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. 445-2023
FabrikantnummerBC847CE6327HTSA1
FabrikantInfineon
€ 0,141
Each (In a Pack of 50)
Aantal stuks
NPN 100 mA 45 V SOT-23 Surface Mount 330 mW Single 50 V 6 V 250 MHz 3 1 1 x 2.9 x 1.3mm -
RS-stocknr. 445-2051
FabrikantnummerBC857BE6327HTSA1
FabrikantInfineon
€ 0,052
Each (In a Pack of 50)
Aantal stuks
PNP 100 mA 45 V SOT-23 Surface Mount 330 mW Single 50 V 5 V 250 MHz 3 1 1 x 2.9 x 1.3mm -
RS-stocknr. 911-4701
FabrikantnummerBC857BE6327HTSA1
FabrikantInfineon
€ 0,016
Each (On a Reel of 3000)
Aantal stuks
PNP 100 mA 45 V SOT-23 Surface Mount 250 mW Single -50 V -5 V - 3 1 3 x 1.4 x 1.2mm -
RS-stocknr. 165-7509
FabrikantnummerBCP5616H6327XTSA1
FabrikantInfineon
€ 0,083
Each (On a Reel of 1000)
Aantal stuks
NPN 1 A 80 V SOT-223 Surface Mount 2 W Single 100 V 5 V 100 MHz 3 + Tab 1 6.5 x 3.5 x 1.6mm -
RS-stocknr. 752-7971
FabrikantnummerBCP5616H6327XTSA1
FabrikantInfineon
€ 0,084
Each (In a Pack of 25)
Aantal stuks
NPN 1 A 80 V SOT-223 Surface Mount 2 W Single 100 V 5 V 100 MHz 3 + Tab 1 6.5 x 3.5 x 1.6mm -
RS-stocknr. 145-9719
FabrikantnummerBC846PNH6327XTSA1
FabrikantInfineon
€ 0,051
Each (On a Reel of 3000)
Aantal stuks
NPN + PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 250 mW Isolated 80 V 6 V 250 MHz 6 2 2 x 1.25 x 0.9mm -
RS-stocknr. 165-5622
FabrikantnummerBFP182WH6327XTSA1
FabrikantInfineon
€ 0,068
Each (On a Reel of 3000)
Aantal stuks
NPN 35 mA 12 V SOT-343 Surface Mount 250 mW Single 20 V 2 V 8 GHz 4 1 2 x 1.25 x 0.8mm -
RS-stocknr. 892-2223
FabrikantnummerBC846PNH6327XTSA1
FabrikantInfineon
€ 0,109
Each (In a Pack of 200)
Aantal stuks
NPN + PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 250 mW Isolated 80 V 6 V 250 MHz 6 2 2 x 1.25 x 0.9mm -
RS-stocknr. 826-9367
FabrikantnummerBFP182WH6327XTSA1
FabrikantInfineon
€ 0,101
Each (In a Pack of 100)
Aantal stuks
NPN 35 mA 12 V SOT-343 Surface Mount 250 mW Single 20 V 2 V 8 GHz 4 1 2 x 1.25 x 0.8mm -
RS-stocknr. 145-9449
FabrikantnummerBCX53H6327XTSA1
FabrikantInfineon
€ 0,095
Each (On a Reel of 1000)
Aantal stuks
PNP 1 A 80 V SOT-89 Surface Mount 2 W Single 100 V 5 V 125 MHz 3 1 4.5 x 2.5 x 1.6mm -
RS-stocknr. 897-7188
FabrikantnummerBFP420FH6327XTSA1
FabrikantInfineon
€ 0,263
Each (In a Pack of 30)
Aantal stuks
NPN 60 mA 15 V TSFP Surface Mount 210 mW Single 15 V 1.5 V - 4 1 1.4 x 0.8 x 0.55mm -
RS-stocknr. 857-8371
FabrikantnummerBCR573E6433HTMA1
FabrikantInfineon
€ 0,04
Each (On a Reel of 10000)
Aantal stuks
PNP - 50 V SOT-23 Surface Mount 330 mW Single - 5 V - 3 1 2.9 x 1.3 x 0.9mm -
RS-stocknr. 857-8362
FabrikantnummerBCR573E6327HTSA1
FabrikantInfineon
€ 0,184
Each (On a Reel of 3000)
Aantal stuks
PNP - 50 V SOT-23 Surface Mount 330 mW Single - 5 V - 3 1 2.9 x 1.3 x 0.9mm -
RS-stocknr. 752-7896
FabrikantnummerBC807UE6327HTSA1
FabrikantInfineon
€ 0,048
Each (In a Pack of 25)
Aantal stuks
PNP 500 mA 45 V SC-74 Surface Mount 330 mW Isolated 50 V 5 V 200 MHz 6 2 2.9 x 1.6 x 1mm -
RS-stocknr. 445-2039
FabrikantnummerBC848CE6327HTSA1
FabrikantInfineon
€ 0,046
Each (In a Pack of 50)
Aantal stuks
NPN 100 mA 30 V SOT-23 Surface Mount 330 mW Single 30 V 6 V 250 MHz 3 1 1 x 2.9 x 1.3mm -
RS-stocknr. 445-2146
FabrikantnummerBDP949
FabrikantInfineon
€ 0,582
Each (In a Pack of 5)
Aantal stuks
NPN 3 A 60 V SOT-223 Surface Mount 5 W Single 60 V 5 V 100 MHz 3 + Tab 1 1.6 x 6.5 x 3.5mm -
RS-stocknr. 857-8753
FabrikantnummerSMBTA06E6433HTMA1
FabrikantInfineon
€ 0,027
Each (On a Reel of 10000)
Aantal stuks
NPN 500 mA 80 V SOT-23 Surface Mount 330 mW Single 80 V 4 V 100 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS-stocknr. 110-7100
FabrikantnummerBFP460H6327XTSA1
FabrikantInfineon
€ 0,285
Each (In a Pack of 50)
Aantal stuks
NPN 70 mA 15 V SOT-343 Surface Mount 230 mW Single 15 V 1.5 V - 4 1 2 x 1.25 x 0.8mm -
RS-stocknr. 752-8101
FabrikantnummerBCX53H6327XTSA1
FabrikantInfineon
€ 0,188
Each (In a Pack of 25)
Aantal stuks
PNP 1 A 80 V SOT-89 Surface Mount 2 W Single 100 V 5 V 125 MHz 3 1 4.5 x 2.5 x 1.6mm -
RS-stocknr. 165-8072
FabrikantnummerBFP420FH6327XTSA1
FabrikantInfineon
€ 0,10
Each (On a Reel of 3000)
Aantal stuks
NPN 60 mA 15 V TSFP Surface Mount 210 mW Single 15 V 1.5 V - 4 1 1.4 x 0.8 x 0.55mm -