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. 774-3568
Mfr. Part No.MJE13007G
HK$8.194
Each (In a Pack of 5)
units
NPN 8 A 400 V TO-220AB Through Hole 80 W 5 Single 700 V 9 V 1 MHz 3 1 -
RS Stock No. 801-5580
Mfr. Part No.PBHV9115X,115
BrandNexperia
HK$2.95
Each (In a Pack of 10)
units
PNP 1 A 150 V SOT-89 Surface Mount 1.5 W 10 Single -200 V -6 V 100 MHz 3 1 -
RS Stock No. 807-5099
Mfr. Part No.BCP54
HK$2.005
Each (In a Pack of 50)
units
NPN 1.5 A 45 V SOT-223 Surface Mount 1.5 W 150 Single 45 V 5 V - 3 + Tab 1 -
RS Stock No. 178-7164
Mfr. Part No.BCX70H,215
BrandNexperia
HK$0.222
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 806-1319
Mfr. Part No.PN2907ATF
HK$0.617
Each (In a Pack of 200)
units
PNP 800 mA 60 V TO-92 Through Hole 625 mW 100 Single -60 V -5 V 100 MHz 3 1 -
RS Stock No. 545-0517
Mfr. Part No.TIP50G
HK$5.53
Each
units
NPN 1 A 400 V TO-220AB Through Hole 40 W 10 Single 500 V 5 V 10 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. 102-1375
Mfr. Part No.MJE15032G
HK$9.986
Each (In a Tube of 50)
units
NPN 8 A 250 V TO-220AB Through Hole 2 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 803-1116
Mfr. Part No.BC550CBU
HK$0.492
Each (In a Pack of 200)
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. 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. 739-0410
Mfr. Part No.MMBT2907A
HK$1.473
Each (In a Pack of 10)
units
PNP 800 mA 60 V SOT-23 Surface Mount 350 mW 50 Single 60 V 5 V - 3 1 -
RS Stock No. 663-8493
Mfr. Part No.2SC2909S-AA
BrandSanyo
HK$2.02
Each (In a Pack of 5)
units
NPN 5 A 160 V NP Through Hole 600 mW 140 - 180 V 5 V 150 MHz 3 1 -
RS Stock No. 102-2276
Mfr. Part No.MJE15033G
HK$9.986
Each (In a Tube of 50)
units
PNP 8 A 250 V TO-220AB Through Hole 50 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 166-3709
Mfr. Part No.BCP54
HK$1.07
Each (On a Reel of 4000)
units
NPN 1.5 A 45 V SOT-223 Surface Mount 1.5 W 150 Single 45 V 5 V - 3 + Tab 1 -
RS Stock No. 463-634
Mfr. Part No.MJE15032G
HK$11.102
Each (In a Pack of 5)
units
NPN 8 A 250 V TO-220AB Through Hole 2 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 145-5501
Mfr. Part No.PN2907ATF
HK$0.236
Each (On a Reel of 2000)
units
PNP 800 mA 60 V TO-92 Through Hole 625 mW 100 Single -60 V -5 V 100 MHz 3 1 -
RS Stock No. 761-9831
Mfr. Part No.BC556BTA
HK$0.462
Each (In a Pack of 100)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 150 MHz 3 1 -
RS Stock No. 669-7521
Mfr. Part No.FCX491ATA
HK$2.91
Each (In a Pack of 25)
units
NPN 1 A 40 V SOT-89 Surface Mount 1 W 35 Single 40 V 5 V 150 MHz 3 1 -
RS Stock No. 464-158
Mfr. Part No.MJE15033G
HK$10.924
Each (In a Pack of 5)
units
PNP 8 A 250 V TO-220AB Through Hole 50 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 166-0392
Mfr. Part No.FCX491ATA
HK$1.435
Each (On a Reel of 1000)
units
NPN 1 A 40 V SOT-89 Surface Mount 1 W 35 Single 40 V 5 V 150 MHz 3 1 -
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