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. 793-0775
Mfr. Part No.MMBTA56LT3G
TWD1.70
Each (In a Pack of 100)
units
PNP 500 mA 80 V SOT-23 Surface Mount 225 mW 100 Single -80 V dc -4 V 100 MHz 3 1 -
RS Stock No. 806-4447
Mfr. Part No.KSA992FBU
TWD2.20
Each (In a Pack of 200)
units
PNP 50 mA 120 V TO-92 Through Hole 500 mW 150 Single -120 V -5 V 1 MHz 3 1 -
RS Stock No. 145-4783
Mfr. Part No.MMBTA56LT3G
TWD0.70
Each (On a Reel of 10000)
units
PNP 500 mA 80 V SOT-23 Surface Mount 225 mW 100 Single -80 V dc -4 V 100 MHz 3 1 -
RS Stock No. 166-3611
Mfr. Part No.KSA992FBU
TWD1.00
Each (In a Bag of 10000)
units
PNP 50 mA 120 V TO-92 Through Hole 500 mW 150 Single -120 V -5 V 1 MHz 3 1 -
RS Stock No. 922-7803
Mfr. Part No.FZT951TA
TWD14.70
Each (On a Reel of 1000)
units
PNP 5 A 60 V SOT-223 Surface Mount 3 W 10 Single 100 V 6 V 120 MHz 3 + Tab 1 -
RS Stock No. 464-221
Mfr. Part No.2N4401G
TWD6.00
Each (In a Pack of 200)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 - 60 V 6 V 250 MHz 3 1 -
RS Stock No. 792-5010
Mfr. Part No.2SB1124T-TD-E
TWD14.60
Each (On a Tape of 25)
units
PNP 3 A 50 V PCP Surface Mount 1.5 W 35 Single -60 V -6 V 150 MHz 3 1 -
RS Stock No. 544-9680
Mfr. Part No.MJE15030G
TWD51.00
Each
units
NPN 8 A 150 V TO-220AB Through Hole 50 W 20 Single 150 V 5 V 30 MHz 3 1 -
RS Stock No. 145-5537
Mfr. Part No.SS8050DTA
TWD1.00
Each (On a Tape of 2000)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS Stock No. 145-3904
Mfr. Part No.SMMBT2222ALT1G
TWD1.00
Each (On a Reel of 3000)
units
NPN 600 mA 40 V SOT-23 Surface Mount 225 mW 40 Single 75 V dc 6 V 100 MHz 3 1 AEC-Q101
RS Stock No. 781-5222
Mfr. Part No.SMMBT2222ALT1G
TWD2.40
Each (In a Pack of 100)
units
NPN 600 mA 40 V SOT-23 Surface Mount 225 mW 40 Single 75 V dc 6 V 100 MHz 3 1 AEC-Q101
RS Stock No. 485-9834
Mfr. Part No.TIP47
TWD19.40
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. 168-6171
Mfr. Part No.TIP41C
TWD7.20
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. 484-5188
Mfr. Part No.BCX55-16,115
BrandNexperia
TWD4.40
Each (In a Pack of 25)
units
NPN 1 A 60 V UPAK Surface Mount 1.25 W 100 Single 60 V 5 V 180 MHz 4 1 -
RS Stock No. 166-2584
Mfr. Part No.SS8050DBU
TWD1.10
Each (In a Bag of 10000)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS Stock No. 911-4713
Mfr. Part No.BDP949
BrandInfineon
TWD8.20
Each (On a Reel of 1000)
units
NPN 3 A 60 V SOT-223 Surface Mount 5 W 50 Single 60 V 5 V 100 MHz 4 1 -
RS Stock No. 485-9856
Mfr. Part No.TIP50
TWD20.40
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. 739-0307
Mfr. Part No.SS8050DBU
TWD3.20
Each (In a Pack of 10)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS Stock No. 711-4957
Mfr. Part No.ZXTP5401GTA
TWD8.30
Each (In a Pack of 10)
units
PNP 600 mA 150 V SOT-223 Surface Mount 2 W 50 Single -160 V -5 V 100 MHz 3 + Tab 1 -
RS Stock No. 544-9646
Mfr. Part No.MJ15024G
TWD192.00
Each
units
NPN 16 A 250 V TO-204 Through Hole 250 W 5 Single 400 V 5 V 4 MHz 3 1 -