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. 166-0863
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
$0.138
Each (On a Reel of 3000)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW 70 Single 20 V 2.5 V 5000 MHz 3 1 -
RS Stock No. 445-2219
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
$0.38
Each (In a Pack of 10)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW 70 Single 20 V 2.5 V 5000 MHz 3 1 -
RS Stock No. 826-9364
Mfr. Part No.BFR193WH6327XTSA1
BrandInfineon
$0.201
Each (In a Pack of 100)
units
NPN 80 mA 12 V SOT-323 (SC-70) Surface Mount 580 mW 70 Single 20 V 2 V 8 GHz 3 1 -
RS Stock No. 165-5621
Mfr. Part No.BFR193WH6327XTSA1
BrandInfineon
$0.132
Each (On a Reel of 3000)
units
NPN 80 mA 12 V SOT-323 (SC-70) Surface Mount 580 mW 70 Single 20 V 2 V 8 GHz 3 1 -
RS Stock No. 823-5538
Mfr. Part No.BFR193E6327HTSA1
BrandInfineon
$0.279
Each (In a Pack of 25)
units
NPN 80 mA 12 V SOT-23 Surface Mount 580 mW 70 Single 20 V 2 V 8 GHz 3 1 -
RS Stock No. 445-2225
Mfr. Part No.BFR93AE6327HTSA1
BrandInfineon
$0.30
Each (In a Pack of 10)
units
NPN 90 mA 12 V SOT-23 Surface Mount 300 mW 70 Single 20 V 2 V 6000 MHz 3 1 -
RS Stock No. 827-0140
Mfr. Part No.BFR93AWH6327XTSA1
BrandInfineon
$0.183
Each (On a Reel of 250)
units
NPN 90 mA 20 V SOT-23 Surface Mount 300 mW 70 Single 20 V 2 V 6 GHz 3 1 -
RS Stock No. 145-9490
Mfr. Part No.BFR93AWH6327XTSA1
BrandInfineon
$0.113
Each (On a Reel of 3000)
units
NPN 90 mA 20 V SOT-23 Surface Mount 300 mW 70 Single 20 V 2 V 6 MHz 3 1 -
RS Stock No. 892-2365
Mfr. Part No.BFR93AE6327HTSA1
BrandInfineon
$0.229
Each (In a Pack of 100)
units
NPN 90 mA 12 V SOT-23 Surface Mount 300 mW 70 Single 20 V 2 V 6 GHz 3 - -
RS Stock No. 752-7962
Mfr. Part No.BCM846SH6327XTSA1
BrandInfineon
$0.092
Each (In a Pack of 50)
units
NPN 100 mA 65 V SOT-363 (SC-88) Surface Mount 250 mW 200 Isolated 80 V 6 V 250 MHz 6 2 -
RS Stock No. 826-8992
Mfr. Part No.BFP840ESDH6327XTSA1
BrandInfineon
$0.404
Each (In a Pack of 50)
units
NPN 35 mA 2.25 V SOT-343 Surface Mount 75 mW 150 Single 2.9 V - 80 GHz 4 1 -
RS Stock No. 752-8136
Mfr. Part No.BFR181E6327HTSA1
BrandInfineon
$0.25
Each (On a Tape of 10)
units
NPN 20 mA 12 V SOT-23 Surface Mount 175 mW 70 Single 20 V 2 V - 3 1 -
RS Stock No. 892-2254
Mfr. Part No.BFR340FH6327XTSA1
BrandInfineon
$0.434
Each (In a Pack of 50)
units
NPN 20 mA 6 V TSFP Surface Mount 75 mW 90 Single 15 V 2 V 14 GHz 3 - -
RS Stock No. 892-2324
Mfr. Part No.BFR106E6327HTSA1
BrandInfineon
$0.44
Each (In a Pack of 50)
units
NPN 210 mA 16 V SOT-23 Surface Mount 700 mW 70 Single 20 V 3 V 5 GHz 3 - -
RS Stock No. 165-8250
Mfr. Part No.BFR340FH6327XTSA1
BrandInfineon
$0.153
Each (On a Reel of 3000)
units
NPN 20 mA 6 V TSFP Surface Mount 75 mW 90 Single 15 V 2 V 14 GHz 3 - -
RS Stock No. 445-2039
Mfr. Part No.BC848CE6327HTSA1
BrandInfineon
$0.035
Each (In a Pack of 50)
units
NPN 100 mA 30 V SOT-23 Surface Mount 330 mW 420 Single 30 V 6 V 250 MHz 3 1 -
RS Stock No. 145-8795
Mfr. Part No.BCM846SH6327XTSA1
BrandInfineon
$0.082
Each (On a Reel of 3000)
units
NPN 100 mA 65 V SOT-363 (SC-88) Surface Mount 250 mW 200 Isolated 80 V 6 V 250 MHz 6 2 -
RS Stock No. 165-5849
Mfr. Part No.BFP840ESDH6327XTSA1
BrandInfineon
$0.405
Each (On a Reel of 3000)
units
NPN 35 mA 2.25 V SOT-343 Surface Mount 75 mW 150 Single 2.9 V - 80 GHz 4 1 -
RS Stock No. 165-7449
Mfr. Part No.BFR181E6327HTSA1
BrandInfineon
$0.189
Each (On a Reel of 3000)
units
NPN 20 mA 12 V SOT-23 Surface Mount 175 mW 70 Single 20 V 2 V - 3 1 -
RS Stock No. 165-8254
Mfr. Part No.BFR106E6327HTSA1
BrandInfineon
$0.165
Each (On a Reel of 3000)
units
NPN 210 mA 16 V SOT-23 Surface Mount 700 mW 70 Single 20 V 3 V 5 GHz 3 - -