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. 739-0401
Mfr. Part No.FJA13009TU
MYR6.356
Each (In a Pack of 5)
units
NPN 12 A 400 V TO-3P Through Hole 130 W 6 Single 700 V 9 V - 3 1 -
RS Stock No. 803-1134
Mfr. Part No.BC557ATA
MYR0.249
Each (In a Pack of 200)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS Stock No. 124-1316
Mfr. Part No.FJA13009TU
MYR5.098
Each (In a Tube of 30)
units
NPN 12 A 400 V TO-3P Through Hole 130 W 6 Single 700 V 9 V - 3 1 -
RS Stock No. 169-8619
Mfr. Part No.BC557ATA
MYR0.135
Each (On a Tape of 2000)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 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. 760-3117
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
MYR12.61
Each
units
PNP 15 A 230 V TO-3PL Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 686-8076
Mfr. Part No.BD139-10
MYR1.33
Each (In a Pack of 20)
units
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 63 Single 80 V 5 V - 3 1 -
RS Stock No. 102-4111
Mfr. Part No.BD139-10
MYR0.74
Each (In a Tube of 50)
units
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 63 Single 80 V 5 V - 3 1 -
RS Stock No. 168-7405
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
MYR9.28
Each (In a Tube of 100)
units
PNP 15 A 230 V TO-3PL Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 125-0067
Mfr. Part No.MJ21194G
MYR21.60
Each (In a Tray of 100)
units
NPN 16 A 250 V TO-204 Through Hole 250 W 25 Single 400 V 5 V 4 MHz 3 1 -
RS Stock No. 803-1061
Mfr. Part No.BC33725TFR
MYR0.243
Each (In a Pack of 200)
units
NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
RS Stock No. 178-7544
Mfr. Part No.BC33725TAR
MYR0.155
Each (In a Bag of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 803-1068
Mfr. Part No.BC33725TAR
MYR0.268
Each (In a Pack of 200)
units
NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
RS Stock No. 781-5269
Mfr. Part No.SMMBTA56LT3G
MYR0.377
Each (In a Pack of 50)
units
PNP 500 mA 80 V SOT-23 Surface Mount 225 mW 100 Single -80 V dc -4 V 100 MHz 3 1 AEC-Q101
RS Stock No. 169-8605
Mfr. Part No.BC33725TFR
MYR0.165
Each (On a Reel of 2000)
units
NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
RS Stock No. 124-1731
Mfr. Part No.BC33725TA
MYR0.196
Each (On a Reel of 2000)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -
RS Stock No. 163-0849
Mfr. Part No.2SC5707-TL-E
MYR1.13
Each (On a Reel of 700)
units
NPN 8 A 50 V TP-FA Surface Mount 15 W 200 Single 100 V 6 V 1 MHz 4 1 -
RS Stock No. 296-273
Mfr. Part No.MJ15004G
MYR26.50
Each
units
PNP 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
RS Stock No. 178-7614
Mfr. Part No.SMMBTA56LT1G
MYR0.258
Each (On a Reel of 3000)
units
PNP 500 mA 80 V SOT-23 Surface Mount 225 mW 100 Single -80 V dc -4 V 100 MHz 3 1 AEC-Q101
RS Stock No. 166-3239
Mfr. Part No.KSC2690AYS
MYR0.767
Each (In a Bag of 2000)
units
NPN 1.2 A 160 V TO-126 Through Hole 20 W 60 Single 160 V 5 V - 3 1 -
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