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. 725-8483
FabrikantnummerPDTC114EE,115
FabrikantNXP
€ 0,07
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NPN - 50 V SOT-416 (SC-75) Surface Mount 150 mW Single - 10 V - 3 1 1.8 x 0.9 x 0.85mm -
RS-stocknr. 792-0872
FabrikantnummerBLT81,115
FabrikantNXP
€ 1,63
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Aantal stuks
NPN 500 mA 9.5 V SOT-223 Surface Mount 2 W Single 20 V 2.5 V 900 MHz 3 + Tab 1 6.7 x 3.7 x 1.8mm -
RS-stocknr. 165-9834
FabrikantnummerBLT81,115
FabrikantNXP
€ 1,329
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NPN 500 mA 9.5 V SOT-223 Surface Mount 2 W Single 20 V 2.5 V 900 MHz 3 + Tab 1 6.7 x 3.7 x 1.8mm -
RS-stocknr. 626-2838
FabrikantnummerBFT25A,215
FabrikantNXP
€ 0,412
Each (In a Pack of 10)
Aantal stuks
NPN 7 mA 5 V SOT-23 (TO-236AB) Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 3 x 1.4mm -
RS-stocknr. 626-2715
FabrikantnummerBFQ18A,115
FabrikantNXP
€ 0,686
Each (In a Pack of 5)
Aantal stuks
NPN 150 mA 18 V UPAK Surface Mount 1 W Single 25 V 2 V 4000 MHz 4 1 1.6 x 4.6 x 2.6mm -
RS-stocknr. 165-8721
FabrikantnummerBFU725F/N1
FabrikantNXP
€ 0,115
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Aantal stuks
NPN 40 mA 2.8 V SOT-343F Surface Mount 136 mW Single 10 V 1 V 12 GHz 4 1 2.2 x 1.35 x 1mm -
RS-stocknr. 166-0543
FabrikantnummerBFS25A,115
FabrikantNXP
€ 0,185
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Aantal stuks
NPN 7 mA 5 V UMT Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 2.2 x 1.35mm -
RS-stocknr. 509-453
FabrikantnummerPMD9003D,115
FabrikantNXP
€ 0,138
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NPN - 50 V TSOP Surface Mount - - - 10 V - 6 2 3.1 x 1.7 x 1mm -
RS-stocknr. 166-0549
FabrikantnummerPRF957,115
FabrikantNXP
€ 0,069
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NPN 100 mA 10 V UMT Surface Mount 270 mW Single 20 V 1.5 V 8500 MHz 3 1 1 x 2.2 x 1.35mm -
RS-stocknr. 626-2793
FabrikantnummerBFS25A,115
FabrikantNXP
€ 0,222
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Aantal stuks
NPN 7 mA 5 V UMT Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 2.2 x 1.35mm -
RS-stocknr. 166-0540
FabrikantnummerBFG325W/XR,115
FabrikantNXP
€ 0,076
Each (On a Reel of 3000)
Aantal stuks
NPN 35 mA 6 V CMPAK Surface Mount 210 mW Single 15 V 2 V 14000 MHz 4 1 1 x 2.2 x 1.35mm -
RS-stocknr. 725-8489
FabrikantnummerPDTA114EE,115
FabrikantNXP
€ 0,066
Each (In a Pack of 200)
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PNP - 50 V SOT-416 (SC-75) Surface Mount 150 mW Single - 10 V - 3 1 1.8 x 0.9 x 0.85mm -
RS-stocknr. 816-7801
FabrikantnummerBFU725F/N1
FabrikantNXP
€ 0,229
Each (In a Pack of 30)
Aantal stuks
NPN 40 mA 2.8 V SOT-343F Surface Mount 136 mW Single 10 V 1 V 12 GHz 4 1 2.2 x 1.35 x 1mm -
RS-stocknr. 179-1060
FabrikantnummerBFT25A,215
FabrikantNXP
€ 0,18
Each (On a Reel of 3000)
Aantal stuks
NPN 7 mA 5 V SOT-23 (TO-236AB) Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 3 x 1.4mm -
RS-stocknr. 626-3342
FabrikantnummerPRF957,115
FabrikantNXP
€ 0,066
Each (In a Pack of 10)
Aantal stuks
NPN 100 mA 10 V UMT Surface Mount 270 mW Single 20 V 1.5 V 8500 MHz 3 1 1 x 2.2 x 1.35mm -
RS-stocknr. 626-2535
FabrikantnummerBFG325W/XR,115
FabrikantNXP
€ 0,077
Each (In a Pack of 10)
Aantal stuks
NPN 35 mA 6 V CMPAK Surface Mount 210 mW Single 15 V 2 V 14000 MHz 4 1 1 x 2.2 x 1.35mm -
RS-stocknr. 166-0433
FabrikantnummerBFQ18A,115
FabrikantNXP
€ 0,536
Each (On a Reel of 1000)
Aantal stuks
NPN 150 mA 18 V UPAK Surface Mount 1 W Single 25 V 2 V 4000 MHz 4 1 1.6 x 4.6 x 2.6mm -