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. 170-4162
Mfr. Part No.BC548C A1
MYR0.117
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 420 Single 30 V 6 V - 3 1 -
RS Stock No. 796-9717
Mfr. Part No.BC548C A1
MYR0.262
Each (In a Pack of 250)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 420 Single 30 V 6 V - 3 1 -
RS Stock No. 146-2333
Mfr. Part No.BC548B A1
MYR0.095
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 200 Single 30 V 6 V - 3 1 -
RS Stock No. 796-9713
Mfr. Part No.BC548B A1
MYR0.152
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. 170-4161
Mfr. Part No.BC548A A1
MYR0.117
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 6 V - 3 1 -
RS Stock No. 796-9710
Mfr. Part No.BC548A A1
MYR0.188
Each (In a Pack of 250)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 6 V - 3 1 -
RS Stock No. 796-9690
Mfr. Part No.BC546B A1
MYR0.188
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. 170-4155
Mfr. Part No.BC546B A1
MYR0.117
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. 796-9697
Mfr. Part No.BC546A A1
MYR0.179
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. 796-9701
Mfr. Part No.BC547C A1
MYR0.195
Each (In a Pack of 250)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 420 Single 50 V 6 V - 3 1 -
RS Stock No. 796-9684
Mfr. Part No.BC338-25 A1
MYR0.161
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. 170-4158
Mfr. Part No.BC547C A1
MYR0.117
Each (On a Tape of 4000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 420 Single 50 V 6 V - 3 1 -
RS Stock No. 146-2331
Mfr. Part No.BC338-25 A1
MYR0.095
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. 170-4156
Mfr. Part No.BC546A A1
MYR0.117
Each (On a Tape of 4000)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 110 Single 80 V 6 V - 3 1 -
RS Stock No. 796-9729
Mfr. Part No.BC549B A1
MYR0.162
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. 170-4166
Mfr. Part No.BC549B A1
MYR0.106
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW 200 Single 30 V 6 V - 3 1 -
RS Stock No. 748-4997
Mfr. Part No.BC817-25 RF
MYR0.206
Each (In a Pack of 100)
units
NPN 500 mA 45 V SOT-23 Surface Mount 300 mW 40 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 796-9767
Mfr. Part No.BC817-40 RFG
MYR0.199
Each (In a Pack of 250)
units
NPN 500 mA 45 V SOT-23 Surface Mount 300 mW 100 Single 50 V 5 V - 3 1 -
RS Stock No. 177-5875
Mfr. Part No.TSA884CX RFG
MYR1.161
Each (On a Reel of 3000)
units
PNP 150 mA 500 V SOT-23 Surface Mount 300 mW 80 Single -500 V -5 V 1 MHz 3 1 -
RS Stock No. 170-4175
Mfr. Part No.BC817-25W RF
MYR0.133
Each (On a Reel of 3000)
units
NPN 500 mA 45 V SOT-323 (SC-70) Surface Mount 200 mW 160 Single 50 V 5 V - 3 1 -