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. 145-3956
FabrikantnummerBC847CDW1T1G
FabrikantON Semiconductor
€ 0,026
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NPN 100 mA 45 V SOT-363 (SC-88) Surface Mount 380 mW Single 50 V 6 V 100 MHz 6 1 2.2 x 1.35 x 1.1mm -
RS-stocknr. 823-3040
FabrikantnummerMMBTA56-7-F
FabrikantDiodesZetex
€ 0,059
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PNP 500 mA 80 V SOT-23 Surface Mount 300 mW Single -80 V -4 V 50 MHz 3 1 3 x 1.4 x 1mm -
RS-stocknr. 168-1996
FabrikantnummerDTC123EKAT146
FabrikantROHM
€ 0,048
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NPN 100 mA - SOT-346 Surface Mount 200 mW Single - - 250 MHz 3 1 3 x 1.8 x 1.2mm -
RS-stocknr. 145-4345
FabrikantnummerBD13916STU
FabrikantON Semiconductor
€ 0,329
Each (In a Tube of 60)
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NPN 1.5 A 80 V TO-126 Through Hole 12.5 W Single 80 V 5 V - 3 1 8 x 3.25 x 11mm -
RS-stocknr. 792-0866
FabrikantnummerBCX56,115
FabrikantNexperia
€ 0,221
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NPN 1 A 80 V SOT-89 Surface Mount 1.35 W Single 100 V 5 V - 3 1 4.6 x 2.6 x 1.6mm -
RS-stocknr. 121-9416
FabrikantnummerFZT849TA
FabrikantDiodesZetex
€ 0,353
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NPN 7 A 30 V SOT-223 Surface Mount 3 W Single 80 V 6 V 100 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -
RS-stocknr. 145-3352
FabrikantnummerBCW33LT3G
FabrikantON Semiconductor
€ 0,02
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NPN 100 mA 32 V SOT-23 Surface Mount 225 mW Single -32 V dc -32 V 1 MHz 3 1 3.04 x 2.64 x 1.11mm -
RS-stocknr. 186-7434
FabrikantnummerSMP3003-TL-1E
FabrikantON Semiconductor
€ 1,837
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- - - TO-263 Surface Mount 90 W - - - - 2 + Tab 1 10 x 9.2 x 4.5mm -
RS-stocknr. 803-1144
FabrikantnummerBC559CTA
FabrikantON Semiconductor
€ 0,053
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PNP 100 mA 30 V TO-92 Through Hole 500 mW Single -30 V -5 V 10 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS-stocknr. 911-4741
FabrikantnummerBCW68GE6327HTSA1
FabrikantInfineon
€ 0,03
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PNP 800 mA 45 V SOT-23 Surface Mount 330 mW Single 45 V 5 V 200 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS-stocknr. 823-3031
FabrikantnummerMMBTA55-7-F
FabrikantDiodesZetex
€ 0,011
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PNP 500 mA 60 V SOT-23 Surface Mount 300 mW Single -60 V -4 V 50 MHz 3 1 3 x 1.4 x 1mm -
RS-stocknr. 145-3418
FabrikantnummerBC847BM3T5G
FabrikantON Semiconductor
€ 0,021
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NPN 100 mA 45 V SOT-723 Surface Mount 260 mW Single 50 V 6 V 100 MHz 3 1 1.25 x 0.85 x 0.55mm -
RS-stocknr. 653-2480
FabrikantnummerBCV61A,215
FabrikantNexperia
€ 0,237
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NPN 100 mA 30 V SOT-143B Surface Mount 250 mW Current Mirror 30 V 6 V 100 MHz 4 2 1 x 3 x 1.4mm -
RS-stocknr. 751-5247
FabrikantnummerZTX718
FabrikantDiodesZetex
€ 0,541
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PNP 2.5 A 20 V TO-92 Through Hole 1 W Single -20 V -5 V 180 MHz 3 1 4.77 x 2.41 x 4.01mm -
RS-stocknr. 186-7894
FabrikantnummerBDX33BG
FabrikantON Semiconductor
€ 0,638
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NPN - 80 V dc TO-220 Through Hole 70 W Single - 5 V dc - 3 1 10.53 x 4.83 x 9.28mm -
RS-stocknr. 805-4474
FabrikantnummerSMUN5212T1G
FabrikantON Semiconductor
€ 0,022
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NPN - 50 V SOT-323 (SC-70) Surface Mount 310 mW Single - - - 3 1 2.2 x 1.35 x 0.9mm -
RS-stocknr. 822-2652
FabrikantnummerDNLS350E-13
FabrikantDiodesZetex
€ 0,274
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NPN 3 A 50 V SOT-223 Surface Mount 2 W Single 60 V 6 V 100 MHz 3 + Tab 1 6.55 x 3.55 x 1.65mm -
RS-stocknr. 707-4291
FabrikantnummerDSC700300L
FabrikantPanasonic
€ 0,132
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NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W Single 60 V 5 V 170 MHz 3 1 4.5 x 2.5 x 1.5mm -
RS-stocknr. 816-7785
FabrikantnummerBCX70J
FabrikantNexperia
€ 0,027
Each (In a Pack of 200)
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NPN 100 mA 45 V SOT-23 Surface Mount 250 mW Single 45 V 5 V 100 MHz 3 1 3 x 1.4 x 1mm -
RS-stocknr. 826-8349
Fabrikantnummer2SA2088T106Q
FabrikantROHM
€ 0,066
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PNP 500 mA 60 V UMT Surface Mount 200 mW Single -60 V -6 V 10 MHz 3 1 2 x 1.25 x 0.9mm -