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. 178-7544
Mfr. Part No.BC33725TAR
MYR0.25
Each (In a Bag of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 774-0742
Mfr. Part No.2SC5707-TL-E
MYR2.568
Each (In a Pack of 5)
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. 803-1061
Mfr. Part No.BC33725TFR
MYR0.203
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. 145-5441
Mfr. Part No.FJP13009TU
MYR3.403
Each (In a Tube of 50)
units
NPN 12 A 400 V TO-220 Through Hole 100 W 6 Single 700 V 9 V 4 MHz 3 1 -
RS Stock No. 296-273
Mfr. Part No.MJ15004G
MYR27.52
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. 781-5250
Mfr. Part No.SMMBTA56LT1G
MYR0.97
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. 903-4305
Mfr. Part No.KSC2690AYS
MYR1.545
Each (In a Pack of 50)
units
NPN 1.2 A 160 V TO-126 Through Hole 20 W 60 Single 160 V 5 V - 3 1 -
RS Stock No. 756-0262
Mfr. Part No.2SC5199-O(Q)
BrandToshiba
MYR10.03
Each
units
NPN 12 A 160 V TO-3PL Through Hole 120 W 80 Single 160 V 5 V 30 MHz 3 1 -
RS Stock No. 806-4425
Mfr. Part No.KSA733CYTA
MYR0.231
Each (In a Pack of 200)
units
PNP 150 mA 50 V TO-92 Through Hole 250 mW 40 Single -60 V -5 V 1 MHz 3 1 -
RS Stock No. 671-1116
Mfr. Part No.BC33725TA
MYR0.949
Each (In a Pack of 10)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -
RS Stock No. 145-5582
Mfr. Part No.KSA733CYTA
MYR0.106
Each (On a Tape of 2000)
units
PNP 150 mA 50 V TO-92 Through Hole 250 mW 40 Single -60 V -5 V 1 MHz 3 1 -
RS Stock No. 178-4696
Mfr. Part No.SMMBTA56LT3G
MYR0.465
Each (On a Reel of 10000)
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. 803-1068
Mfr. Part No.BC33725TAR
MYR0.255
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. 145-4268
Mfr. Part No.NSM4002MR6T1G
MYR0.345
Each (On a Reel of 3000)
units
NPN 500 mA 40 V, 45 V SC-74 Surface Mount 260 mW 100 Complex 40 V, 45 V 5 V, 6 V 300 (Min.) MHz 6 2 -
RS Stock No. 124-1460
Mfr. Part No.2SC5200OTU
MYR9.728
Each (In a Tube of 25)
units
NPN 17 A 250 V TO-264 Through Hole 150 W 55 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 890-2645
Mfr. Part No.2SC3324-BL(TE85L,F
BrandToshiba
MYR0.639
Each (In a Pack of 25)
units
NPN 100 mA 120 V SOT-346 (SC-59) Surface Mount 150 mW 200 Single 120 V 120 V - 3 1 -
RS Stock No. 805-1104
Mfr. Part No.2N5551TA
MYR0.262
Each (In a Pack of 200)
units
NPN 600 mA 160 V TO-92 Through Hole 625 mW 80 Single 180 V 6 V 100 MHz 3 1 -
RS Stock No. 842-7936
Mfr. Part No.NSM4002MR6T1G
MYR0.50
Each (In a Pack of 100)
units
NPN 500 mA 40 V, 45 V SC-74 Surface Mount 260 mW 100 Complex 40 V, 45 V 5 V, 6 V 300 (Min.) MHz 6 2 -
RS Stock No. 669-7445
Mfr. Part No.ZDT6790TA
MYR6.84
Each (In a Pack of 5)
units
NPN + PNP 2 A 40 V, 45 V SM Surface Mount 2.75 W 150 Isolated 45 V 5 V 150 MHz 8 2 -
RS Stock No. 739-0423
Mfr. Part No.KSB772YSTU
MYR2.66
Each (In a Pack of 5)
units
PNP 3 A 30 V TO-126 Through Hole 10 W 30 Single -40 V -5 V 80 MHz 3 1 -
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