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. 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. 169-0600
Mfr. Part No.ZXTP5401GTA
TWD5.80
Each (On a Reel of 1000)
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. 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. 145-8821
Mfr. Part No.SMBT2222AE6327HTSA1
BrandInfineon
TWD0.60
Each (On a Reel of 3000)
units
NPN 600 mA 40 V SOT-23 Surface Mount 330 mW 100 Single 75 V 6 V 300 (Min.) MHz 3 1 -
RS Stock No. 445-2146
Mfr. Part No.BDP949
BrandInfineon
TWD21.40
Each (In a Pack of 5)
units
NPN 3 A 60 V SOT-223 Surface Mount 5 W 25 Single 60 V 5 V 100 MHz 3 + Tab 1 -
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. 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. 806-4541
Mfr. Part No.KSD1691GSTU
TWD12.50
Each (In a Pack of 20)
units
NPN 5 A 60 V TO-126 Through Hole 20 W 50 Single 60 V 7 V - 3 1 -
RS Stock No. 168-6173
Mfr. Part No.TIP50
TWD8.80
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. 168-6172
Mfr. Part No.TIP47
TWD8.30
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. 125-0072
Mfr. Part No.MJE15030G
TWD43.40
Each (In a Tube of 50)
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. 163-1996
Mfr. Part No.2SB1124T-TD-E
TWD7.70
Each (On a Reel of 1000)
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. 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. 155-024
Mfr. Part No.ZXTP2029FTA
TWD11.20
Each (In a Pack of 10)
units
PNP 3 A 100 V SOT-23 Surface Mount 1.56 W 40 Single 130 V 7 V 150 MHz 3 1 -
RS Stock No. 169-8617
Mfr. Part No.BC550CTA
TWD1.00
Each (On a Tape of 2000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 5 V 1 MHz 3 1 -
RS Stock No. 122-0087
Mfr. Part No.MJ15024G
TWD135.40
Each (In a Tray of 100)
units
NPN 16 A 250 V TO-204 Through Hole 250 W 5 Single 400 V 5 V 4 MHz 3 1 -
RS Stock No. 711-4878
Mfr. Part No.MMBT3906-7-F
TWD1.10
Each (In a Pack of 100)
units
PNP 200 mA 40 V SOT-23 Surface Mount 300 mW 30 Single -40 V -5 V - 3 1 -
RS Stock No. 756-0284
Mfr. Part No.2SC5712(TE12L,F)
BrandToshiba
TWD7.90
Each (In a Pack of 10)
units
NPN 3 A 50 V SC-62 Surface Mount 2.5 W 200 Single 100 V 7 V - 3 1 -
RS Stock No. 826-8421
Mfr. Part No.2SC5824T100Q
BrandROHM
TWD10.30
Each (In a Pack of 20)
units
NPN 3 A 60 V SC-62 Surface Mount 2 W 120 Single 60 V 6 V 10 MHz 3 1 -
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