface Mount 2 W 200 Single -30 V -6 V 240 MHz 3 + Tab 1 -
RS Stock No. 320-7765
Mfr. Part No.2SA1576A
BrandROHM
$0.089
Each (In a Pack of 10)
units
PNP 150 mA 50 V UMT Surface Mount 200 mW - Single 60 V 6 V 140 MHz 3 1 -
RS Stock No. 128-8808
Mfr. Part No.2SAR502EBTL
BrandROHM
$0.126
Each (In a Pack of 200)
units
PNP 500 mA 30 V SOT-416FL Surface Mount 150 mW 200 Common Emitter -30 V -6 V 100 MHz 3 1 -
RS Stock No. 128-8810
Mfr. Part No.2SAR513P5T100
BrandROHM
$0.539
Each (In a Pack of 50)
units
PNP 1 A 50 V SOT-89 Surface Mount 500 mW 180 Common Emitter -50 V -6 V 100 MHz 3+Tab 1 -
RS Stock No. 128-8825
Mfr. Part No.2SCR293P5T100
BrandROHM
$0.561
Each (In a Pack of 50)
units
NPN 1 A 30 V SOT-89 Surface Mount 500 mW 270 Common Emitter 30 V 6 V 100 MHz 3+Tab 1 -
RS Stock No. 168-2085
Mfr. Part No.DTC143ZEBTL
BrandROHM
$0.105
Each (In a Pack of 200)
units
NPN 100 mA - SOT-416FL Surface Mount 150 mW 80 Single - - 250 MHz 3 1 -
RS Stock No. 128-8813
Mfr. Part No.2SAR523MT2L
BrandROHM
$0.145
Each (In a Pack of 200)
units
PNP 100 mA 50 V SOT-723 Surface Mount 150 mW 120 Common Emitter -50 V -5 V 100 MHz 3 1 -
RS Stock No. 124-6439
Mfr. Part No.2SC4617TLQ
BrandROHM
$0.14
Each (In a Pack of 150)
units
NPN 150 mA 50 V SOT-416 (SC-75A) Surface Mount 150 mW 120 Single 60 V 7 V 180 MHz 3 1 -
RS Stock No. 171-5374
Mfr. Part No.2SAR572D3TL1
BrandROHM
$1.133
Each (On a Reel of 50)
units
PNP 5 A -30 (Minimum) V TO-252 Surface Mount 10 W 200 Single -30 (Minimum) V -6 (Minimum) V 300 MHz 3 1 -
RS Stock No. 128-8826
Mfr. Part No.2SCR372P5T100
BrandROHM
$0.514
Each (In a Pack of 25)
units
NPN 700 mA 120 V SOT-89 Surface Mount 500 mW 120 Common Emitter 120 V 6 V 100 MHz 3+Tab 1 -
RS Stock No. 146-7234
Mfr. Part No.2SB1706TL
BrandROHM
$0.706
Each (In a Pack of 50)
units
PNP 2 A 30 V SOT-346T (SC-96) Surface Mount 500 mW 270 Single -30 V -6 V 280 MHz 3 1 -
RS Stock No. 171-5403
Mfr. Part No.EMD53T2R
BrandROHM
$0.096
Each (On a Reel of 8000)
units
NPN + PNP 100 (NPN) mA, 100 (PNP) mA - SOT-563 Surface Mount 150 mW 35 - - - 250 MHz 6 2 -
RS Stock No. 320-7973
Mfr. Part No.2SB1197KT146Q/R
BrandROHM
$0.222
Each (In a Pack of 25)
units
PNP 800 mA 32 V SOT-346 (SC-59) Surface Mount 200 mW 120 Single -40 V -5 V 200 MHz 3 1 -
RS Stock No. 826-8456
Mfr. Part No.2SD1898T100R
BrandROHM
$0.611
Each (In a Pack of 25)
units
NPN 1 A 80 V SC-62 Surface Mount 2 W 120 Single 120 V 5 V 100 MHz 3 1 -
RS Stock No. 826-8437
Mfr. Part No.2SD1484KT146R
BrandROHM
$0.404
Each (In a Pack of 60)
units
NPN 500 mA 50 V SOT-346 Surface Mount 200 mW 120 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 826-8383
Mfr. Part No.2SB1708TL
BrandROHM
$0.999
Each (In a Pack of 20)
units
PNP 3 A 30 V TSMT Surface Mount 500 mW 270 Single -30 V -6 V 100 MHz 3 1 -