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. 163-2501
FabrikantnummerMJD50T4G
FabrikantON Semiconductor
0,172 €
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NPN 1 A 400 V DPAK (TO-252) Surface Mount 1.56 W Single 500 V 5 V 10 MHz 3 1 2.38 x 6.73 x 6.22mm -
RS-stocknr. 725-8477
FabrikantnummerPDTC143ET,215
FabrikantNexperia
0,053 €
Each (In a Pack of 200)
Aantal stuks
NPN - 50 V SOT-23 Surface Mount 250 mW Single - 10 V - 3 1 3 x 1.4 x 1mm -
RS-stocknr. 823-2854
FabrikantnummerDDTC114WCA-7-F
FabrikantDiodesZetex
0,059 €
Each (In a Pack of 200)
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NPN - 50 V SOT-23 Surface Mount 200 mW Single - 30 V - 3 1 3 x 1.4 x 1mm -
RS-stocknr. 806-4532
FabrikantnummerKSD1616AYTA
FabrikantON Semiconductor
0,243 €
Each (In a Pack of 50)
Aantal stuks
NPN 1 A 60 V TO-92 Through Hole 750 mW Single 120 V 6 V 1 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS-stocknr. 841-205
FabrikantnummerZTX690B
FabrikantDiodesZetex
0,77 €
Each (In a Pack of 5)
Aantal stuks
NPN 2 A 45 V E-Line Through Hole 1 W Single 45 V 5 V 150 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS-stocknr. 725-8625
FabrikantnummerPMBS3904,215
FabrikantNexperia
0,041 €
Each (In a Pack of 100)
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NPN 100 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 60 V 6 V - 3 1 1 x 3 x 1.4mm -
RS-stocknr. 805-4478
FabrikantnummerSMUN5235T1G
FabrikantON Semiconductor
0,076 €
Each (On a Tape of 100)
Aantal stuks
NPN - 50 V SOT-323 (SC-70) Surface Mount 310 mW Single - - - 3 1 2.2 x 1.35 x 0.9mm -
RS-stocknr. 178-7149
FabrikantnummerBCW70,215
FabrikantNexperia
0,034 €
Each (On a Reel of 3000)
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PNP 100 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. 709-8512
FabrikantnummerMAT01GHZ
FabrikantAnalog Devices
18,36 €
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NPN 25 mA 45 V TO-78 Through Hole 500 mW Isolated - - 450 MHz 6 2 4.7 x 9.4 x 9.4mm -
RS-stocknr. 145-3535
FabrikantnummerBCW65ALT1G
FabrikantON Semiconductor
0,021 €
Each (On a Reel of 3000)
Aantal stuks
NPN 800 mA 32 V SOT-23 Surface Mount 225 mW Single 60 V dc 5 V 100 MHz 3 1 3.04 x 2.64 x 1.11mm -
RS-stocknr. 186-8437
FabrikantnummerMUN5212DW1T1G
FabrikantON Semiconductor
0,131 €
Each (In a Pack of 50)
Aantal stuks
NPN - 50 V dc SOT-363 Surface Mount 385 mW - - - - 6 2 2.2 x 1.35 x 1mm -
RS-stocknr. 165-8597
FabrikantnummerDDTC123JCA-7-F
FabrikantDiodesZetex
0,012 €
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NPN - 50 V SOT-23 Surface Mount 200 mW Single - 12 V - 3 1 3 x 1.4 x 1mm -
RS-stocknr. 186-7151
FabrikantnummerFDG6301N-F085
FabrikantON Semiconductor
0,105 €
Each (On a Reel of 3000)
Aantal stuks
- - - SC-70 Surface Mount 300 mW - - - - 6 2 2.2 x 1.35 x 1mm -
RS-stocknr. 669-7417
FabrikantnummerZXTD4591E6TA
FabrikantDiodesZetex
0,474 €
Each (In a Pack of 10)
Aantal stuks
NPN + PNP 1 A 60 V SOT-23 Surface Mount 1.7 W Isolated 80 V 5 V 150 MHz 6 2 1.3 x 3 x 1.75mm -
RS-stocknr. 177-5499
Fabrikantnummer2N2907ACSM
FabrikantSemelab
14,286 €
Each (In a Tray of 100)
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PNP 600 mA 60 V LCC 1 Surface Mount 500 mW Single -60 V -5 V - 3 1 3.05 x 2.54 x 1.4mm -
RS-stocknr. 186-8046
FabrikantnummerBD179G
FabrikantON Semiconductor
0,406 €
Each (In a Pack of 25)
Aantal stuks
NPN - 80 V dc TO-225 Through Hole 30 W Single - 5 V dc - 3 1 7.8 x 3 x 11.1mm -
RS-stocknr. 166-3385
FabrikantnummerBCP55
FabrikantON Semiconductor
0,112 €
Each (On a Reel of 4000)
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NPN 1.5 A 60 V SOT-223 Surface Mount 1.5 W Single 60 V 5 V - 3 + Tab 1 6.5 x 3.5 x 1.6mm -
RS-stocknr. 752-7990
FabrikantnummerBCR116WH6327XTSA1
FabrikantInfineon
0,028 €
Each (In a Pack of 100)
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NPN - 50 V SOT-323 (SC-70) Surface Mount 250 mW Single - - - 3 1 2 x 1.25 x 0.8mm -
RS-stocknr. 186-7434
FabrikantnummerSMP3003-TL-1E
FabrikantON Semiconductor
1,837 €
Each (On a Reel of 800)
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- - - TO-263 Surface Mount 90 W - - - - 2 + Tab 1 10 x 9.2 x 4.5mm -
RS-stocknr. 128-8826
Fabrikantnummer2SCR372P5T100
FabrikantROHM
0,38 €
Each (In a Pack of 25)
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NPN 700 mA 120 V SOT-89 Surface Mount 500 mW Common Emitter 120 V 6 V 100 MHz 3 + Tab 1 4.7 x 2.7 x 1.4mm -