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. 121-6418
Mfr. Part No.MJL1302AG
$4.87
Each (In a Tube of 25)
units
PNP 15 A 260 V TO-264 Through Hole 200 W 45 Single 260 V dc 5 V 1 MHz 3 1 -
RS Stock No. 806-2731
Mfr. Part No.KSA1142OSTU
$0.599
Each (In a Tube of 60)
units
PNP 100 mA 180 V TO-126 Through Hole 8 W 100 Single -180 V -5 V 1 MHz 3 1 -
RS Stock No. 170-8054
Mfr. Part No.PMBTA42,235
BrandNexperia
$0.054
Each (On a Reel of 10000)
units
NPN 100 mA 300 V TO-236 Surface Mount 250 mW 25 Single 300 V 6 V - 3 1 AEC-Q101
RS Stock No. 163-0035
Mfr. Part No.MJ15001G
$7.76
Each (In a Tray of 100)
units
NPN 15 A 140 V TO-204AA Through Hole 200 W 25 Single 140 V 5 V - 2 1 -
RS Stock No. 806-1319
Mfr. Part No.PN2907ATF
$0.108
Each (In a Pack of 200)
units
PNP 800 mA 60 V TO-92 Through Hole 625 mW 100 Single -60 V -5 V 100 MHz 3 1 -
RS Stock No. 652-9591
Mfr. Part No.PMBTA42,185
BrandNexperia
$0.342
Each (In a Pack of 50)
units
NPN 100 mA 300 V SOT-23 (TO-236AB) Surface Mount 250 mW 25 Single 300 V 6 V 50 MHz 3 1 -
RS Stock No. 166-2988
Mfr. Part No.BC547B
$0.10
Each (In a Bag of 10000)
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. 122-0070
Mfr. Part No.MJ15004G
$7.82
Each (In a Tray of 100)
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. 738-7584
Mfr. Part No.2N2907ACSM
BrandSemelab
$32.27
Each
units
PNP 600 mA 60 V LCC 1 Surface Mount 500 mW 75 Single -60 V -5 V - 3 1 -
RS Stock No. 163-1178
Mfr. Part No.SMMBT6521LT1G
$0.292
Each (On a Reel of 3000)
units
NPN 100 mA 25 V SOT-23 Surface Mount 225 mW 150 Single 40 V dc 4 V 1 MHz 3 1 AEC-Q101
RS Stock No. 803-1083
Mfr. Part No.BC547BBU
$0.094
Each (In a Pack of 200)
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. 166-3291
Mfr. Part No.KSA1220AYS
$0.338
Each (In a Bag of 2000)
units
PNP 1.2 A 160 V TO-126 Through Hole 20 W 60 Single -160 V -5 V 1 MHz 3 1 -
RS Stock No. 145-5501
Mfr. Part No.PN2907ATF
$0.06
Each (On a Reel of 2000)
units
PNP 800 mA 60 V TO-92 Through Hole 625 mW 100 Single -60 V -5 V 100 MHz 3 1 -
RS Stock No. 166-2723
Mfr. Part No.BC33725BU
$0.068
Each (In a Bag of 10000)
units
NPN 800 mA 50 V TO-92 Through Hole 625 mW 60 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 781-5240
Mfr. Part No.SMMBT6521LT1G
$0.666
Each (In a Pack of 20)
units
NPN 100 mA 25 V SOT-23 Surface Mount 225 mW 150 Single 40 V dc 4 V 1 MHz 3 1 AEC-Q101
RS Stock No. 122-0085
Mfr. Part No.2N3773G
$7.72
Each (In a Tray of 100)
units
NPN 16 A 140 V TO-204 Through Hole 150 W 5 Single 160 V 7 V - 3 1 -
RS Stock No. 903-4305
Mfr. Part No.KSC2690AYS
$0.735
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. 170-4152
Mfr. Part No.BC337-25 A1
$0.066
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. 711-5128
Mfr. Part No.ZXTN07045EFFTA
$0.795
Each (In a Pack of 10)
units
NPN 4 A 45 V SOT-23F Surface Mount 2 W 70 Single 45 V 7 V 190 MHz 3 1 -
RS Stock No. 761-3943
Mfr. Part No.BC33725BU
$0.147
Each (In a Pack of 100)
units
NPN 800 mA 50 V TO-92 Through Hole 625 mW 60 Single 50 V 5 V 100 MHz 3 1 -
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