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 146-0502
Référence fabricantBC856BS,115
MarqueNexperia
0,027 €
Each (On a Reel of 3000)
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PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 300 mW Isolated -80 V -6 V - 6 2 2.2 x 1.35 x 1.1mm -
N° de stock RS 842-8015
Référence fabricant2N3904BU
0,033 €
Each (In a Bag of 1000)
Unité
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 -
N° de stock RS 124-5326
Référence fabricantMJW18020G
4,951 €
Each (In a Tube of 30)
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NPN 30 A 450 V TO-247 Through Hole 250 W Single 1000 V dc 9 V 1 MHz 3 1 16.26 x 5.3 x 21.08mm -
N° de stock RS 168-6254
Référence fabricantMJE350
0,409 €
Each (In a Tube of 50)
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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 484-5065
Référence fabricantBC847C,215
MarqueNexperia
0,095 €
Each (In a Pack of 50)
Unité
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 102-1371
Référence fabricantMJD45H11T4G
0,209 €
Each (On a Reel of 2500)
Unité
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 -
N° de stock RS 545-0236
Référence fabricantMJ21194G
5,95 €
Each
Unité
NPN 16 A 250 V TO-204 Through Hole 250 W Single 400 V 5 V 4 MHz 3 1 8.51 x 39.37 x 26.67mm -
N° de stock RS 805-1056
Référence fabricant2N3904TFR
0,05 €
Each (In a Pack of 200)
Unité
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 170-3431
Référence fabricantBC847BLT3G
0,014 €
Each (On a Reel of 10000)
Unité
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 168-6172
Référence fabricantTIP47
0,423 €
Each (In a Tube of 50)
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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 125-0067
Référence fabricantMJ21194G
4,251 €
Each (In a Tray of 100)
Unité
NPN 16 A 250 V TO-204 Through Hole 250 W Single 400 V 5 V 4 MHz 3 1 8.51 x 39.37 x 26.67mm -
N° de stock RS 485-9834
Référence fabricantTIP47
0,51 €
Each (In a Pack of 5)
Unité
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 103-1578
Référence fabricantBU508AW
1,947 €
Each (In a Tube of 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 103-7552
Référence fabricantBC847C,215
MarqueNexperia
0,017 €
Each (On a Reel of 3000)
Unité
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 124-5389
Référence fabricantNJW0281G
2,12 €
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NPN 15 A 250 V TO-3P Through Hole 150 W Single 250 V dc 5 V 1 MHz 3 1 15.8 x 5 x 20.1mm -
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 124-1317
Référence fabricant2N3904TA
0,028 €
Each (On a Reel of 2000)
Unité
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 690-0091
Référence fabricantBC847BLT3G
0,091 €
Each (In a Pack of 25)
Unité
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 296-273
Référence fabricantMJ15004G
5,65 €
Each
Unité
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 792-0822
Référence fabricantBC856BS,115
MarqueNexperia
0,058 €
Each (On a Reel of 100)
Unité
PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 300 mW Isolated -80 V -6 V - 6 2 2.2 x 1.35 x 1.1mm -