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. 178-7544
Mfr. Part No.BC33725TAR
HK$0.325
Each (In a Bag of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 177-5495
Mfr. Part No.2N2222ACSM
BrandSemelab
HK$121.25
Each (In a Tray of 100)
units
NPN 800 mA 40 V LCC 1 Surface Mount 500 mW 50 Single 75 V 6 V 250 MHz 3 1 -
RS Stock No. 803-1138
Mfr. Part No.BC557BTF
HK$0.446
Each (In a Pack of 200)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 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. 163-1098
Mfr. Part No.NSS40201LT1G
HK$0.89
Each (On a Reel of 3000)
units
NPN 2 A 40 V SOT-23 Surface Mount 460 mW 180 Single 40 V dc 6 V 100 MHz 3 1 -
RS Stock No. 145-5537
Mfr. Part No.SS8050DTA
HK$0.351
Each (On a Tape of 2000)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
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. 544-901
Mfr. Part No.2SC3601E
BrandSanyo
HK$10.20
Each (In a Pack of 5)
units
NPN 150 mA 200 V TO-126 Through Hole 1.2 W 20 - 200 V 4 V 400 MHz 3 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. 121-9550
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. 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. 774-3212
Mfr. Part No.2N3055AG
HK$40.66
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. 739-0335
Mfr. Part No.SS8050DTA
HK$1.13
Each (In a Pack of 10)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS Stock No. 781-5092
Mfr. Part No.NSS40201LT1G
HK$2.356
Each (In a Pack of 20)
units
NPN 2 A 40 V SOT-23 Surface Mount 460 mW 180 Single 40 V dc 6 V 100 MHz 3 1 -
RS Stock No. 166-1312
Mfr. Part No.BC857C,215
BrandNexperia
HK$0.10
Each (On a Reel of 3000)
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. 796-9690
Mfr. Part No.BC546B A1
HK$0.314
Each (In a Pack of 250)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 200 Single 80 V 6 V - 3 1 -
RS Stock No. 739-0307
Mfr. Part No.SS8050DBU
HK$1.50
Each (In a Pack of 10)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS Stock No. 170-7962
Mfr. Part No.BC857C,235
BrandNexperia
HK$0.113
Each (On a Reel of 10000)
units
PNP 100 mA -45 V SOT-23 Surface Mount 250 mW 420 Single -50 V -5 V - 3 1 AEC-Q101
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. 166-3785
Mfr. Part No.KSC1845FTA
HK$0.276
Each (On a Tape of 2000)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
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