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 Prix 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
N° de stock RS 800-9320
Référence fabricant2SC5415AE-TD-E
0,444 €
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NPN 100 mA 12 V PCP Surface Mount 800 mW Single 20 V 2 V 8 GHz 3 1 4.5 x 2.5 x 1.5mm -
N° de stock RS 145-4171
Référence fabricant2SC5415AE-TD-E
0,14 €
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NPN 100 mA 12 V PCP Surface Mount 800 mW Single 20 V 2 V 8 GHz 3 1 4.5 x 2.5 x 1.5mm -
N° de stock RS 896-2625
Référence fabricant2SC2712-Y,LF(T
MarqueToshiba
0,067 €
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NPN 150 mA 50 V TO-236MOD Surface Mount 150 mW Single 60 V 5 V 80 MHz 3 1 2.9 x 1.5 x 1.1mm -
N° de stock RS 751-5411
Référence fabricantZXTN2031FTA
MarqueDiodesZetex
0,562 €
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NPN 5 A 50 V SOT-23 Surface Mount 1.56 W Single 80 V 7 V 125 MHz 3 1 3.05 x 1.4 x 1mm -
N° de stock RS 739-0331
Référence fabricantKSP2907ATA
0,161 €
Each (In a Pack of 10)
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PNP 600 mA 60 V TO-92 Through Hole 625 mW Single -60 V -5 V - 3 1 4.58 x 3.86 x 4.58mm -
N° de stock RS 436-8079
Référence fabricantBFS20,215
MarqueNexperia
0,281 €
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NPN 25 mA 20 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 30 V 4 V 450 MHz 3 1 1 x 3 x 1.4mm -
N° de stock RS 124-1732
Référence fabricantBC33740TA
0,04 €
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NPN 800 mA 45 V TO-92 Through Hole 625 mW Single - 5 V 100 MHz 3 1 5.33 x 5.2 x 4.19mm -
N° de stock RS 761-9831
Référence fabricantBC556BTA
0,057 €
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PNP 100 mA 65 V TO-92 Through Hole 500 mW Single -80 V -5 V 150 MHz 3 1 4.58 x 3.86 x 4.58mm -
N° de stock RS 671-1119
Référence fabricantBC33740TA
0,178 €
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NPN 800 mA 45 V TO-92 Through Hole 625 mW Single - 5 V 100 MHz 3 1 5.33 x 5.2 x 4.19mm -
N° de stock RS 166-3072
Référence fabricantBC556BTA
0,025 €
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PNP 100 mA 65 V TO-92 Through Hole 500 mW Single -80 V -5 V 10 MHz 3 1 5.2 x 4.19 x 5.33mm -
N° de stock RS 146-2100
Référence fabricantBC556BTFR
0,033 €
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PNP 100 mA 65 V TO-92 Through Hole 500 mW Single -80 V -5 V 10 MHz 3 1 5.2 x 4.19 x 5.33mm -
N° de stock RS 803-1131
Référence fabricantBC556BTFR
0,06 €
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PNP 100 mA 65 V TO-92 Through Hole 500 mW Single -80 V -5 V 10 MHz 3 1 5.2 x 4.19 x 5.33mm -
N° de stock RS 145-5536
Référence fabricantKSP2907ATA
0,036 €
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PNP 600 mA 60 V TO-92 Through Hole 625 mW Single -60 V -5 V - 3 1 4.58 x 3.86 x 4.58mm -
N° de stock RS 922-8525
Référence fabricantZXTN2031FTA
MarqueDiodesZetex
0,279 €
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NPN 5 A 50 V SOT-23 Surface Mount 1.56 W Single 80 V 7 V 125 MHz 3 1 3.05 x 1.4 x 1mm -
N° de stock RS 166-1220
Référence fabricantBFS20,215
MarqueNexperia
0,083 €
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NPN 25 mA 20 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 30 V 4 V 450 MHz 3 1 1 x 3 x 1.4mm -
N° de stock RS 102-4110
Référence fabricantBD139-16
0,256 €
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NPN 3 A 80 V SOT-32 Through Hole 1.25 W Single 80 V 5 V - 3 1 10.8 x 7.8 x 2.7mm -
N° de stock RS 686-8063
Référence fabricantBD139-16
0,256 €
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NPN 3 A 80 V SOT-32 Through Hole 1.25 W Single 80 V 5 V - 3 1 10.8 x 7.8 x 2.7mm -
N° de stock RS 314-1817
Référence fabricantBD140
0,50 €
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PNP 3 A 80 V SOT-32 Through Hole 1.25 W Single 80 V 5 V - 3 1 10.8 x 7.8 x 2.7mm -
N° de stock RS 168-6074
Référence fabricantBD140
0,409 €
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PNP 3 A 80 V SOT-32 Through Hole 1.25 W Single 80 V 5 V - 3 1 10.8 x 7.8 x 2.7mm -
N° de stock RS 803-1061
Référence fabricantBC33725TFR
0,082 €
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NPN 800 mA 50 V TO-92 Through Hole 625 mW Single 10 V 5 V 50 MHz 3 1 4.58 x 3.86 x 4.58mm -