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. 751-4329
Mfr. Part No.DZT5551-13
SGD0.391
Each (In a Pack of 25)
units
NPN 600 mA 160 V SOT-223 Surface Mount 1 W 50 Single 180 V 6 V 300 MHz 3 + Tab 1 -
RS Stock No. 145-2798
Mfr. Part No.BC560CG
SGD0.055
Each (In a Bag of 5000)
units
PNP 100 mA 45 V TO-92 Through Hole 625 mW 100 Single 50 V 5 V 250 MHz 3 1 -
RS Stock No. 112-5453
Mfr. Part No.BCP56,115
BrandNexperia
SGD0.164
Each (In a Pack of 5)
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NPN 1 A 80 V SOT-223 (SC-73) Surface Mount 960 mW 40 Single 100 V 5 V 180 MHz 4 1 -
RS Stock No. 548-4431
Mfr. Part No.2SC1623-A
SGD0.21
Each
units
NPN 100 mA 50 V MiniMold Surface Mount 200 mW - Single 60 V 5 V 250 MHz 3 1 -
RS Stock No. 145-4605
Mfr. Part No.FJP5555TU
SGD0.882
Each (In a Tube of 50)
units
NPN 5 A 400 V TO-220 Through Hole 75 W 10 Single 1050 V 14 V - 3 1 -
RS Stock No. 823-1435
Mfr. Part No.LMN200B02-7
SGD0.194
Each (In a Pack of 25)
units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW 250 N+P Loadswitch -50 V -5 V 200 MHz 6 2 -
RS Stock No. 671-1113
Mfr. Part No.BC547BTA
SGD0.289
Each (In a Pack of 25)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
RS Stock No. 169-8610
Mfr. Part No.BC547BTF
SGD0.045
Each (On a Reel of 2000)
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. 178-7546
Mfr. Part No.2N4403TFR
SGD0.109
Each (On a Reel of 2000)
units
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RS Stock No. 146-2074
Mfr. Part No.PN2222ABU
SGD0.048
Each (In a Bag of 10000)
units
NPN 1 A 40 V TO-92 Through Hole 625 mW 35 Single 75 V 6 V 300 MHz 3 1 -
RS Stock No. 295-539
Mfr. Part No.ZTX753
SGD1.262
Each (In a Pack of 5)
units
PNP 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 140 MHz 3 1 -
RS Stock No. 922-7740
Mfr. Part No.ZTX753
SGD0.657
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. 805-1084
Mfr. Part No.2N4403TFR
SGD0.071
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. 739-0313
Mfr. Part No.SS8050CBU
SGD0.191
Each (In a Pack of 10)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS Stock No. 314-1817
Mfr. Part No.BD140
SGD0.88
Each
units
PNP 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS Stock No. 807-0896
Mfr. Part No.FJP5555TU
SGD1.439
Each (In a Pack of 10)
units
NPN 5 A 400 V TO-220 Through Hole 75 W 10 Single 1050 V 14 V - 3 1 -
RS Stock No. 805-1075
Mfr. Part No.2N4403TAR
SGD0.12
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. 169-7397
Mfr. Part No.LMN200B02-7
SGD0.248
Each (On a Reel of 3000)
units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW 250 N+P Loadswitch -50 V -5 V 200 MHz 6 2 -
RS Stock No. 124-1730
Mfr. Part No.BC547BTA
SGD0.048
Each (On a Reel of 2000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 200 Single 50 V 6 V 300 MHz 3 1 -
RS Stock No. 178-7545
Mfr. Part No.2N4403TAR
SGD0.105
Each (In a Bag of 2000)
units
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