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. 756-0192
Mfr. Part No.2SA2056(TE85L,F)
BrandToshiba
SGD0.291
Each (In a Pack of 10)
units
PNP 2 A 50 V TSM Surface Mount 1 W 100 Single -50 V -7 V - 3 1 -
RS Stock No. 896-2625
Mfr. Part No.2SC2712-Y,LF(T
BrandToshiba
SGD0.068
Each (In a Pack of 50)
units
NPN 150 mA 50 V TO-236MOD Surface Mount 150 mW 70 Single 60 V 5 V 80 MHz 3 1 -
RS Stock No. 799-4753
Mfr. Part No.2SA1943N(S1,E,S)
BrandToshiba
SGD3.616
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3PN Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 890-2620
Mfr. Part No.2SA1943N(S1,E,S)
BrandToshiba
SGD2.848
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3P Through Hole 150 W 35 Single -230 V -5 V - 3 1 -
RS Stock No. 756-0293
Mfr. Part No.2SC5886A(T6L1,NQ)
BrandToshiba
SGD0.776
Each (In a Pack of 5)
units
NPN 5 A 50 V DPAK (TO-252) Surface Mount 20 W 200 Single 120 V 9 V - 3 1 -
RS Stock No. 601-1157
Mfr. Part No.2SA1162-Y(TE85L,F)
BrandToshiba
SGD0.089
Each (On a Reel of 3000)
units
PNP 150 mA 50 V SOT-346 (SC-59) Surface Mount 150 mW 120 Single 50 V 5 V 80 MHz 3 1 -
RS Stock No. 168-7405
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
SGD3.214
Each (In a Tube of 100)
units
PNP 15 A 230 V TO-3PL Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 760-3117
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
SGD4.94
Each
units
PNP 15 A 230 V TO-3PL Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 756-0240
Mfr. Part No.2SC3303-Y(T6L1,NQ)
BrandToshiba
SGD0.888
Each (In a Pack of 5)
units
NPN 5 A 80 V DPAK (TO-252) Surface Mount 20 W 120 Single 100 V 7 V 120 MHz 3 1 -
RS Stock No. 531-9523
Mfr. Part No.2SC4116-Y(F)
BrandToshiba
SGD0.127
Each (In a Pack of 10)
units
NPN 150 mA 50 V USM Surface Mount 100 mW 120 Single 60 V 5 V 80 MHz 3 1 -
RS Stock No. 890-2626
Mfr. Part No.2SA1721-O(TE85L,F)
BrandToshiba
SGD0.608
Each (In a Pack of 25)
units
PNP 100 mA 300 V SOT-346 (SC-59) Surface Mount 150 mW 30 Single -300 V -5 V - 3 1 -
RS Stock No. 184-868
Mfr. Part No.2SC5198-O(Q)
BrandToshiba
SGD5.25
Each
units
NPN 10 A 140 V TO-3PN Through Hole 100 W 80 Single 140 V 5 V 30 MHz 3 1 -
RS Stock No. 756-0578
Mfr. Part No.HN1B01F-GR(TE85L,F
BrandToshiba
SGD0.183
Each (In a Pack of 10)
units
NPN + PNP 150 mA 50 V SM Surface Mount 300 mW 200 Isolated -50 V, 60 V 5 (NPN) V, -5 (PNP) V 120 (PNP) MHz, 150 (NPN) MHz 6 2 -
RS Stock No. 756-3860
Mfr. Part No.TPCP8505(TE85L,F)
BrandToshiba
SGD0.323
Each (In a Pack of 10)
units
NPN 3 A 50 V PS Surface Mount 3 W 200 Single 100 V 7 V - 8 1 -
RS Stock No. 601-1703
Mfr. Part No.2SC5358-O(Q)
BrandToshiba
SGD2.518
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3PN Through Hole 150 W 80 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 756-0265
Mfr. Part No.2SC5200-R(Q)
BrandToshiba
SGD2.46
Each
units
NPN 15 A 230 V TO-3PL Through Hole 150 W 55 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 756-0219
Mfr. Part No.2SA2097(TE16L1,NQ)
BrandToshiba
SGD0.578
Each (In a Pack of 5)
units
PNP 5 A 50 V DPAK (TO-252) Surface Mount 20 W 100 Single -50 V -7 V - 3 1 -
RS Stock No. 601-1270
Mfr. Part No.2SA1987-O(Q)
BrandToshiba
SGD3.12
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3PL Through Hole 180 W 80 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 890-2682
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
SGD4.468
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3PL Through Hole 150 W 35 Single 230 V 5 V - 3 1 -
RS Stock No. 756-0215
Mfr. Part No.2SA2070(TE12L,F)
BrandToshiba
SGD0.268
Each (In a Pack of 10)
units
PNP 1 A 50 V SC-62 Surface Mount 2 W 125 Single -50 V -7 V - 3 1 -