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. 892-2254
Mfr. Part No.BFR340FH6327XTSA1
BrandInfineon
$0.466
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. 165-8250
Mfr. Part No.BFR340FH6327XTSA1
BrandInfineon
$0.147
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. 892-2119
Mfr. Part No.BFP196WH6327XTSA1
BrandInfineon
$0.469
Each (In a Pack of 30)
units
NPN 150 mA 12 V SOT-343 Surface Mount 700 mW Single 20 V 2 V 7.5 GHz 4 - 2 x 1.25 x 0.9mm -
RS Stock No. 165-5559
Mfr. Part No.BFP196WH6327XTSA1
BrandInfineon
$0.122
Each (On a Reel of 3000)
units
NPN 150 mA 12 V SOT-343 Surface Mount 700 mW Single 20 V 2 V 7.5 GHz 4 - 2 x 1.25 x 0.9mm -
RS Stock No. 166-0846
Mfr. Part No.BFQ19SH6327XTSA1
BrandInfineon
$0.393
Each (On a Reel of 1000)
units
NPN 75 mA 15 V SOT-89 Surface Mount 1 W Single 20 V 3 V 1.5 GHz 3 1 1.5 x 4.5 x 2.5mm -
RS Stock No. 288-339
Mfr. Part No.BFQ19SH6327XTSA1
BrandInfineon
$1.18
Each
units
NPN 75 mA 15 V SOT-89 Surface Mount 1 W Single 20 V 3 V 1.5 GHz 3 1 1.5 x 4.5 x 2.5mm -65 °C
RS Stock No. 827-0099
Mfr. Part No.BCV62CE6327HTSA1
BrandInfineon
$0.195
Each (On a Reel of 250)
units
PNP 100 mA 30 V SOT-143 Surface Mount 300 mW Current Mirror 30 V 6 V 250 MHz 4 2 2.9 x 1.3 x 0.9mm -
RS Stock No. 178-7401
Mfr. Part No.BFP196E6327HTSA1
BrandInfineon
$0.136
Each (On a Reel of 3000)
units
NPN 150 mA 12 V SOT-143 Surface Mount 700 mW Single 20 V 2 V 7.5 GHz 4 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 165-5870
Mfr. Part No.BCV62CE6327HTSA1
BrandInfineon
$0.131
Each (On a Reel of 3000)
units
PNP 100 mA 30 V SOT-143 Surface Mount 300 mW Current Mirror 30 V 6 V 250 MHz 4 2 2.9 x 1.3 x 1mm -
RS Stock No. 826-9478
Mfr. Part No.BFP196E6327HTSA1
BrandInfineon
$0.416
Each (In a Pack of 50)
units
NPN 150 mA 12 V SOT-143 Surface Mount 700 mW Single 20 V 2 V 7.5 GHz 4 1 2.9 x 1.3 x 0.9mm -65 °C
RS Stock No. 826-9367
Mfr. Part No.BFP182WH6327XTSA1
BrandInfineon
$0.22
Each (In a Pack of 100)
units
NPN 35 mA 12 V SOT-343 Surface Mount 250 mW Single 20 V 2 V 8 GHz 4 1 2 x 1.25 x 0.8mm -
RS Stock No. 165-5622
Mfr. Part No.BFP182WH6327XTSA1
BrandInfineon
$0.13
Each (On a Reel of 3000)
units
NPN 35 mA 12 V SOT-343 Surface Mount 250 mW Single 20 V 2 V 8 GHz 4 1 2 x 1.25 x 0.8mm -
RS Stock No. 445-2039
Mfr. Part No.BC848CE6327HTSA1
BrandInfineon
$0.195
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
RS Stock No. 166-1107
Mfr. Part No.BFP183WH6327XTSA1
BrandInfineon
$0.181
Each (On a Reel of 3000)
units
NPN 65 mA 12 V SOT-343 Surface Mount 450 mW Single 20 V 2 V 8000 MHz 4 1 0.9 x 2 x 1.25mm -
RS Stock No. 892-2302
Mfr. Part No.BFR360FH6327XTSA1
BrandInfineon
$0.413
Each (In a Pack of 50)
units
NPN 35 mA 6 V TSFP Surface Mount 210 mW Single 15 V 2 V 14 GHz 3 - 1.2 x 0.8 x 0.55mm -
RS Stock No. 167-964
Mfr. Part No.BFP183WH6327XTSA1
BrandInfineon
$0.556
Each (In a Pack of 50)
units
NPN 65 mA 12 V SOT-343 Surface Mount 450 mW Single 20 V 2 V 8000 MHz 4 1 0.9 x 2 x 1.25mm -65 °C
RS Stock No. 445-2023
Mfr. Part No.BC847CE6327HTSA1
BrandInfineon
$0.328
Each (In a Pack of 50)
units
NPN 100 mA 45 V SOT-23 Surface Mount 330 mW Single 50 V 6 V 250 MHz 3 1 1 x 2.9 x 1.3mm -65 °C
RS Stock No. 165-8253
Mfr. Part No.BFR360FH6327XTSA1
BrandInfineon
$0.131
Each (On a Reel of 3000)
units
NPN 35 mA 6 V TSFP Surface Mount 210 mW Single 15 V 2 V 14 GHz 3 - 1.2 x 0.8 x 0.55mm -
RS Stock No. 823-5538
Mfr. Part No.BFR193E6327HTSA1
BrandInfineon
$0.644
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. 165-8077
Mfr. Part No.BFP720H6327XTSA1
BrandInfineon
$0.284
Each (On a Reel of 3000)
units
NPN 25 mA 13 V SOT-343 Surface Mount 100 mW Single 13 V 1.2 V - 4 1 2 x 1.25 x 0.9mm -