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. 121-9551
Mfr. Part No.DSS5240T-7
HK$0.588
Each (On a Reel of 3000)
units
PNP 2 A 40 V SOT-23 Surface Mount 600 mW 100 Single -40 V -5 V 100 MHz 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. 296-267
Mfr. Part No.MJ15003G
HK$33.71
Each
units
NPN 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
RS Stock No. 800-9298
Mfr. Part No.2SC4135S-TL-E
HK$4.158
Each (In a Pack of 25)
units
NPN 2 A 100 V TP-FA Through Hole 15 W 100 Single 120 V 6 V 390 MHz 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. 166-2988
Mfr. Part No.BC547B
HK$0.46
Each (In a Bag of 10000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 6 V 1 MHz 3 1 -
RS Stock No. 806-4627
Mfr. Part No.KSP92TA
HK$0.673
Each (In a Pack of 100)
units
PNP 500 mA 300 V TO-92 Through Hole 625 mW 25 Single -300 V -5 V 100 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. 922-7901
Mfr. Part No.FZT949TA
HK$3.737
Each (On a Reel of 1000)
units
PNP 5.5 A 30 V SOT-223 Surface Mount 3 W 75 Single 50 V 6 V 100 MHz 3 + Tab 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. 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. 295-523
Mfr. Part No.ZTX751
HK$6.24
Each (In a Pack of 5)
units
PNP 2 A 60 V E-Line Through Hole 1 W 40 Single 80 V 5 V 140 MHz 3 1 -
RS Stock No. 510-015
Mfr. Part No.PMBT4401,215
BrandNexperia
HK$0.682
Each (In a Pack of 50)
units
NPN 600 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 170-3462
Mfr. Part No.BCP56T3G
HK$0.565
Each (On a Reel of 4000)
units
NPN 1 A 80 V SOT-223 Surface Mount 1.5 W 25 Single 100 V 5 V 35 MHz 3 + Tab 1 -
RS Stock No. 663-8932
Mfr. Part No.CPH3215-TL-E
BrandSanyo
HK$2.93
Each (In a Pack of 5)
units
NPN 1.5 A 30 V CPH Surface Mount 900 mW 200 - 40 V 5 V 500 MHz 3 1 -
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. 813-6700
Mfr. Part No.BUJ100LR,412
HK$1.801
Each (In a Pack of 50)
units
NPN 1 A 700 V TO-92 Through Hole 2.1 W 5 Single 700 V 9 V - 3 1 -
RS Stock No. 545-0236
Mfr. Part No.MJ21194G
HK$51.76
Each
units
NPN 16 A 250 V TO-204 Through Hole 250 W 25 Single 400 V 5 V 4 MHz 3 1 -
RS Stock No. 103-2981
Mfr. Part No.D44H11G
HK$6.20
Each (In a Tube of 50)
units
NPN 10 A 80 V TO-220AB Through Hole 2 W 40 Single - 5 V 50 MHz 3 1 -
RS Stock No. 773-7642
Mfr. Part No.BCP56T3G
HK$2.045
Each (In a Pack of 10)
units
NPN 1 A 80 V SOT-223 Surface Mount 1.5 W 25 Single 100 V 5 V 35 MHz 3 + Tab 1 -
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