Bipolar Transistors

Bipolar Transistors are a solid state, three-pin devices made from three layers of silicon. A bipolar transistor 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

Bipolar transistors are constructed 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.

How do bipolar transistors work?

Bipolar transistors have 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.

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.

They are also available as;

  • Digital transistors - are made of a semiconductor material, usually silicon, which conducts the current (or electricity) with little resistance. They also tend to have at least three terminals for easy connection to an external circuit.
  • UJT transistors - constructed of a bar of lightly dope N type silicone with a small piece of heavily doped P type material attached to one side. Since the silicon bar is lightly dope it has very high resistance.

Applications of bipolar transistors?

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 Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Dimensions Minimum Operating Temperature
RS Stock No. 445-2219
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
$0.537
Each (In a Pack of 10)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW Single 20 V 2.5 V 5000 MHz 3 1 1 x 2.9 x 1.3mm -65 °C
RS Stock No. 166-0863
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
$0.134
Each (On a Reel of 3000)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW Single 20 V 2.5 V 5000 MHz 3 1 1 x 2.9 x 1.3mm -
RS Stock No. 165-5621
Mfr. Part No.BFR193WH6327XTSA1
BrandInfineon
$0.14
Each (On a Reel of 3000)
units
NPN 80 mA 12 V SOT-323 (SC-70) Surface Mount 580 mW Single 20 V 2 V 8 GHz 3 1 2 x 1.25 x 0.8mm -
RS Stock No. 826-9364
Mfr. Part No.BFR193WH6327XTSA1
BrandInfineon
$0.183
Each (In a Pack of 100)
units
NPN 80 mA 12 V SOT-323 (SC-70) Surface Mount 580 mW Single 20 V 2 V 8 GHz 3 1 2 x 1.25 x 0.8mm -
RS Stock No. 145-9490
Mfr. Part No.BFR93AWH6327XTSA1
BrandInfineon
$0.164
Each (On a Reel of 3000)
units
NPN 90 mA 20 V SOT-23 Surface Mount 300 mW Single 20 V 2 V 6 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 827-0140
Mfr. Part No.BFR93AWH6327XTSA1
BrandInfineon
$0.263
Each (On a Reel of 250)
units
NPN 90 mA 20 V SOT-23 Surface Mount 300 mW Single 20 V 2 V 6 GHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 823-5538
Mfr. Part No.BFR193E6327HTSA1
BrandInfineon
$0.691
Each (In a Pack of 25)
units
NPN 80 mA 12 V SOT-23 Surface Mount 580 mW Single 20 V 2 V 8 GHz 3 1 2.9 x 1.3 x 1mm 0 °C
RS Stock No. 911-4717
Mfr. Part No.BFR35APE6327HTSA1
BrandInfineon
$0.183
Each (On a Reel of 3000)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW Single 20 V 2.5 V 5 GHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 892-2324
Mfr. Part No.BFR106E6327HTSA1
BrandInfineon
$0.476
Each (In a Pack of 50)
units
NPN 210 mA 16 V SOT-23 Surface Mount 700 mW Single 20 V 3 V 5 GHz 3 - 2.9 x 1.3 x 1mm -
RS Stock No. 892-2254
Mfr. Part No.BFR340FH6327XTSA1
BrandInfineon
$0.493
Each (In a Pack of 50)
units
NPN 20 mA 6 V TSFP Surface Mount 75 mW Single 15 V 2 V 14 GHz 3 - 1.2 x 0.8 x 0.55mm -
RS Stock No. 165-7449
Mfr. Part No.BFR181E6327HTSA1
BrandInfineon
$0.169
Each (On a Reel of 3000)
units
NPN 20 mA 12 V SOT-23 Surface Mount 175 mW Single 20 V 2 V - 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 165-8250
Mfr. Part No.BFR340FH6327XTSA1
BrandInfineon
$0.152
Each (On a Reel of 3000)
units
NPN 20 mA 6 V TSFP Surface Mount 75 mW Single 15 V 2 V 14 GHz 3 - 1.2 x 0.8 x 0.55mm -
RS Stock No. 892-2365
Mfr. Part No.BFR93AE6327HTSA1
BrandInfineon
$0.268
Each (In a Pack of 100)
units
NPN 90 mA 12 V SOT-23 Surface Mount 300 mW Single 20 V 2 V 6 GHz 3 - 2.9 x 1.3 x 1mm -
RS Stock No. 752-8136
Mfr. Part No.BFR181E6327HTSA1
BrandInfineon
$0.661
Each (On a Tape of 10)
units
NPN 20 mA 12 V SOT-23 Surface Mount 175 mW Single 20 V 2 V - 3 1 2.9 x 1.3 x 0.9mm -65 °C
RS Stock No. 165-8254
Mfr. Part No.BFR106E6327HTSA1
BrandInfineon
$0.164
Each (On a Reel of 3000)
units
NPN 210 mA 16 V SOT-23 Surface Mount 700 mW Single 20 V 3 V 5 GHz 3 - 2.9 x 1.3 x 1mm -
RS Stock No. 752-7962
Mfr. Part No.BCM846SH6327XTSA1
BrandInfineon
$0.147
Each (In a Pack of 50)
units
NPN 100 mA 65 V SOT-363 (SC-88) Surface Mount 250 mW Isolated 80 V 6 V 250 MHz 6 2 2 x 1.25 x 0.8mm -
RS Stock No. 826-8992
Mfr. Part No.BFP840ESDH6327XTSA1
BrandInfineon
$0.612
Each (In a Pack of 50)
units
NPN 35 mA 2.25 V SOT-343 Surface Mount 75 mW Single 2.9 V - 80 GHz 4 1 2 x 1.25 x 0.8mm -
RS Stock No. 445-2203
Mfr. Part No.BFR35APE6327HTSA1
BrandInfineon
$0.626
Each (In a Pack of 5)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW Single 20 V 2.5 V 5000 MHz 3 1 1 x 2.9 x 1.3mm -65 °C
RS Stock No. 145-8795
Mfr. Part No.BCM846SH6327XTSA1
BrandInfineon
$0.091
Each (On a Reel of 3000)
units
NPN 100 mA 65 V SOT-363 (SC-88) Surface Mount 250 mW Isolated 80 V 6 V 250 MHz 6 2 2 x 1.25 x 0.8mm -
RS Stock No. 445-2039
Mfr. Part No.BC848CE6327HTSA1
BrandInfineon
$0.097
Each (In a Pack of 50)
units
NPN 100 mA 30 V SOT-23 Surface Mount 330 mW Single 30 V 6 V 250 MHz 3 1 1 x 2.9 x 1.3mm -65 °C