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. 464-221
Mfr. Part No.2N4401G
HK$1.00
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. 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. 145-4158
Mfr. Part No.2SD1803T-TL-H
HK$3.48
Each (On a Reel of 700)
units
NPN 5 A 50 V TP-FA Surface Mount 20 W 35 Single 60 V 6 V 180 MHz 3 1 -
RS Stock No. 121-9419
Mfr. Part No.FZT857TA
HK$3.652
Each (On a Reel of 1000)
units
NPN 3.5 A 300 V SOT-223 Surface Mount 3 W 15 Single 350 V 6 V 80 MHz 3 + Tab 1 -
RS Stock No. 669-7357
Mfr. Part No.FZT857TA
HK$7.102
Each (In a Pack of 5)
units
NPN 3.5 A 300 V SOT-223 Surface Mount 3 W 15 Single 350 V 6 V 80 MHz 3 + Tab 1 -
RS Stock No. 545-2816
Mfr. Part No.BCP56T1G
HK$0.744
Each (On a Reel of 1000)
units
NPN 1 A 80 V SOT-223 Surface Mount 1.5 W 25 Single 100 V 5 V 130 MHz 3 + Tab 1 -
RS Stock No. 168-9634
Mfr. Part No.PBSS4240Y,115
BrandNexperia
HK$0.933
Each (On a Reel of 3000)
units
NPN 2 A 40 V UMT Surface Mount 430 mW 150 Single 40 V 5 V 230 MHz 6 1 -
RS Stock No. 169-8595
Mfr. Part No.BD13910STU
HK$1.722
Each (In a Tube of 60)
units
NPN 1.5 A 80 V TO-126 Through Hole 12.5 W 40 Single 80 V 5 V - 3 1 -
RS Stock No. 751-5445
Mfr. Part No.ZXTN25100BFHTA
HK$3.297
Each (In a Pack of 25)
units
NPN 3 A 100 V SOT-23 Surface Mount 1.81 W 50 Single 170 V 7 V 160 MHz 3 1 -
RS Stock No. 822-8644
Mfr. Part No.2DD2656-7
HK$0.637
Each (In a Pack of 100)
units
NPN 1 A 30 V SOT-323 (SC-70) Surface Mount 500 mW 270 Single 30 V 6 V 270 MHz 3 1 -
RS Stock No. 805-1084
Mfr. Part No.2N4403TFR
HK$0.849
Each (In a Pack of 200)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single -40 V -5 V 200 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. 165-8684
Mfr. Part No.DXT5551-13
HK$0.692
Each (On a Reel of 2500)
units
NPN 600 mA 160 V SOT-89 Surface Mount 1.2 W 200 Single 180 V 6 V 300 MHz 3 1 -
RS Stock No. 145-4730
Mfr. Part No.MMBT2222LT1G
HK$0.131
Each (On a Reel of 3000)
units
NPN 600 mA 30 V SOT-23 Surface Mount 225 mW 30 Single 60 V dc 5 V 100 MHz 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. 165-9789
Mfr. Part No.BUJ100LR,412
HK$0.539
Each (On a Reel of 5000)
units
NPN 1 A 700 V TO-92 Through Hole 2.1 W 5 Single 700 V 9 V - 3 1 -
RS Stock No. 145-4374
Mfr. Part No.KSA1010YTU
HK$4.546
Each (In a Tube of 50)
units
PNP 7 A 100 V TO-220 Through Hole 40 W 20 Single -100 V -7 V - 3 1 -
RS Stock No. 625-5076
Mfr. Part No.D44H11G
HK$7.27
Each
units
NPN 10 A 80 V TO-220AB Through Hole 2 W 40 Single - 5 V 50 MHz 3 1 -
RS Stock No. 464-237
Mfr. Part No.MJL4302AG
HK$45.01
Each
units
PNP 15 A 350 V TO-3BPL Through Hole 230 W 10 Single 350 V 5 V 35 MHz 3 1 -
RS Stock No. 862-4979
Mfr. Part No.MJ21193G
HK$50.115
Each (In a Pack of 2)
units
PNP 16 A 250 V TO-204AA Through Hole 250 W 8 Single -400 V -5 V - 2 1 -
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