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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Omschrijving Prijs 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 Maximum Base Emitter Saturation Voltage
RS-stocknr. 796-9723
FabrikantnummerBC549C A1
0,112 €
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NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 170-4155
FabrikantnummerBC546B A1
0,029 €
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NPN 100 mA 65 V TO-92 Through Hole 500 mW Single 80 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 796-9690
FabrikantnummerBC546B A1
0,114 €
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NPN 100 mA 65 V TO-92 Through Hole 500 mW Single 80 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 170-4162
FabrikantnummerBC548C A1
0,029 €
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NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 796-9717
FabrikantnummerBC548C A1
0,114 €
Each (In a Pack of 250)
Aantal stuks
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 170-4164
FabrikantnummerBC549C A1
0,029 €
Each (On a Tape of 4000)
Aantal stuks
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 796-9675
FabrikantnummerBC337-16 A1
0,129 €
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NPN 800 mA 45 V TO-92 Through Hole 625 mW Single 50 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 170-4151
FabrikantnummerBC337-16 A1
0,033 €
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NPN 800 mA 45 V TO-92 Through Hole 625 mW Single 50 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 170-4152
FabrikantnummerBC337-25 A1
0,034 €
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NPN 800 mA 45 V TO-92 Through Hole 625 mW Single 50 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 796-9678
FabrikantnummerBC337-25 A1
0,131 €
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Aantal stuks
NPN 800 mA 45 V TO-92 Through Hole 625 mW Single 50 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 796-9704
FabrikantnummerBC547A A1
0,012 €
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NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 146-2333
FabrikantnummerBC548B A1
0,029 €
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Aantal stuks
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 796-9672
FabrikantnummerBC337-40 A1
0,131 €
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NPN 800 mA 45 V TO-92 Through Hole 625 mW Single 50 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 796-9713
FabrikantnummerBC548B A1
0,103 €
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Aantal stuks
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 169-9293
FabrikantnummerBC817-25 RF
0,029 €
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NPN 500 mA 45 V SOT-23 Surface Mount 300 mW Single 50 V 5 V 100 MHz 3 1 3 x 1.4 x 1.2mm -
RS-stocknr. 170-4159
FabrikantnummerBC547A A1
0,013 €
Each (On a Tape of 4000)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 796-9739
FabrikantnummerBC550C A1
0,112 €
Each (In a Pack of 250)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 796-9701
FabrikantnummerBC547C A1
0,114 €
Each (In a Pack of 250)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 170-4169
FabrikantnummerBC550C A1
0,029 €
Each (On a Tape of 4000)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS-stocknr. 170-4158
FabrikantnummerBC547C A1
0,029 €
Each (On a Tape of 4000)
Aantal stuks
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -