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. 686-8045
Mfr. Part No.2SD882
TWD19.90
Each (In a Pack of 10)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 102-4116
Mfr. Part No.2SD882
TWD6.20
Each (In a Tube of 50)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 485-9727
Mfr. Part No.TIP3055
TWD26.20
Each (In a Pack of 5)
units
NPN 15 A 60 V TO-247 Through Hole 90 W 5 Single 100 V - 3 MHz 3 1 -
RS Stock No. 168-6168
Mfr. Part No.TIP3055
TWD23.80
Each (In a Tube of 30)
units
NPN 15 A 60 V TO-247 Through Hole 90 W 5 Single 100 V - 3 MHz 3 1 -
RS Stock No. 485-9812
Mfr. Part No.TIP41C
TWD20.60
Each (In a Pack of 5)
units
NPN 6 A 100 V TO-220 Through Hole 65 W 15 Single 100 V 5 V - 3 1 -
RS Stock No. 168-6171
Mfr. Part No.TIP41C
TWD17.60
Each (In a Tube of 50)
units
NPN 6 A 100 V TO-220 Through Hole 65 W 15 Single 100 V 5 V - 3 1 -
RS Stock No. 168-6172
Mfr. Part No.TIP47
TWD17.20
Each (In a Tube of 50)
units
NPN 1 A 250 V TO-220 Through Hole 2 W 10 Single 350 V 5 V 10 MHz 3 1 -
RS Stock No. 168-6173
Mfr. Part No.TIP50
TWD21.90
Each (In a Tube of 50)
units
NPN 1 A 400 V TO-220 Through Hole 2 W 10 Single 500 V 5 V 10 MHz 3 1 -
RS Stock No. 485-9834
Mfr. Part No.TIP47
TWD19.00
Each (In a Pack of 5)
units
NPN 1 A 250 V TO-220 Through Hole 2 W 10 Single 350 V 5 V 10 MHz 3 1 -
RS Stock No. 485-9856
Mfr. Part No.TIP50
TWD26.60
Each (In a Pack of 5)
units
NPN 1 A 400 V TO-220 Through Hole 2 W 10 Single 500 V 5 V 10 MHz 3 1 -
RS Stock No. 168-6784
Mfr. Part No.BD437
TWD21.60
Each (In a Tube of 50)
units
NPN 4 A 45 V SOT-32 Through Hole 36 W 30 Single 45 V 5 V - 3 1 -
RS Stock No. 714-0499
Mfr. Part No.BD437
TWD20.00
Each (In a Pack of 20)
units
NPN 4 A 45 V SOT-32 Through Hole 36 W 30 Single 45 V 5 V - 3 1 -
RS Stock No. 917-2741
Mfr. Part No.STN9360
TWD25.00
Each (In a Pack of 25)
units
PNP 500 mA 600 V SOT-223 Surface Mount 1.6 W 200 Single - -7 V - 3 + Tab 1 -
RS Stock No. 145-8939
Mfr. Part No.STN9360
TWD13.50
Each (On a Reel of 1000)
units
PNP 500 mA 600 V SOT-223 Surface Mount 1.6 W 200 Single - -7 V - 3 + Tab 1 -
RS Stock No. 178-5120
Mfr. Part No.2STF1360
TWD5.60
Each (On a Reel of 2500)
units
- - - - - - - - - - - - - -
RS Stock No. 686-7944
Mfr. Part No.2STF1360
TWD12.40
Each (In a Pack of 20)
units
NPN 3 A 60 V SOT-89 Surface Mount 1.4 W 80 Single 80 V 6 V 130 MHz 3 1 -
RS Stock No. 178-5050
Mfr. Part No.2STN1360
TWD6.30
Each (On a Reel of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 795-8959
Mfr. Part No.BCP56-16
TWD11.40
Each (In a Pack of 25)
units
NPN 1 A 80 V SOT-223 Surface Mount 1.6 W 25 Single 100 V 5 V - 3 + Tab 1 -
RS Stock No. 165-7771
Mfr. Part No.MJD31CT4
TWD7.70
Each (On a Reel of 2500)
units
NPN 3 A 100 V DPAK (TO-252) Surface Mount 15 W 3 Single 100 V 5 V - 3 1 -
RS Stock No. 686-8079
Mfr. Part No.BD140-16
TWD10.40
Each (In a Pack of 20)
units
PNP 1.5 A 80 V SOT-32 Through Hole 1.25 W 100 Single 80 V 5 V - 3 1 -