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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Description Price Transistor Type Maximum DC Collector Current Maximum Collector Emitter Voltage Package Type Mounting Type Maximum Power Dissipation Minimum DC Current Gain Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Dimensions
RS Stock No. 168-6044
Mfr. Part No.BD911
kr 13,30
Each (In a Tube of 50)
Units
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 Stock No. 169-3158
Mfr. Part No.BD911
kr 15,55
Each
Units
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 Stock No. 774-3571
Mfr. Part No.MJL21194G
Brandonsemi
kr 50,33
Each
Units
NPN 16 A 250 V TO-3BPL Through Hole 200 W - Single 400 V 5 V 1 MHz 3 1 20.3 x 5.3 x 29mm
RS Stock No. 103-5143
Mfr. Part No.MJL21194G
Brandonsemi
kr 44,747
Each (In a Tube of 25)
Units
NPN 16 A 250 V TO-3BPL Through Hole 200 W - Single 400 V 5 V 1 MHz 3 1 20.3 x 5.3 x 29mm
RS Stock No. 168-6045
Mfr. Part No.BD912
kr 11,856
Each (In a Tube of 50)
Units
PNP 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 Stock No. 169-3164
Mfr. Part No.BD912
kr 13,26
Each
Units
PNP 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 Stock No. 816-7794
Mfr. Part No.BF622
BrandNexperia
kr 3,278
Each (In a Pack of 20)
Units
NPN 50 mA 250 V SOT-89 Surface Mount 1.1 W - Single 250 V 5 V 100 MHz 3 1 4.6 x 2.6 x 1.6mm
RS Stock No. 545-0343
Mfr. Part No.MMBT3904LT1G
Brandonsemi
kr 1,133
Each (In a Pack of 50)
Units
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW - Single 60 V 6 V 300 MHz 3 1 0.94 x 2.9 x 1.3mm
RS Stock No. 145-2798
Mfr. Part No.BC560CG
Brandonsemi
kr 0,259
Each (In a Bag of 5000)
Units
PNP 100 mA 45 V TO-92 Through Hole 625 mW - Single 50 V 5 V 250 MHz 3 1 5.33 x 5.2 x 4.19mm
RS Stock No. 103-2948
Mfr. Part No.MMBT3904LT1G
Brandonsemi
kr 0,211
Each (On a Reel of 3000)
Units
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW - Single 60 V 6 V 300 MHz 3 1 0.94 x 2.9 x 1.3mm
RS Stock No. 170-3540
Mfr. Part No.MMBT3904LT3G
Brandonsemi
kr 0,174
Each (On a Reel of 10000)
Units
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW - Single 60 V dc 6 V 100 MHz 3 1 3.04 x 1.4 x 1.01mm
RS Stock No. 165-8564
Mfr. Part No.BF622
BrandNexperia
kr 1,64
Each (On a Reel of 1000)
Units
NPN 50 mA 250 V SOT-89 Surface Mount 1.1 W - Single 250 V 5 V 100 MHz 3 1 4.6 x 2.6 x 1.6mm
RS Stock No. 793-0753
Mfr. Part No.MMBT3904LT3G
Brandonsemi
kr 0,566
Each (In a Pack of 200)
Units
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW - Single 60 V dc 6 V 100 MHz 3 1 3.04 x 1.4 x 1.01mm
RS Stock No. 124-1357
Mfr. Part No.MPSA42
Brandonsemi
kr 0,97
Each (In a Bag of 1000)
Units
NPN 500 mA 300 V TO-92 Through Hole 625 mW - Single 300 V 6 V 50 MHz 3 1 5.2 x 4.19 x 5.33mm
RS Stock No. 761-3701
Mfr. Part No.MPSA42
Brandonsemi
kr 2,97
Each (In a Pack of 50)
Units
NPN 500 mA 300 V TO-92 Through Hole 625 mW - Single 300 V 6 V 50 MHz 3 1 5.2 x 4.19 x 5.33mm
RS Stock No. 781-5222
Mfr. Part No.SMMBT2222ALT1G
Brandonsemi
kr 1,069
Each (In a Pack of 100)
Units
NPN 600 mA 40 V SOT-23 Surface Mount 225 mW - Single 75 V dc 6 V 100 MHz 3 1 3.04 x 2.64 x 1.11mm
RS Stock No. 463-634
Mfr. Part No.MJE15032G
Brandonsemi
kr 14,176
Each (In a Pack of 5)
Units
NPN 8 A 250 V TO-220AB Through Hole 2 W - Single 250 V 5 V 30 MHz 3 1 9.28 x 10.28 x 4.82mm
RS Stock No. 803-1125
Mfr. Part No.BC550CTA
Brandonsemi
kr 1,119
Each (In a Pack of 200)
Units
NPN 100 mA 45 V TO-92 Through Hole 500 mW - Single 50 V 5 V 1 MHz 3 1 4.58 x 3.86 x 4.58mm
RS Stock No. 145-3904
Mfr. Part No.SMMBT2222ALT1G
Brandonsemi
kr 0,373
Each (On a Reel of 3000)
Units
NPN 600 mA 40 V SOT-23 Surface Mount 225 mW - Single 75 V dc 6 V 100 MHz 3 1 3.04 x 2.64 x 1.11mm
RS Stock No. 102-1375
Mfr. Part No.MJE15032G
Brandonsemi
kr 12,752
Each (In a Tube of 50)
Units
NPN 8 A 250 V TO-220AB Through Hole 2 W - Single 250 V 5 V 30 MHz 3 1 9.28 x 10.28 x 4.82mm