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. 162-9265
Mfr. Part No.SMUN5235T1G
€0.042
Each (On a Reel of 3000)
units
NPN - 50 V SOT-323 (SC-70) Surface Mount 310 mW Single - - - 3 1 2.2 x 1.35 x 0.9mm -
RS Stock No. 805-4478
Mfr. Part No.SMUN5235T1G
€0.076
Each (On a Tape of 100)
units
NPN - 50 V SOT-323 (SC-70) Surface Mount 310 mW Single - - - 3 1 2.2 x 1.35 x 0.9mm -
RS Stock No. 803-1087
Mfr. Part No.BC547BTF
€0.061
Each (In a Pack of 200)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V 1 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 124-1730
Mfr. Part No.BC547BTA
€0.026
Each (On a Reel of 2000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V 300 MHz 3 1 5.33 x 5.2 x 4.19mm -
RS Stock No. 169-8610
Mfr. Part No.BC547BTF
€0.033
Each (On a Reel of 2000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V 1 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 671-1113
Mfr. Part No.BC547BTA
€0.121
Each (In a Pack of 25)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V 300 MHz 3 1 5.33 x 5.2 x 4.19mm -
RS Stock No. 739-0385
Mfr. Part No.KSP2222ABU
€0.147
Each (In a Pack of 10)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW Single 75 V 6 V - 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 124-1315
Mfr. Part No.KSP2222ABU
€0.042
Each (In a Bag of 1000)
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NPN 600 mA 40 V TO-92 Through Hole 625 mW Single 75 V 6 V - 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 806-4475
Mfr. Part No.KSC1845FTA
€0.069
Each (In a Pack of 200)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW Single 120 V 5 V 110 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 166-3785
Mfr. Part No.KSC1845FTA
€0.038
Each (On a Tape of 2000)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW Single 120 V 5 V 110 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 761-9828
Mfr. Part No.BC547B
€0.255
Each (In a Pack of 50)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V 300 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 803-1083
Mfr. Part No.BC547BBU
€0.049
Each (In a Pack of 200)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V 1 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 166-2988
Mfr. Part No.BC547B
€0.054
Each (In a Bag of 10000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V 1 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 739-0442
Mfr. Part No.2N3904TA
€0.129
Each (In a Pack of 10)
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NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS Stock No. 842-8015
Mfr. Part No.2N3904BU
€0.033
Each (In a Bag of 1000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS Stock No. 843-1575
Mfr. Part No.2N3904BU
€0.117
Each (In a Pack of 50)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS Stock No. 805-1056
Mfr. Part No.2N3904TFR
€0.05
Each (In a Pack of 200)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS Stock No. 805-1043
Mfr. Part No.2N3904TAR
€0.051
Each (In a Pack of 200)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS Stock No. 124-1317
Mfr. Part No.2N3904TA
€0.028
Each (On a Reel of 2000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS Stock No. 169-8621
Mfr. Part No.BC559BTA
€0.032
Each (On a Tape of 2000)
units
PNP 100 mA 30 V TO-92 Through Hole 500 mW Single -30 V -5 V 10 MHz 3 1 5.2 x 4.19 x 5.33mm -