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. 314-1817
Mfr. Part No.BD140
PHP30.53
Each
units
PNP 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS Stock No. 168-6074
Mfr. Part No.BD140
PHP25.327
Each (In a Tube of 50)
units
PNP 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS Stock No. 251-3564
Mfr. Part No.TIP35C
PHP105.50
Each
units
NPN 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 168-6056
Mfr. Part No.TIP35C
PHP89.434
Each (In a Tube of 30)
units
NPN 25 A 100 V TO-247 Through Hole 125 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 890-2689
Mfr. Part No.2SC5200N(S1,E,S)
BrandToshiba
PHP116.278
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. 806-4475
Mfr. Part No.KSC1845FTA
PHP4.20
Each (In a Pack of 200)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS Stock No. 802-4546
Mfr. Part No.MJL21195G
PHP247.80
Each (In a Pack of 2)
units
PNP 16 A 250 V TO-264 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
RS Stock No. 799-4808
Mfr. Part No.2SC5200N(S1,E,S)
BrandToshiba
PHP118.65
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. 145-3183
Mfr. Part No.MJL21195G
PHP210.53
Each (In a Tube of 25)
units
PNP 16 A 250 V TO-264 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
RS Stock No. 166-3785
Mfr. Part No.KSC1845FTA
PHP2.26
Each (On a Tape of 2000)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS Stock No. 436-7947
Mfr. Part No.BC847B,215
BrandNexperia
PHP6.212
Each (In a Pack of 50)
units
NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 200 Single 50 V 6 V 100 MHz 3 1 -
RS Stock No. 896-2656
Mfr. Part No.TTC5200(Q)
BrandToshiba
PHP144.90
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. 739-0394
Mfr. Part No.2N4401TA
PHP12.215
Each (In a Pack of 10)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V - 3 1 -
RS Stock No. 890-2620
Mfr. Part No.2SA1943N(S1,E,S)
BrandToshiba
PHP126.918
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. 739-0439
Mfr. Part No.2N4401BU
PHP11.622
Each (In a Pack of 10)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V - 3 1 -
RS Stock No. 122-0085
Mfr. Part No.2N3773G
PHP251.48
Each (In a Tray of 100)
units
NPN 16 A 140 V TO-204 Through Hole 150 W 5 Single 160 V 7 V - 3 1 -
RS Stock No. 544-9270
Mfr. Part No.2N3773G
PHP343.26
Each
units
NPN 16 A 140 V TO-204 Through Hole 150 W 5 Single 160 V 7 V - 3 1 -
RS Stock No. 121-6420
Mfr. Part No.MJW21195G
PHP177.45
Each (In a Tube of 30)
units
PNP 16 A 250 V TO-247 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
RS Stock No. 166-2728
Mfr. Part No.2N4401BU
PHP1.979
Each (In a Bag of 10000)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 485-9755
Mfr. Part No.TIP31C
PHP29.988
Each (In a Pack of 5)
units
NPN 3 A 100 V TO-220 Through Hole 2 W 10 Single 100 V 5 V - 3 1 -
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