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. 826-8428
Mfr. Part No.2SC5103TLQ
BrandROHM
HK$6.42
Each (In a Pack of 10)
units
NPN 5 A 60 V SC-63 Surface Mount 10 W 120 Single 100 V 5 V 30 MHz 3 1 -
RS Stock No. 826-8504
Mfr. Part No.2SD2703TL
BrandROHM
HK$2.462
Each (In a Pack of 40)
units
NPN 1 A 30 V TUMT Surface Mount 800 mW 270 Single 30 V 6 V 100 MHz 3 1 -
RS Stock No. 826-8440
Mfr. Part No.2SD1781KT146R
BrandROHM
HK$1.669
Each (In a Pack of 60)
units
NPN 800 mA 32 V SOT-346 (SC-59) Surface Mount 200 mW 120 Single 40 V 5 V 100 MHz 3 1 -
RS Stock No. 168-1898
Mfr. Part No.DTC044EEBTL
BrandROHM
HK$0.204
Each (In a Pack of 250)
units
NPN 100 mA - SOT-416FL Surface Mount 150 mW 80 Single - - 250 MHz 3 1 -
RS Stock No. 826-8550
Mfr. Part No.IMT1AT110
BrandROHM
HK$1.556
Each (In a Pack of 60)
units
PNP 150 mA 50 V SC-74 Surface Mount 300 mW 120 Isolated -60 V -6 V 100 MHz 6 2 -
RS Stock No. 128-8838
Mfr. Part No.2SCR544RTL
BrandROHM
HK$2.441
Each (In a Pack of 25)
units
NPN 2.5 A 80 V SOT-346T (SC-96) Surface Mount 500 mW 120 Common Emitter 80 V 6 V 100 MHz 3 1 -
RS Stock No. 183-5274
Mfr. Part No.VT6X1T2R
BrandROHM
HK$0.762
Each (In a Pack of 80)
units
NPN 200 mA 20 V VMT6 Surface Mount 150 mW 120 - 20 V 5 V 100 MHz 6 2 -
RS Stock No. 700-2779
Mfr. Part No.UMT1NTN
BrandROHM
HK$1.559
Each (In a Pack of 25)
units
PNP 150 mA 50 V UMT Surface Mount 150 mW 120 Isolated 60 V 6 V 140 MHz 6 2 -
RS Stock No. 183-4619
Mfr. Part No.BC846BT116
BrandROHM
HK$0.254
Each (On a Reel of 3000)
units
NPN 120 mA 65 V SOT-23 Surface Mount 350 mW 200 Single 80 V 6 V 100 MHz 3 1 -
RS Stock No. 177-6751
Mfr. Part No.SST4401T116
BrandROHM
HK$0.383
Each (In a Pack of 200)
units
NPN 600 mA 40 V SOT-23 Surface Mount 350 mW 20 Single 60 V 6 V - 3 1 -
RS Stock No. 826-8459
Mfr. Part No.2SD1949T106R
BrandROHM
HK$1.842
Each (In a Pack of 40)
units
NPN 500 mA 50 V SOT-323 (SC-70) Surface Mount 200 mW 120 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 183-4620
Mfr. Part No.BC848BT116
BrandROHM
HK$0.254
Each (On a Reel of 3000)
units
NPN 100 mA 30 V SOT-23 Surface Mount 350 mW 200 Single 30 V 5 V 100 MHz 3 1 -
RS Stock No. 177-6725
Mfr. Part No.UMT3906T106
BrandROHM
HK$0.50
Each (In a Pack of 100)
units
PNP 200 mA -40 V SOT-323 Surface Mount 200 mW 30 Single -40 V -5 V - 3 1 -
RS Stock No. 171-5401
Mfr. Part No.EMB59T2R
BrandROHM
HK$0.367
Each (On a Reel of 8000)
units
PNP 100 mA - SOT-563 Surface Mount 150 mW 80 - - - 250 MHz 6 2 -
RS Stock No. 604-8985
Mfr. Part No.2SD2097
BrandROHM
HK$3.79
Each (In a Pack of 25)
units
NPN 5 A 20 V ATV Through Hole 1 W 120 - 50 V 6 V 150 MHz 3 1 -
RS Stock No. 133-2947
Mfr. Part No.UMT2222AT106
BrandROHM
HK$0.611
Each (In a Pack of 100)
units
NPN 600 mA 40 V SOT-323 (SC-70) Surface Mount 200 mW 35 - 75 V 6 V - 3 1 -
RS Stock No. 146-6995
Mfr. Part No.2SCR554RTL
BrandROHM
HK$1.291
Each (On a Reel of 3000)
units
NPN 1.5 A 80 V SOT-346T (SC-96) Surface Mount 1 W 120 Single 80 V 6 V 300 MHz 3 1 -
RS Stock No. 168-2089
Mfr. Part No.DTC623TUT106
BrandROHM
HK$1.868
Each (In a Pack of 50)
units
NPN 600 mA 20 (Minimum) V SOT-323 Surface Mount 200 mW - Single 20 (Minimum) V 12 (Minimum) V 150 MHz 3 1 -
RS Stock No. 826-8566
Mfr. Part No.QSH29TR
BrandROHM
HK$4.759
Each (In a Pack of 15)
units
NPN - 60 V SC-95 Surface Mount 1.25 W 500 Isolated - 5 V - 6 2 -
RS Stock No. 826-8318
Mfr. Part No.2SA1576UBTLR
BrandROHM
HK$0.493
Each (In a Pack of 200)
units
PNP 150 mA 50 V SC-85 Surface Mount 200 mW 120 Single -60 V -6 V 100 MHz 3 1 -