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 Minimum Operating Temperature
RS-stocknr. 484-5065
FabrikantnummerBC847C,215
FabrikantNexperia
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 -
RS-stocknr. 922-7829
FabrikantnummerFZT853TA
FabrikantDiodesZetex
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 -
RS-stocknr. 790-5450
FabrikantnummerNJW0281G
FabrikantON Semiconductor
2,175 €
Each (In a Pack of 2)
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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 -
RS-stocknr. 751-5445
FabrikantnummerZXTN25100BFHTA
FabrikantDiodesZetex
0,402 €
Each (In a Pack of 25)
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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 -
RS-stocknr. 436-7903
FabrikantnummerBC817-25,215
FabrikantNexperia
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 -
RS-stocknr. 739-0442
Fabrikantnummer2N3904TA
FabrikantON Semiconductor
0,129 €
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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-stocknr. 102-2276
FabrikantnummerMJE15033G
FabrikantON Semiconductor
1,029 €
Each (In a Tube of 50)
Aantal stuks
PNP 8 A 250 V TO-220AB Through Hole 50 W Single 250 V 5 V 30 MHz 3 1 9.28 x 10.28 x 4.82mm -
RS-stocknr. 103-7552
FabrikantnummerBC847C,215
FabrikantNexperia
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 -
RS-stocknr. 125-0066
FabrikantnummerMJ21193G
FabrikantON Semiconductor
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 -
RS-stocknr. 802-4559
FabrikantnummerMJW18020G
FabrikantON Semiconductor
5,74 €
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Aantal stuks
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 -
RS-stocknr. 843-1575
Fabrikantnummer2N3904BU
FabrikantON Semiconductor
0,117 €
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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-stocknr. 296-273
FabrikantnummerMJ15004G
FabrikantON Semiconductor
5,65 €
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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 -
RS-stocknr. 168-6044
FabrikantnummerBD911
0,95 €
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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 -
RS-stocknr. 124-1317
Fabrikantnummer2N3904TA
FabrikantON Semiconductor
0,028 €
Each (On a Reel of 2000)
Aantal stuks
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-stocknr. 124-1315
FabrikantnummerKSP2222ABU
FabrikantON Semiconductor
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 -
RS-stocknr. 690-0091
FabrikantnummerBC847BLT3G
FabrikantON Semiconductor
0,091 €
Each (In a Pack of 25)
Aantal stuks
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 -
RS-stocknr. 296-273A
FabrikantnummerMJ15004G
FabrikantON Semiconductor
6,502 €
Each (In a Pack of 5)
Aantal stuks
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 -
RS-stocknr. 792-0822
FabrikantnummerBC856BS,115
FabrikantNexperia
0,058 €
Each (On a Reel of 100)
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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 -
RS-stocknr. 122-0070
FabrikantnummerMJ15004G
FabrikantON Semiconductor
3,918 €
Each (In a Tray of 100)
Aantal stuks
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 -
RS-stocknr. 124-1460
Fabrikantnummer2SC5200OTU
FabrikantON Semiconductor
2,353 €
Each (In a Tube of 25)
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NPN 17 A 250 V TO-264 Through Hole 150 W Single 250 V 5 V 30 MHz 3 1 20 x 5 x 26mm -