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. 796-9684
Mfr. Part No.BC338-25 A1
HK$1.235
Each (In a Pack of 250)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW 160 Single 30 V 5 V - 3 1 -
RS Stock No. 146-2331
Mfr. Part No.BC338-25 A1
HK$0.317
Each (On a Tape of 4000)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW 160 Single 30 V 5 V - 3 1 -
RS Stock No. 796-9681
Mfr. Part No.BC338-16 A1
HK$1.15
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. 796-9690
Mfr. Part No.BC546B A1
HK$0.988
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. 170-4153
Mfr. Part No.BC338-16 A1
HK$0.344
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. 170-4155
Mfr. Part No.BC546B A1
HK$0.30
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. 170-4150
Mfr. Part No.BC337-40 A1
HK$0.317
Each (On a Tape of 4000)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 250 Single 50 V 5 V - 3 1 -
RS Stock No. 796-9672
Mfr. Part No.BC337-40 A1
HK$1.15
Each (In a Pack of 250)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 250 Single 50 V 5 V - 3 1 -
RS Stock No. 796-9694
Mfr. Part No.BC546C A1
HK$1.284
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. 146-2332
Mfr. Part No.BC546C A1
HK$0.293
Each (On a Tape of 4000)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 420 Single 80 V 6 V - 3 1 -
RS Stock No. 748-4991
Mfr. Part No.BC847B RF
HK$0.48
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. 169-9291
Mfr. Part No.BC847B RF
HK$0.252
Each (On a Reel of 3000)
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. 796-9688
Mfr. Part No.BC338-40 A1
HK$1.339
Each (In a Pack of 250)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW 250 Single 30 V 5 V - 3 1 -
RS Stock No. 170-4152
Mfr. Part No.BC337-25 A1
HK$0.317
Each (On a Tape of 4000)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 160 Single 50 V 5 V - 3 1 -
RS Stock No. 796-9678
Mfr. Part No.BC337-25 A1
HK$1.15
Each (In a Pack of 250)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 160 Single 50 V 5 V - 3 1 -
RS Stock No. 170-4154
Mfr. Part No.BC338-40 A1
HK$0.344
Each (On a Tape of 4000)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW 250 Single 30 V 5 V - 3 1 -
RS Stock No. 796-9697
Mfr. Part No.BC546A A1
HK$1.164
Each (In a Pack of 250)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 110 Single 80 V 6 V - 3 1 -
RS Stock No. 796-9713
Mfr. Part No.BC548B A1
HK$0.988
Each (In a Pack of 250)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 200 Single 30 V 6 V - 3 1 -
RS Stock No. 796-9757
Mfr. Part No.BC807-40W RF
HK$0.325
Each (In a Pack of 250)
units
PNP 500 mA 45 V SOT-323 (SC-70) Surface Mount 200 mW 250 Single 50 V 5 V - 3 1 -
RS Stock No. 901-4109
Mfr. Part No.TSD2150ACY RMG
HK$1.556
Each (In a Pack of 50)
units
NPN 3 A 50 V SOT-89 Surface Mount 600 mW 150 Single 80 V 6 V 100 MHz 3 1 -