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. 314-1823
Mfr. Part No.BD139
HK$3.89
Each
units
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS Stock No. 168-6075
Mfr. Part No.BD139
HK$3.846
Each (In a Tube of 50)
units
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS Stock No. 102-4116
Mfr. Part No.2SD882
HK$3.985
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. 168-6253
Mfr. Part No.MJE2955T
HK$4.483
Each (In a Tube of 50)
units
PNP 10 A 60 V TO-220 Through Hole 75 W 5 Single 70 V 5 V 2 MHz 3 1 -
RS Stock No. 486-4561
Mfr. Part No.MJE2955T
HK$5.76
Each (In a Pack of 5)
units
PNP 10 A 60 V TO-220 Through Hole 75 W 5 Single 70 V 5 V 2 MHz 3 1 -
RS Stock No. 486-4577
Mfr. Part No.MJE350
HK$4.426
Each (In a Pack of 5)
units
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W 30 Single 300 V 3 V - 3 1 -
RS Stock No. 168-6254
Mfr. Part No.MJE350
HK$3.482
Each (In a Tube of 50)
units
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W 30 Single 300 V 3 V - 3 1 -
RS Stock No. 686-8045
Mfr. Part No.2SD882
HK$5.204
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. 168-7288
Mfr. Part No.TIP29A
HK$3.962
Each (In a Tube of 50)
units
NPN 1 A 60 V TO-220 Through Hole 30 W 15 Single 60 V 5 V - 3 1 -
RS Stock No. 168-6815
Mfr. Part No.MJE340
HK$2.987
Each (In a Tube of 50)
units
NPN 500 mA 300 V SOT-32 Through Hole 2.8 W 30 Single 300 V 3 V - 3 1 -
RS Stock No. 485-9727
Mfr. Part No.TIP3055
HK$9.792
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. 145-8939
Mfr. Part No.STN9360
HK$2.101
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. 168-6168
Mfr. Part No.TIP3055
HK$5.366
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. 485-9115
Mfr. Part No.D44H11
HK$7.096
Each (In a Pack of 5)
units
NPN 20 A 80 V TO-220 Through Hole 50 W 40 Single 80 V 5 V - 3 1 -
RS Stock No. 168-6136
Mfr. Part No.D44H11
HK$6.296
Each (In a Tube of 50)
units
NPN 20 A 80 V TO-220 Through Hole 50 W 40 Single 80 V 5 V - 3 1 -
RS Stock No. 917-2741
Mfr. Part No.STN9360
HK$4.504
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. 795-8808
Mfr. Part No.TIP29A
HK$4.313
Each (In a Pack of 10)
units
NPN 1 A 60 V TO-220 Through Hole 30 W 15 Single 60 V 5 V - 3 1 -
RS Stock No. 168-6169
Mfr. Part No.TIP31A
HK$3.208
Each (In a Tube of 50)
units
NPN 3 A 60 V TO-220 Through Hole 2 W 10 Single 60 V 5 V - 3 1 -
RS Stock No. 714-0997
Mfr. Part No.MJE340
HK$3.886
Each (In a Pack of 10)
units
NPN 500 mA 300 V SOT-32 Through Hole 2.8 W 30 Single 300 V 3 V - 3 1 -
RS Stock No. 485-9749
Mfr. Part No.TIP31A
HK$4.132
Each (In a Pack of 5)
units
NPN 3 A 60 V TO-220 Through Hole 2 W 10 Single 60 V 5 V - 3 1 -