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. 287-667
Mfr. Part No.BCR112E6327HTSA1
BrandInfineon
£0.161
Each (In a Pack of 10)
Units
NPN - 50 V SOT-23 Surface Mount - Single - - - 3 1 2.9 x 1.3 x 1mm -
RS Stock No. 911-4757
Mfr. Part No.BCR112E6327HTSA1
BrandInfineon
£0.028
Each (On a Reel of 3000)
Units
NPN - 50 V SOT-23 Surface Mount 200 mW Single - 10 V - 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 445-2023
Mfr. Part No.BC847CE6327HTSA1
BrandInfineon
£0.14
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 -
RS Stock No. 911-4701
Mfr. Part No.BC857BE6327HTSA1
BrandInfineon
£0.03
Each (On a Reel of 3000)
Units
PNP 100 mA 45 V SOT-23 Surface Mount 250 mW Single -50 V -5 V - 3 1 3 x 1.4 x 1.2mm -
RS Stock No. 445-2051
Mfr. Part No.BC857BE6327HTSA1
BrandInfineon
£0.049
Each (In a Pack of 50)
Units
PNP 100 mA 45 V SOT-23 Surface Mount 330 mW Single 50 V 5 V 250 MHz 3 1 1 x 2.9 x 1.3mm -
RS Stock No. 166-0863
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
£0.064
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. 445-2219
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
£0.264
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 -
RS Stock No. 445-2039
Mfr. Part No.BC848CE6327HTSA1
BrandInfineon
£0.044
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 -
RS Stock No. 166-1098
Mfr. Part No.BCV62AE6327HTSA1
BrandInfineon
£0.071
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 1 x 2.9 x 1.3mm -
RS Stock No. 146-771
Mfr. Part No.BCV62AE6327HTSA1
BrandInfineon
£0.098
Each (In a Pack of 50)
Units
PNP 100 mA 30 V SOT-143 Surface Mount 300 mW Current Mirror 30 V 6 V 250 MHz 4 2 1 x 2.9 x 1.3mm -
RS Stock No. 825-9294
Mfr. Part No.SMBT2222AE6327HTSA1
BrandInfineon
£0.057
Each (In a Pack of 200)
Units
NPN 600 mA 40 V SOT-23 Surface Mount 330 mW Single 75 V 6 V 300 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 145-8821
Mfr. Part No.SMBT2222AE6327HTSA1
BrandInfineon
£0.031
Each (On a Reel of 3000)
Units
NPN 600 mA 40 V SOT-23 Surface Mount 330 mW Single 75 V 6 V 300 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 857-8453
Mfr. Part No.BFP420H6801XTSA1
BrandInfineon
£0.15
Each (On a Reel of 3000)
Units
NPN 60 mA 4.5 V SOT-343 Surface Mount 210 mW Single 15 V 1.5 V 25 GHz 4 1 2 x 1.25 x 0.8mm -
RS Stock No. 857-8450
Mfr. Part No.BFP420H6740XTSA1
BrandInfineon
£0.127
Each (On a Reel of 3000)
Units
NPN 60 mA 4.5 V SOT-343 Surface Mount 210 mW Single 15 V 1.5 V 25 GHz 4 1 2 x 1.25 x 0.8mm -
RS Stock No. 826-8960
Mfr. Part No.BFP420H6327XTSA1
BrandInfineon
£0.282
Each (In a Pack of 50)
Units
NPN 60 mA 15 V SOT-343 Surface Mount 210 mW Single 15 V 1.5 V 25 GHz 4 1 2 x 1.25 x 0.8mm -
RS Stock No. 827-5154
Mfr. Part No.BFP640ESDH6327XTSA1
BrandInfineon
£0.398
Each (In a Pack of 25)
Units
NPN 50 mA 4.1 V SOT-343 Surface Mount 200 mW Single 4.8 V 0.5 V 45 GHz 4 1 2 x 1.25 x 0.9mm -
RS Stock No. 145-8845
Mfr. Part No.BFP640ESDH6327XTSA1
BrandInfineon
£0.163
Each (On a Reel of 3000)
Units
NPN 50 mA 4.1 V SOT-343 Surface Mount 200 mW Single 4.8 V 0.5 V 45 GHz 4 1 2 x 1.25 x 0.9mm -
RS Stock No. 825-9339
Mfr. Part No.BCX41E6327HTSA1
BrandInfineon
£0.12
Each (In a Pack of 100)
Units
NPN 800 mA 125 V SOT-23 Surface Mount 330 mW Single 125 V 5 V 100 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 165-5925
Mfr. Part No.BCX41E6327HTSA1
BrandInfineon
£0.074
Each (On a Reel of 3000)
Units
NPN 800 mA 125 V SOT-23 Surface Mount 330 mW Single 125 V 5 V 100 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 165-7536
Mfr. Part No.BC856SH6327XTSA1
BrandInfineon
£0.03
Each (On a Reel of 3000)
Units
PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 250 mW Isolated 80 V 5 V 250 MHz 6 2 2 x 1.25 x 0.8mm -