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 822-2334
Référence fabricantDDC123JU-7-F
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0,012 €
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NPN - 50 V SOT-363 (SC-88) Surface Mount 200 mW Isolated - 5 V - 6 2 2.2 x 1.35 x 1mm -
N° de stock RS 103-1578
Référence fabricantBU508AW
1,947 €
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NPN 8 A 700 V TO-247 Through Hole 125 W Single - 9 V - 3 1 20.15 x 15.75 x 5.15mm -
N° de stock RS 168-6254
Référence fabricantMJE350
0,409 €
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PNP 500 mA 300 V SOT-32 Through Hole 20.8 W Single 300 V 3 V - 3 1 10.8 x 7.8 x 2.7mm -
N° de stock RS 103-7552
Référence fabricantBC847C,215
MarqueNexperia
0,017 €
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NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 50 V 6 V 100 MHz 3 1 1 x 3 x 1.4mm -
N° de stock RS 124-1315
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0,042 €
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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 -
N° de stock RS 169-3158
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1,11 €
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NPN 15 A 100 V TO-220 Through Hole 90 W Single 100 V 5 V 3 MHz 3 1 9.15 x 10.4 x 4.6mm -
N° de stock RS 714-6746
Référence fabricantBU508AW
2,30 €
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NPN 8 A 700 V TO-247 Through Hole 125 W Single - 9 V - 3 1 20.15 x 15.75 x 5.15mm -
N° de stock RS 124-1317
Référence fabricant2N3904TA
0,028 €
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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 -
N° de stock RS 436-7903
Référence fabricantBC817-25,215
MarqueNexperia
0,105 €
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NPN 500 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 50 V 5 V 100 MHz 3 1 1 x 3 x 1.4mm -
N° de stock RS 163-0976
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0,016 €
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PNP - 50 V SOT-23 Surface Mount 400 mW Single - - - 3 1 3.04 x 1.4 x 1.01mm -
N° de stock RS 296-273A
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6,502 €
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PNP 20 A 140 V TO-204AA Through Hole 250 W Single 140 V 5 V 2 MHz 2 1 39.37 x 26.67 x 8.51mm -
N° de stock RS 922-7829
Référence fabricantFZT853TA
MarqueDiodesZetex
0,353 €
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NPN 6 A 100 V SOT-223 Surface Mount 3 W Single 200 V 6 V 130 MHz 3 + Tab 1 1.65 x 6.55 x 3.55mm -
N° de stock RS 125-0066
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4,251 €
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PNP 16 A 250 V TO-204AA Through Hole 250 W Single -400 V -5 V - 2 1 39.37 x 26.67 x 8.51mm -
N° de stock RS 484-5065
Référence fabricantBC847C,215
MarqueNexperia
0,095 €
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NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 50 V 6 V 100 MHz 3 1 1 x 3 x 1.4mm -
N° de stock RS 170-3431
Référence fabricantBC847BLT3G
0,014 €
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NPN 100 mA 45 V SOT-23 Surface Mount 300 mW Single 50 V 6 V 100 MHz 3 1 0.94 x 2.9 x 1.3mm -
N° de stock RS 165-8824
Référence fabricantDDC123JU-7-F
MarqueDiodesZetex
0,017 €
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NPN - 50 V SOT-363 (SC-88) Surface Mount 200 mW Isolated - 5 V - 6 2 2.2 x 1.35 x 1mm -
N° de stock RS 168-6172
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0,423 €
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NPN 1 A 250 V TO-220 Through Hole 2 W Single 350 V 5 V 10 MHz 3 1 9.15 x 10.4 x 4.6mm -
N° de stock RS 485-9834
Référence fabricantTIP47
0,51 €
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NPN 1 A 250 V TO-220 Through Hole 2 W Single 350 V 5 V 10 MHz 3 1 9.15 x 10.4 x 4.6mm -
N° de stock RS 751-5445
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NPN 3 A 100 V SOT-23 Surface Mount 1.81 W Single 170 V 7 V 160 MHz 3 1 3.05 x 1.4 x 1mm -
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0,434 €
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PNP 8 A 80 V DPAK (TO-252) Surface Mount 1.75 W Single - 5 V 90 MHz 3 1 2.38 x 6.73 x 6.22mm -