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 madeA 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 transistorTransistors 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. 170-4153
Mfr. Part No.BC338-16 A1
HK$0.199
Each (On a Tape of 4000)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW 100 Single 30 V 5 V - 3 1 -
RS Stock No. 177-5499
Mfr. Part No.2N2907ACSM
BrandSemelab
HK$125.77
Each (In a Tray of 100)
units
PNP 600 mA 60 V LCC 1 Surface Mount 500 mW 75 Single -60 V -5 V - 3 1 -
RS Stock No. 669-7593
Mfr. Part No.FZT957TA
HK$8.222
Each (In a Pack of 5)
units
PNP 1 A 300 V SOT-223 Surface Mount 3 W 90 Single 300 V 6 V 85 MHz 3 + Tab 1 -
RS Stock No. 774-3212
Mfr. Part No.2N3055AG
HK$51.69
Each
units
NPN 15 A 60 V TO-204AA Through Hole 115 W 5 Single 100 V 7 V 1 MHz 2 1 -
RS Stock No. 751-4290
Mfr. Part No.DSS4240T-7
HK$0.927
Each (On a Tape of 100)
units
NPN 2 A 40 V SOT-23 Surface Mount 600 mW 150 Single 40 V 5 V 100 MHz 3 1 -
RS Stock No. 121-9416
Mfr. Part No.FZT849TA
HK$3.759
Each (On a Reel of 1000)
units
NPN 7 A 30 V SOT-223 Surface Mount 3 W 30 Single 80 V 6 V 100 MHz 3 + Tab 1 -
RS Stock No. 121-9550
Mfr. Part No.DSS4240T-7
HK$0.528
Each (On a Reel of 3000)
units
NPN 2 A 40 V SOT-23 Surface Mount 600 mW 150 Single 40 V 5 V 100 MHz 3 1 -
RS Stock No. 166-2584
Mfr. Part No.SS8050DBU
HK$0.281
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. 215-6600
Mfr. Part No.FZT849TA
HK$8.52
Each
units
NPN 7 A 30 V SOT-223 Surface Mount 3 W 30 Single 80 V 6 V 100 MHz 3 + Tab 1 -
RS Stock No. 738-7584
Mfr. Part No.2N2907ACSM
BrandSemelab
HK$125.77
Each
units
PNP 600 mA 60 V LCC 1 Surface Mount 500 mW 75 Single -60 V -5 V - 3 1 -
RS Stock No. 438-4598
Mfr. Part No.BCP53,115
BrandNexperia
HK$0.573
Each (On a Reel of 1000)
units
PNP 1 A 80 V SOT-223 (SC-73) Surface Mount 1 W 40 Single 100 V 5 V 145 MHz 4 1 -
RS Stock No. 124-9936
Mfr. Part No.2N3055AG
HK$28.672
Each (In a Tray of 100)
units
NPN 15 A 60 V TO-204 Through Hole 115 W 5 Single 100 V 7 V 1 MHz 2 1 -
RS Stock No. 686-8045
Mfr. Part No.2SD882
HK$5.204
Each (In a Pack of 10)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 112-5469
Mfr. Part No.PZT2222A,115
BrandNexperia
HK$3.85
Each
units
NPN 600 mA 40 V SOT-223 (SC-73) Surface Mount 1.15 W 35 Single 75 V 6 V 300 MHz 4 1 -
RS Stock No. 803-1116
Mfr. Part No.BC550CBU
HK$0.528
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. 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. 102-4116
Mfr. Part No.2SD882
HK$3.985
Each (In a Tube of 50)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 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. 774-3568
Mfr. Part No.MJE13007G
HK$8.80
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. 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 -
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