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
$0.109
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. 177-7977
Mfr. Part No.2SA1037AKT146Q/R
BrandROHM
$0.047
Each (On a Reel of 3000)
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
$0.204
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. 177-7989
Mfr. Part No.2SC4082T106/P
BrandROHM
$0.132
Each (On a Reel of 3000)
units
NPN 50 mA 20 V UMT Surface Mount 200 mW 82 Single 30 V 3 V 1500 MHz 3 1 -
RS Stock No. 124-6436
Mfr. Part No.2SAR542PT100
BrandROHM
$0.741
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. 320-7743
Mfr. Part No.2SA1514KT146R/S
BrandROHM
$0.527
Each (In a Pack of 10)
units
PNP 50 mA 120 V SOT-346 (SC-59) Surface Mount 200 mW 180 Single -120 V -5 V 140 MHz 3 1 -
RS Stock No. 826-8471
Mfr. Part No.2SD2391T100Q
BrandROHM
$0.793
Each (In a Pack of 20)
units
NPN 2 A 60 V SC-62 Surface Mount 2 W 120 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 128-8837
Mfr. Part No.2SCR544P5T100
BrandROHM
$0.428
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. 177-7978
Mfr. Part No.2SA1576A
BrandROHM
$0.051
Each (On a Reel of 3000)
units
PNP 150 mA 50 V UMT Surface Mount 200 mW - Single 60 V 6 V 140 MHz 3 1 -
RS Stock No. 320-7765
Mfr. Part No.2SA1576A
BrandROHM
$0.314
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. 124-6433
Mfr. Part No.2SA1576AT106Q
BrandROHM
$0.071
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. 128-8835
Mfr. Part No.2SCR542PT100
BrandROHM
$0.626
Each (In a Pack of 25)
units
NPN 5 A 30 V SOT-89 Surface Mount 500 mW 200 Common Emitter 30 V 6 V 100 MHz 3+Tab 1 -
RS Stock No. 128-8806
Mfr. Part No.2SA2071P5T100Q
BrandROHM
$0.403
Each (In a Pack of 25)
units
PNP 3 A 60 V SOT-89 Surface Mount 500 mW 120 Common Emitter -60 V -6 V 10 MHz 3+Tab 1 -
RS Stock No. 168-2137
Mfr. Part No.DTA124EETL
BrandROHM
$0.276
Each (In a Pack of 200)
units
PNP 100 mA - SOT-416 Surface Mount 150 mW 56 Single - - 250 MHz 3 1 -
RS Stock No. 168-1896
Mfr. Part No.DTC114YUAT106
BrandROHM
$0.063
Each (In a Pack of 200)
units
NPN 100 mA - SOT-323 Surface Mount 200 mW 68 Single - - 250 MHz 3 1 -
RS Stock No. 128-8824
Mfr. Part No.2SC5663T2L
BrandROHM
$0.205
Each (In a Pack of 50)
units
NPN 500 mA 12 V SOT-723 Surface Mount 150 mW 270 Common Emitter 15 V 6 V 100 MHz 3 1 -
RS Stock No. 826-8336
Mfr. Part No.2SA2071T100Q
BrandROHM
$0.73
Each (In a Pack of 20)
units
PNP 3 A 60 V SC-62 Surface Mount 2 W 120 Single -60 V -6 V 10 MHz 3 1 -
RS Stock No. 168-2051
Mfr. Part No.DTA144EUAT106
BrandROHM
$0.079
Each (In a Pack of 200)
units
PNP 100 mA - SOT-323 Surface Mount 200 mW 68 Single - - 250 MHz 3 1 -
RS Stock No. 826-8554
Mfr. Part No.IMZ1AT108
BrandROHM
$0.30
Each (In a Pack of 60)
units
NPN + PNP 150 mA 50 V SC-74 Surface Mount 300 mW 120 Isolated -60 V, 60 V -6 (PNP) V, 7 (NPN) V 100 MHz 6 2 -
RS Stock No. 128-8840
Mfr. Part No.2SCR553P5T100
BrandROHM
$0.318
Each (In a Pack of 25)
units
NPN 2 A 50 V SOT-89 Surface Mount 500 mW 180 Common Emitter 50 V 6 V 100 MHz 3+Tab 1 -