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. 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. 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. 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. 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. 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. 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 -
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. 165-8848
Mfr. Part No.2DD2656-7
HK$0.399
Each (On a Reel of 3000)
units
NPN 1 A 30 V SOT-323 (SC-70) Surface Mount 500 mW 270 Single 30 V 6 V 270 MHz 3 1 -
RS Stock No. 922-7740
Mfr. Part No.ZTX753
HK$3.16
Each (In a Bag of 4000)
units
PNP 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 140 MHz 3 1 -
RS Stock No. 669-7509
Mfr. Part No.FZT949TA
HK$9.12
Each (In a Pack of 5)
units
PNP 5.5 A 30 V SOT-223 Surface Mount 3 W 75 Single 50 V 6 V 100 MHz 3 + Tab 1 -
RS Stock No. 669-7357
Mfr. Part No.FZT857TA
HK$7.102
Each (In a Pack of 5)
units
NPN 3.5 A 300 V SOT-223 Surface Mount 3 W 15 Single 350 V 6 V 80 MHz 3 + Tab 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 -
RS Stock No. 751-5445
Mfr. Part No.ZXTN25100BFHTA
HK$3.297
Each (In a Pack of 25)
units
NPN 3 A 100 V SOT-23 Surface Mount 1.81 W 50 Single 170 V 7 V 160 MHz 3 1 -
RS Stock No. 121-9419
Mfr. Part No.FZT857TA
HK$3.652
Each (On a Reel of 1000)
units
NPN 3.5 A 300 V SOT-223 Surface Mount 3 W 15 Single 350 V 6 V 80 MHz 3 + Tab 1 -
RS Stock No. 922-7746
Mfr. Part No.ZTX751
HK$2.847
Each (In a Box of 4000)
units
PNP 2 A 60 V E-Line Through Hole 1 W 40 Single 80 V 5 V 140 MHz 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. 922-7901
Mfr. Part No.FZT949TA
HK$3.737
Each (On a Reel of 1000)
units
PNP 5.5 A 30 V SOT-223 Surface Mount 3 W 75 Single 50 V 6 V 100 MHz 3 + Tab 1 -
RS Stock No. 121-9551
Mfr. Part No.DSS5240T-7
HK$0.588
Each (On a Reel of 3000)
units
PNP 2 A 40 V SOT-23 Surface Mount 600 mW 100 Single -40 V -5 V 100 MHz 3 1 -
RS Stock No. 822-8988
Mfr. Part No.BC846AW-7-F
HK$0.274
Each (In a Pack of 250)
units
NPN 100 mA 65 V SOT-323 (SC-70) Surface Mount 200 mW 110 Single 80 V 6 V 100 MHz 3 1 -