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. 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. 178-4767
Mfr. Part No.TIP30CG
HK$3.771
Each (In a Tube of 50)
units
PNP 1 A 100 V TO-220AB Through Hole 30 W 15 Single 100 V 5 V 1 MHz 3 1 -
RS Stock No. 803-1083
Mfr. Part No.BC547BBU
HK$0.42
Each (In a Pack of 200)
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. 739-0492
Mfr. Part No.PN2907ATA
HK$1.57
Each (In a Pack of 10)
units
PNP 800 mA 60 V TO-92 Through Hole 625 mW 50 Single 60 V 5 V - 3 1 -
RS Stock No. 165-8804
Mfr. Part No.BC846AW-7-F
HK$0.126
Each (On a Reel of 3000)
units
NPN 100 mA 65 V SOT-323 (SC-70) Surface Mount 200 mW 110 Single 80 V 6 V 100 MHz 3 1 -
RS Stock No. 178-4685
Mfr. Part No.2N4403BU
HK$0.257
Each (In a Bag of 10000)
units
- - - - - - - - - - - - - -
RS Stock No. 145-4730
Mfr. Part No.MMBT2222LT1G
HK$0.131
Each (On a Reel of 3000)
units
NPN 600 mA 30 V SOT-23 Surface Mount 225 mW 30 Single 60 V dc 5 V 100 MHz 3 1 -
RS Stock No. 178-7546
Mfr. Part No.2N4403TFR
HK$0.451
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 748-4991
Mfr. Part No.BC847B RF
HK$0.313
Each (In a Pack of 200)
units
NPN 100 mA 45 V SOT-23 Surface Mount 250 mW 200 Single 50 V 6 V 100 MHz 3 1 -
RS Stock No. 168-9634
Mfr. Part No.PBSS4240Y,115
BrandNexperia
HK$0.933
Each (On a Reel of 3000)
units
NPN 2 A 40 V UMT Surface Mount 430 mW 150 Single 40 V 5 V 230 MHz 6 1 -
RS Stock No. 806-4392
Mfr. Part No.KSA1010YTU
HK$6.53
Each (In a Pack of 10)
units
PNP 7 A 100 V TO-220 Through Hole 40 W 20 Single -100 V -7 V - 3 1 -
RS Stock No. 166-3117
Mfr. Part No.PN2907ATFR
HK$0.331
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. 163-2001
Mfr. Part No.2SC4135S-TL-E
HK$2.57
Each (On a Reel of 700)
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. 178-7545
Mfr. Part No.2N4403TAR
HK$0.457
Each (In a Bag of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 166-3792
Mfr. Part No.KSP92TA
HK$0.385
Each (On a Tape of 2000)
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. 725-8616
Mfr. Part No.MMBT3904,215
BrandNexperia
HK$0.467
Each (In a Pack of 50)
units
NPN 200 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW 30 Single 60 V 6 V - 3 1 -
RS Stock No. 739-0445
Mfr. Part No.2N4403TA
HK$1.081
Each (In a Pack of 10)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 40 V 5 V - 3 1 -
RS Stock No. 805-1071
Mfr. Part No.2N4403BU
HK$0.573
Each (In a Pack of 200)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single -40 V -5 V 200 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. 751-4307
Mfr. Part No.DSS5240T-7
HK$1.06
Each (On a Tape of 100)
units
PNP 2 A 40 V SOT-23 Surface Mount 600 mW 100 Single -40 V -5 V 100 MHz 3 1 -