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. 756-3909
Mfr. Part No.TTC5200(Q)
BrandToshiba
$3.27
Each
units
NPN 15 A 230 V TO-3PL Through Hole 150 W 35 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 896-2656
Mfr. Part No.TTC5200(Q)
BrandToshiba
$3.97
Each (In a Pack of 2)
units
NPN 15 A 230 V 2-21F1A Through Hole 150 W 35 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 756-0269
Mfr. Part No.2SC5354-1(F)
BrandToshiba
$3.72
Each
units
NPN 5 A 800 V TO-3PN Through Hole 100 W 10 Single 900 V 7 V - 3 1 -
RS Stock No. 756-0265
Mfr. Part No.2SC5200-R(Q)
BrandToshiba
$5.53
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. 756-0622
Mfr. Part No.HN4B101J(TE85L,F)
BrandToshiba
$0.374
Each (In a Pack of 10)
units
NPN + PNP 1.2 A 30 V SMV Surface Mount 850 mW 125 Common Emitter -30 V, 50 V -7 (PNP) V, 7 (NPN) V - 5 2 -
RS Stock No. 799-4817
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
$3.804
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3PL Through Hole 150 W 35 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 890-2682
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
$4.666
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. 184-874
Mfr. Part No.2SC5242-O(Q)
BrandToshiba
$5.93
Each
units
NPN 15 A 230 V TO-3PN Through Hole 130 W 80 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 184-880
Mfr. Part No.2SA1962-O(Q)
BrandToshiba
$4.66
Each
units
PNP 15 A 230 V TO-3PN Through Hole 130 W 80 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 184-868
Mfr. Part No.2SC5198-O(Q)
BrandToshiba
$6.35
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. 362-840
Mfr. Part No.2SC5949-O(Q)
BrandToshiba
$3.55
Each
units
NPN 15 A 200 V TO-3PL Through Hole 220 W 80 Single 200 V 5 V 30 MHz 3 1 -
RS Stock No. 896-2653
Mfr. Part No.TTA1943(Q)
BrandToshiba
$3.92
Each (In a Pack of 2)
units
PNP 15 A 230 V 2-21F1A Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 601-1264
Mfr. Part No.2SA1986-O(Q)
BrandToshiba
$2.486
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3PN Through Hole 150 W 80 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 168-7405
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
$3.20
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
$6.80
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. 890-2648
Mfr. Part No.2SC3324-GR(TE85L,F
BrandToshiba
$0.438
Each (In a Pack of 25)
units
NPN 100 mA 120 V SOT-346 (SC-59) Surface Mount 150 mW 200 Single 120 V 120 V - 3 1 -
RS Stock No. 799-4808
Mfr. Part No.2SC5200N(S1,E,S)
BrandToshiba
$4.62
Each
units
NPN 15 A 230 V TO-3PN Through Hole 150 W 35 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 890-2689
Mfr. Part No.2SC5200N(S1,E,S)
BrandToshiba
$3.244
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3P Through Hole 150 W 35 Single 230 V 5 V - 3 1 -
RS Stock No. 601-1703
Mfr. Part No.2SC5358-O(Q)
BrandToshiba
$2.428
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. 890-2620
Mfr. Part No.2SA1943N(S1,E,S)
BrandToshiba
$2.784
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 -