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. 121-9416
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. 112-5475
Mfr. Part No.PZT2907A,115
BrandNexperia
HK$3.514
Each (In a Pack of 5)
units
PNP 600 mA 60 V SOT-223 (SC-73) Surface Mount 1.15 W 50 Single 60 V 5 V 200 MHz 4 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. 508-236
Mfr. Part No.BC857C,215
BrandNexperia
HK$0.246
Each (In a Pack of 100)
units
PNP 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 420 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 121-9987
Mfr. Part No.FZT957TA
HK$4.119
Each (On a Reel of 1000)
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. 669-7593
Mfr. Part No.FZT957TA
HK$7.648
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. 170-4155
Mfr. Part No.BC546B A1
HK$0.187
Each (On a Tape of 4000)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 200 Single 80 V 6 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. 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. 796-9681
Mfr. Part No.BC338-16 A1
HK$0.303
Each (In a Pack of 250)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW 100 Single 30 V 5 V - 3 1 -
RS Stock No. 806-4475
Mfr. Part No.KSC1845FTA
HK$0.685
Each (In a Pack of 200)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 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. 601-1113
Mfr. Part No.2SA1048-GR(F)
BrandToshiba
HK$1.04
Each (In a Pack of 10)
units
PNP 150 mA 50 V E-Line Surface Mount 200 mW 200 - 50 V 5 V 80 MHz 3 1 -
RS Stock No. 796-9694
Mfr. Part No.BC546C A1
HK$0.314
Each (In a Pack of 250)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 420 Single 80 V 6 V - 3 1 -
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. 296-273
Mfr. Part No.MJ15004G
HK$37.94
Each
units
PNP 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 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. 166-3072
Mfr. Part No.BC556BTA
HK$0.206
Each (On a Tape of 2000)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 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. 178-7164
Mfr. Part No.BCX70H,215
BrandNexperia
HK$0.222
Each (On a Reel of 3000)
units
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